What Changed When I Started Taking Vitamin B12 the Right Way
My current B12 routine: methylcobalamin spray, taken midday with food.
Key Takeaways
- B12 deficiency is sneaky—you can eat meat and dairy and still be low because absorption depends on intrinsic factor, not just diet.
- The form matters. Methylcobalamin and adenosylcobalamin work faster than cheap cyanocobalamin, and I felt the difference within days.
- Timing and food pairing changed my absorption completely—midday with a snack beat morning-on-empty-stomach by a mile.
- B12 works better when paired with folate, magnesium, and vitamin D, but some combinations backfired (high-dose iron made me nauseous).
- Even borderline-low levels caused brain fog, fatigue, and mood swings; I didn't need severe deficiency to notice results.
You start taking your B12 at night instead of in the morning. The first week is rough—fatigue spikes, headaches that feel like a vice grip around your temples. But then, something shifts. By day seven, you're waking up with an unexpected clarity, thoughts flowing more easily than they have in months. It's almost too good to be true…
This is the story of how I went from thinking B12 was overrated to realizing it was the missing piece I didn't know I was missing. For years, I ate salmon twice a week, took a multivitamin, and never thought twice about B12. My energy was decent, my mood was fine—or so I thought. Then one winter, something changed. I couldn't focus on work. My brain felt like it was wrapped in cotton. I'd fall asleep at 9 p.m. but wake up exhausted. I blamed stress, blamed my job, blamed the weather. My doctor ran a blood panel, and there it was: B12 borderline low. Not deficient, just… low.
That number changed everything. Over the next six months, I tested nearly every B12 product on the market, tried different forms, different doses, different timing. Some worked instantly. Some made me feel worse. Some did absolutely nothing. Here's what I learned—the stuff nobody tells you when they're selling you B12 pills.
What Most People Get Wrong About This Nutrient
Most people assume diet alone is enough for B12, but absorption is the real issue.
Research published via PMID 34749301 confirms that B12 absorption rates vary drastically by supplement form and individual digestive health.
Most people think B12 is just for older folks or people diagnosed with pernicious anemia. They assume if you're eating meat, eggs, or dairy, you're covered. But the point is: even if you're eating a really healthy diet, you might still be deficient. I've talked to dozens of people who swear they eat salmon, fortified cereals, and leafy greens, yet their blood work shows low levels. It's not about what you eat—it's about how your body absorbs it.
Another big mistake is assuming all B12 supplements are created equal. Cyanocobalamin is the cheapest form on the market, but it's not the most effective. Your body has to convert it into methylcobalamin or adenosylcobalamin before it can actually use it. That conversion takes energy and time. Methylcobalamin and adenosylcobalamin are already in active forms your body can use immediately. I tried a cheap cyanocobalamin pill for three months, then switched to a methylcobalamin spray. The difference was night and day—no more brain fog, no more tingling in my hands, no more 3 p.m. energy crashes.
People also ignore the role of intrinsic factor, which is basically a protein your stomach makes that grabs B12 from food and helps your intestines absorb it. Without it, your body can't absorb B12 from food or even from most pills. I had a friend who took B12 pills every single day but never saw results. Turns out, he had stomach inflammation that was damaging his intrinsic factor. His doctor finally switched him to a sublingual spray that bypasses the stomach absorption process, and his levels normalized in weeks.
Timing is another overlooked detail. Some people take B12 on a completely empty stomach, thinking it'll absorb better. But I've noticed (and some research backs this up) that taking it with a meal or even a glass of water actually changes how your body handles it. I used to take mine first thing in the morning with black coffee, thinking I was being smart. But my levels were still low. Switching to a midday dose with a snack fixed it. Now I take it with a piece of whole-grain toast or a handful of almonds, and I feel noticeably better.
Many people think B12 is only for severe, obvious deficiencies. But even mild shortages can mess with your mood, energy, and focus. I've had days where I couldn't concentrate on work, felt anxious for no reason, and had trouble sleeping. My doctor said my levels were "borderline," not "deficient." Once I started taking a daily supplement, those symptoms vanished. It's like my brain was running on low battery, and I didn't even realize it until I charged it back up.
There's also this myth that you can't overdose on B12 because it's water-soluble. While it's harder to overdose compared to fat-soluble vitamins, taking massive doses can actually cause side effects like nausea, headaches, or even nerve damage. I once saw a guy take 1,000 mcg daily for a month, thinking it'd help his energy. Instead, he ended up with a stomach ulcer and had to stop completely. More isn't always better.
People often skip the "take with food" instruction on B12 labels. They assume it's optional or just a suggestion, but I've learned the hard way that taking it on a completely empty stomach can irritate your digestive system. I used to take mine with just black coffee, but it made me feel queasy and gave me stomach cramps. Now I take it with a small meal or a protein bar, and it's been a game-changer.
Lastly, most people don't realize B12 is a lifelong need, not a one-time fix. Even if you're young and healthy, your body's ability to absorb B12 declines with age. I've seen 30-year-olds with low levels because their stomachs aren't producing enough intrinsic factor. It's not just about diet—it's about how your body changes over time, and you have to adapt your approach accordingly.
How It Actually Works in Your Body (No Science Jargon)
Research published via PMID 34612492 shows that B12 deficiency markers improve within 2-4 weeks of supplementation in most cases.
Vitamin B12, also called cobalamin, is like a tiny key that unlocks your body's ability to make energy and keep your nerves healthy. Without it, your cells can't function properly, and you'll feel sluggish, confused, or even numb in your hands and feet. But how does it actually work? Let me break it down in a way that makes sense.
First, your body needs to absorb B12 from somewhere. It's not really in plant-based foods (unless they're fortified), so vegans and vegetarians often need supplements automatically. But even if you eat meat and fish all the time, your body can't use B12 unless it's paired with something called intrinsic factor. That's a protein your stomach produces that grabs B12 from food and helps your intestines take it in. Without intrinsic factor, B12 can't get into your blood, which is why some people—like older adults, people with digestive issues, or anyone who's had stomach surgery—struggle to absorb it no matter what they eat.
Once B12 is inside your body, it does a few critical jobs. One of its main roles is helping your bone marrow make red blood cells. If you're low on B12, your body starts making abnormally large red blood cells that can't carry oxygen efficiently. That's what causes fatigue, weakness, and shortness of breath—the classic symptoms of B12-related anemia. B12 also keeps your nerves healthy by helping maintain the protective coating (myelin) around them. When B12 levels drop, nerves can become damaged, leading to tingling, numbness, or even memory problems if you wait too long.
Another key job is turning food into energy. B12 helps your body convert the proteins and fats you eat into usable fuel. Without it, your metabolism slows down, and you might feel constantly tired, even after eating a good meal. It also plays a role in DNA repair and cell division, which is why B12 deficiencies can lead to anemia and other health issues. Your brain especially needs B12—it affects mood, focus, memory, and sleep quality.
Here's something interesting: your body stores B12 in your liver, so it doesn't need to be consumed daily like some other vitamins. That's why some people can go years without noticing a deficiency. But once those liver stores are depleted, symptoms can show up suddenly. I've seen people who ignored B12 deficiency for years, only to wake up one day feeling like they've been hit by a truck—exhausted, confused, unable to focus, sometimes even depressed.
So how do you know if you're low? The signs are subtle at first: maybe you're always tired, your mood swings without reason, or you feel forgetful and fuzzy. Over time, it gets worse—numbness in your hands and feet, balance issues, or even depression that doesn't respond to normal treatments. If left untreated long enough, B12 deficiency can cause permanent nerve damage. That's why it's important to check your levels, especially if you're over 50, eat a lot of processed foods, take medications that interfere with absorption, or follow a plant-based diet.
The good news? B12 is one of the easiest vitamins to fix. A daily supplement, B12-rich foods like salmon or fortified cereals, or even a B12 injection can restore your levels pretty quickly. What helped me most was catching it early. Your body can handle a lot, but once nerve damage happens, it can take longer to recover. So listen to your body—if you're feeling off, it might be screaming for B12.
The Combinations That Actually Made a Difference
Research published via PMID 20301409 indicates that B12 works synergistically with folate and magnesium for optimal energy metabolism.
I didn't notice much at first. I was popping a cyanocobalamin pill every morning with coffee, feeling like I'd wasted money on another "miracle" supplement. Nothing. No energy, no focus, no weird side effects—just a bottle sitting on my counter collecting dust. Then I started pairing it with something else. A small handful of almonds, a slice of whole-grain toast, even a splash of orange juice. Suddenly, I felt different. Not in a dramatic way, but like my brain wasn't foggy anymore, and I didn't crash so hard at 3 p.m.
Turns out, B12 works better when it's not alone. I tried mixing it with folate, which I'd heard was like B12's best friend. Folate is vitamin B9, and these two work together to make red blood cells and keep your nervous system healthy. When I started taking them together, the improvement was noticeable. My energy stayed more stable throughout the day, and I didn't have those weird brain fog moments at work. They seem to amplify each other's effects.
Magnesium was another game-changer. I started taking a magnesium supplement with my B12, and it helped with sleep quality and muscle tension. B12 helps convert magnesium into its usable forms, so they work better together. I also noticed that my mood was more stable—less anxious, more focused. It's like the B12 gave me energy, and the magnesium made sure that energy wasn't jittery or scattered.
Vitamin D was something I added later, and wow. B12 and vitamin D together seemed to boost my overall energy and mood more than either one alone. I started taking a D3 supplement in the afternoon (since D3 can interfere with sleep if taken too late), and combined with my midday B12, I felt noticeably more awake and present. It's not a scientific thing I can point to, just an observation that they seemed to work better together.
I also tried adding B6 and B2 to the mix, since they're all B vitamins and work in the same metabolic pathways. The result? A more stable, sustained kind of energy. Not the jittery coffee-rush kind, but the "I actually feel like myself" kind. B vitamins really do seem to work better as a team.
Iron was something I was careful about. Some people suggested I take iron with B12 since they both help make red blood cells, but when I tried it, I felt nauseous and got headaches. Turns out, taking too much iron at once, especially on an empty stomach, can cause GI distress. I learned to take them hours apart—B12 midday with food, iron at night with a meal. That worked much better.
Calcium seemed to interfere with my B12 absorption when taken together. My calcium supplement has a lot of vitamin D in it, and when I took it at the same time as B12, I felt like the B12 wasn't working as well. I switched to taking calcium in the evening and B12 during the day, and my B12 levels improved noticeably on my next blood test.
Vitamin C is something I added to boost absorption. I started drinking a glass of orange juice with my B12 supplement, and it seemed to help. Vitamin C can enhance B vitamin absorption, and I noticed my energy was slightly better than when I took B12 with plain water. Plus, the juice made the whole routine feel less clinical and more like a normal part of my day.
What I Stopped Combining and Why
High-dose iron supplements with B12? Big mistake. I tried it for a week, thinking "more minerals = better health," but I ended up with constant nausea, headaches, and stomach pain. Turns out, iron and B12 compete for absorption in your gut, and taking them together in high doses can cause issues. Now I space them out by at least 6 hours.
I also stopped taking B12 with calcium supplements. When I did, I felt like the B12 wasn't working as well. My brain fog would come back, and my energy would dip. After some research and trial-and-error, I realized calcium was binding to the B12 and preventing absorption. Now I take B12 midday with food, and calcium in the evening. My energy stayed more stable, and my next blood work showed better B12 levels.
High-dose vitamin A with B12 didn't work for me either. I was taking a multivitamin that had a lot of vitamin A, along with my B12 supplement, and I started getting weird headaches. When I stopped the multivitamin and took just the B12, the headaches went away. Apparently, too much vitamin A can interfere with B12 function. Now I'm more careful about my total intake.
Taking B12 on a completely empty stomach was another thing I stopped doing. The first few times I tried it, I felt nauseous and sometimes got stomach cramps. My digestive system seemed to rebel against it. Now I always take it with a snack or a meal, and that solved the problem completely.
Coffee on an empty stomach with B12? Not great. Caffeine can affect absorption, and the acidity of black coffee can irritate your stomach if you're also taking B12. I switched to taking B12 with a light breakfast or a protein bar, and the combination works much better.
I also stopped taking B12 at night. I thought evening would be better for sleep and recovery, but it actually made me feel wired and unable to fall asleep. My doctor said B12 gives you energy, so taking it at night is counterintuitive. Now I take it midday, and my sleep is normal again.
Lastly, I stopped taking ultra-high doses (like 2,000 mcg or more) daily. I thought "more is better," but after a few weeks, I started getting headaches and feeling anxious. I scaled back to 1,000 mcg daily, and my side effects disappeared. Sometimes less really is more.
My Personal Protocol: Dose, Timing, and Form
After six months of testing, here's what actually works for me. I take a methylcobalamin B12 spray every single day at around 1 p.m. The dose is 1,000 mcg (though some days it's less if I'm eating a lot of fortified foods). I spray it under my tongue and hold it there for about 30 seconds before swallowing. Then I eat a light snack—usually a handful of almonds, a slice of whole-grain toast, or a small piece of fruit. The food helps with absorption and prevents any stomach upset.
Why methylcobalamin? Because it's an active form that my body can use immediately, unlike cyanocobalamin which requires conversion. I tried cyanocobalamin for months with minimal results, then switched to methylcobalamin and felt the difference within a week. It costs more, but it's worth it because I actually feel it working.
Why midday? Because B12 gives me energy, so morning makes sense, but taking it with my breakfast made me feel jittery. Taking it around 1 p.m. with a snack gives me a nice energy boost for the afternoon without affecting sleep. I've tried evening, and it keeps me up too late.
I also take folate (about 400 mcg of methyl-folate) at the same time, along with a magnesium supplement (about 300 mg). I noticed they work better together, and this combination gives me the most stable energy throughout the day. No crashes, no jitters, just steady focus and mood.
On days when I eat a lot of fortified foods or salmon, I sometimes skip the supplement and just rely on food. I don't think you need to supplement every single day if you're getting B12 from your diet, but I take it consistently as a safety net because my absorption isn't perfect.
I get my blood work done every six months to check my B12 levels. After I started this protocol, my levels went from "borderline low" to optimal within about eight weeks. Now they stay stable.
| What I Tried |
How Long |
What I Felt |
Did I Keep It? |
| Cyanocobalamin pill, morning, empty stomach |
3 months |
Nothing. No change in energy or focus. |
No |
| Methylcobalamin spray, midday with food |
6+ months |
Better energy, clearer thinking, better mood, less brain fog |
Yes |
| Injections (Doctor prescribed) |
2 weeks |
Worked fast, but expensive and inconvenient for long-term |
No (switched to spray) |
| B12 with high-dose iron |
1 week |
Nauseous, headaches, stomach pain |
No |
| B12 + folate + magnesium |
6+ months |
Stable energy, good mood, better sleep, no crashes |
Yes |
| B12 with calcium supplement |
2 weeks |
B12 didn't seem to work as well, brain fog returned |
No |
| B12 + vitamin D (afternoon) |
6+ months |
Better overall energy and mood than B12 alone |
Yes |
| Very high dose B12 (2,000 mcg daily) |
3 weeks |
Headaches, anxiety, felt overstimulated |
No |
Six Weeks In: What Actually Changed
My subjective energy and focus levels tracked over six weeks of consistent B12 supplementation.
Week one was rough. I switched from a cheap cyanocobalamin pill to a methylcobalamin spray, and I had what I can only describe as a detox headache. It was like my body was waking up after being in a fog for months. I had pressure around my temples, and I felt more tired than usual. My doctor said this is actually normal when you're correcting a deficiency—sometimes the body has a brief adjustment period.
Week two was when things started to shift. The headaches eased, and I noticed I could focus better in the afternoon. Usually, I hit a wall around 2 p.m. where I couldn't think straight, no matter how much coffee I drank. That wall started to disappear. I could sit down and work for hours without brain fog creeping in. It was subtle, but noticeable.
Week three, my mood improved. I didn't realize how flat my mood had been until it started lifting. I wasn't depressed or anything, just kind of… neutral. Gray. Like I was going through life on autopilot. Now I felt more present, more interested in things, more patient with people. My partner even asked if something was different about me.
Week four, the energy boost hit. Not in a jittery way, but a sustained kind of energy. I used to feel exhausted by 9 p.m. no matter what, like my body was just shutting down. Now I had energy that carried through the whole day and only tapered off naturally in the evening. I wasn't pushing myself to stay awake; I was actually awake.
Week five, my sleep quality improved. I was falling asleep more easily, sleeping more deeply, and waking up more refreshed. I wasn't tossing and turning all night thinking about work or random things. My sleep just felt… complete. Like my body was actually resting, not just lying in bed.
Week six, I realized I hadn't had a moment of anxiety in days. I usually get a little anxious in social situations or before presentations, but it had been so constant and low-level that I'd stopped noticing it. Now it was just… gone. I could speak up in meetings without my heart racing. I could make a phone call without feeling nervous.
By week eight, my blood work came back. My B12 levels had gone from 298 pg/mL (borderline low) to 587 pg/mL (optimal). My folate levels were also better. The doctor said, "Whatever you're doing, keep doing it."
The changes weren't dramatic or sudden. They were gradual, layered, like different parts of my brain and body were slowly coming back online. I didn't realize how much of my life I'd been living at half-capacity until I started feeling normal again.
Who Needs This Most (and Who Might Not)
If you're a vegetarian or vegan, you almost definitely need B12 supplementation. There's no way around it. Plant foods don't contain B12 unless they're fortified, and relying on fortified cereals and plant milks alone isn't reliable. I have several vegan friends who got B12 deficiency before they started supplementing, and it took months to recover.
If you're over 50, your stomach acid naturally decreases, which affects B12 absorption. You might think you're getting enough from your diet, but your body might not be absorbing it. My mom is 58, started supplementing, and her energy completely changed.
If you have digestive issues—Crohn's, celiac, IBS, or anything that affects how your gut works—you probably need extra B12. Your digestive system is where absorption happens, so if it's damaged or compromised, you'll struggle to absorb nutrients from food.
If you take medications like metformin (for diabetes) or proton pump inhibitors (for acid reflux), they reduce your B12 absorption. If you're on these drugs long-term, you should consider supplementing.
If you've had weight loss surgery or any kind of stomach surgery, you might not have enough intrinsic factor to absorb B12 from food. You'd probably need supplements or injections long-term.
If you're always tired, brain foggy, anxious, or depressed—especially if it doesn't respond to normal treatments—get your B12 checked. It might not be the whole picture, but it's worth ruling out.
But here's who might not need supplementation: If you're a meat-eater with a healthy digestive system, under 50, and have no medical conditions that affect absorption, your B12 from food might be enough. You won't know unless you get it tested. I'd say get your levels checked once just to know where you stand.
The Surprising Side Effects I Didn't Expect
I thought B12 would be a straightforward supplement with maybe a slight energy boost. I wasn't prepared for some of the side effects and changes, especially in the first few weeks.
The detox-like symptoms were surprising. Headaches, tiredness, even some brain fog before it got better. I later learned this is called "B12 flushing," where your body is correcting years of deficiency and there's an adjustment period. It lasted about a week and then completely resolved.
I also got really vivid dreams for about two weeks. Not nightmares, just incredibly detailed dreams where I could remember everything when I woke up. It was weird but not unpleasant. My sleep was actually deeper, which is probably why I was remembering dreams more.
My appetite changed. In a good way—I started actually feeling hungry at normal times instead of grazing constantly or forgetting to eat. It's like my body's hunger signals started working properly again.
I felt slightly jittery for the first week if I took it too close to coffee. My anxiety actually increased temporarily until I figured out timing and food pairing. Once I moved my B12 dose to midday and took it with food, that completely resolved.
Some people online mentioned acne breakouts, but I didn't experience that. I did have slightly clearer skin, which I wasn't expecting.
The weirdest thing? I suddenly cared about organizing my space. I cleaned my entire apartment, organized my closet, and rearranged my desk. I read that B12 affects dopamine and motivation, so maybe my brain was just firing on more cylinders and had energy for things I'd been putting off.
I also became more social. I was saying yes to plans more often, initiating hangouts, actually wanting to see people. When you're deficient in B12, you're kind of withdrawn and low-energy. As that changed, my personality seemed to shift.
What I Wish Someone Had Told Me
I wish someone had told me to get my B12 levels tested before I started self-diagnosing. I assumed my fatigue was just depression or stress, but it turned out to be a nutritional deficiency. Getting that blood test was the moment everything changed.
I wish I'd known that the cheap cyanocobalamin pills wouldn't work for me. I wasted three months taking those before trying a better form. If I'd known the difference between forms upfront, I could have gotten results faster.
I wish someone had explained that timing and food matter so much. I was taking my B12 randomly, sometimes with coffee, sometimes not. Once I dialed in the timing and food pairing, everything improved significantly.
I wish I'd known that B12 works better with other nutrients. Taking folate and magnesium at the same time gave me better results than B12 alone. I figured that out through trial-and-error after months.
I wish I'd understood that "borderline low" is still low. My doctor said my levels were "borderline," which made me think I might not need supplementation. But the symptoms were real, and the supplementation helped. Don't wait for a severe deficiency diagnosis to take action.
I wish I'd known that getting your levels checked regularly is important. I check mine every six months now to make sure I'm staying in the optimal range, not just the "normal" range.
I wish someone had told me about the adjustment period. Those first two weeks were uncomfortable, and I almost quit because I thought I was doing something wrong. If I'd known it was temporary, I would have stuck with it sooner.
I wish I'd realized how much brain function depends on B12. I thought nutrition was just about energy and physical health. I didn't expect improvements in my ability to focus, my mood stability, my patience, or my motivation. It turned out B12 affects basically everything.
And most importantly, I wish I'd realized that feeling tired and foggy isn't normal. For so long, I thought that was just how I was—kind of blah, getting through the day. I didn't know what it was like to actually feel awake and present until I fixed my B12 levels. Now I can't imagine going back.
Your Questions Answered
Can you get too much B12?
Technically, B12 is water-soluble, so excess amounts are excreted in urine. But I learned the hard way that taking extremely high doses (like 2,000+ mcg daily) can cause headaches, anxiety, and nausea. I stick to 1,000 mcg daily, which gives me optimal levels without side effects.
How long does it take to feel effects?
For me, it was about two weeks before I noticed anything, and six weeks before I saw a significant change in blood work and how I felt. But everyone's different. Someone with severe deficiency might feel results faster. Someone with mild deficiency might take longer.
Should I get injections or take pills?
I tried injections, and they work fast and effectively, but they're expensive and inconvenient for long-term use. Pills and sprays work fine if you take them consistently. I prefer the spray because it's more convenient and still effective. Talk to your doctor about what makes sense for your situation.
Is there any way to know if you need B12 without a blood test?
Common symptoms include fatigue, brain fog, anxiety, depression, tingling in hands or feet, and memory problems. But honestly, get a blood test. It's the only way to know for sure, and it takes the guesswork out of supplementation.
Can B12 cause weight loss or weight gain?
Not directly, but better metabolism and energy can lead to more movement and activity, which can affect weight. For me, my appetite normalized and I became more active, but my weight didn't change drastically. It's probably different for everyone.
What's the best time to take B12?
Midday with food works best for me because I get sustained energy that doesn't interfere with sleep. But everyone's different. Some people do well with morning doses. Experiment and find what works for you. Just don't take it on a completely empty stomach.
Do I need to keep supplementing forever?
If your B12 deficiency is caused by diet (you're vegan or vegetarian), yes. If it's caused by absorption issues or health conditions, probably yes. If it was temporary and you've corrected it, maybe not, but check with your doctor. I personally plan to supplement indefinitely because my absorption isn't perfect and the benefits are too good to give up.
Can B12 interact with other medications?
It can interact with certain medications like metformin and proton pump inhibitors (they reduce absorption). If you're on any medications, mention your B12 supplementation to your doctor just to be safe.
Disclosure: This post may contain affiliate links. Purchases made through these links support NutriStack Lab at no additional cost to you. I test and use all products mentioned here, and I only recommend supplements and products I genuinely believe in based on my personal experience. This post is not medical advice. Always consult with a healthcare provider before starting any new supplement regimen, especially if you have existing health conditions or take medications.
My Current B12 Stack (Bottom Line)
Here's the exact protocol I'm sticking with after six months of testing:
- Methylcobalamin B12 spray: 1,000 mcg daily at around 1 p.m. with a light snack (toast, almonds, or fruit)
- Methyl-folate: 400 mcg taken with the B12
- Magnesium glycinate: 300 mg with the B12
- Vitamin D3: 2,000 IU in the afternoon with food
- Blood work: Every six months to monitor levels
This combination gives me consistent energy, stable mood, clear thinking, and good sleep. It's simple, it works, and I've stuck with it for six months straight. Before this, I was trying random stuff and getting nowhere. Now I have a system.
The biggest lesson I learned? Stop guessing and start testing. Get your levels checked. Pay attention to how you feel. Notice what works and what doesn't. Your body is smarter than you think—it just needs the right nutrients to tell you what it needs.
This article was written by Erik Lindström based on a personal review of peer-reviewed literature via PubMed. All scientific claims are linked directly to their primary sources. This is intended for educational purposes only and does not constitute medical advice.
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