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Everything here is reference information drawn from the research literature, not medical advice, and Lamduan is neither a doctor nor a pharmacist. Supplements are not medicines and do not replace anything a doctor has prescribed. If you take regular medication, are pregnant or breastfeeding, have liver or kidney disease, or have surgery coming up, speak to a pharmacist or doctor before starting anything on this page.
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Tap a name for all six answers. Every answer carries a badge saying how strong the evidence is, and where the marketing does not match the research, it says so plainly.
A vitamin found only in animal foods, needed to build red blood cells and the sheath around nerves.
🎯What it helps withStrong evidence
Correcting deficiency — common in vegetarians, older people, and long-term users of acid blockers or metformin. In people who are not deficient it gives no extra energy.
⚗️Effect on hormonesNo human data
No hormonal effect.
Weight and fat lossNo human data
Nothing to do with fat loss. B12 injections for weight loss have no evidence behind them.
🌙SleepNo human data
Nothing to do with sleep.
❤️Other health effectsStrong evidence
Blood and nerves. Prolonged deficiency causes permanent spinal cord damage.
📏Dose and ceiling
Commonly used: 500-1,000 mcg per day
No limit from IOM or EFSA — no adverse effects at any oral dose, and absorption is self-limiting anyway.
Caution
Almost risk-free. The thing to know: if you take high-dose folic acid while B12 is low, the folate masks the anaemia while the nerve damage quietly continues.