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Vitamin B12 deficiency is common in vegans and vegetarians because the body doesn't absorb it easily. Here's how much you actually need, and why.

Folic acid isn't just a pregnancy vitamin. Here's the UK reference intake, who needs more, and one real safety caution worth knowing.

Two nutrients genuinely differ by sex in UK guidance — iron and folic acid. Here's what actually changes, and what's mostly just marketing.