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4 min readExpert-reviewedUpdated 4 Jun 2026

Do I actually need all these supplements?

Half your shelf may be doing nothing for you.

Short answer

Most people do not need a cabinet of supplements, but genes like MTHFR (folate and B12 processing), VDR (vitamin D response) and FUT2 (B12 absorption) plus the Indian context of widespread vitamin D and B12 deficiency mean targeted supplements, guided by a blood test, often beat broad multivitamins.

Key takeaways
  • MTHFR, FUT2 and VDR influence folate, B12 and vitamin D handling.
  • Vitamin D and B12 deficiency are very common in India, even with sun.
  • Vegetarians are at higher risk of low B12.
  • Test your blood levels first; targeted supplements beat broad multivitamins.

Supplements are useful when you are genuinely low, and wasteful when you are not. Genetics affects who tends to fall short. The MTHFR gene shapes how you convert folate and B-vitamins into active forms; common variants are frequent in South Asians and can leave folate and homocysteine handling less efficient. The FUT2 gene influences vitamin B12 levels and gut bacteria. The VDR gene affects how your body responds to vitamin D once you have it.

The India angle is striking. Despite abundant sunshine, vitamin D deficiency is very common across Indian cities because of indoor lifestyles, pollution, skin pigmentation and clothing. B12 deficiency is also widespread, particularly among vegetarians, since B12 comes mainly from animal foods. So for many Indians, vitamin D and B12 are the supplements most likely to matter, while expensive antioxidant stacks often add little. Genes fine-tune the picture but do not replace measurement.

The honest takeaway: test, do not guess. A simple blood panel for vitamin D, B12 and iron tells you far more than any genetic test about what you actually need today. If you are deficient, targeted supplementation works well; if you are not, more pills rarely help and some, in excess, can harm. Spend on the one or two things your body is short of, not on the whole shelf.

People also ask

Do I need a multivitamin every day?

Most people with a varied diet do not. Targeted supplements for proven deficiencies like vitamin D or B12 are usually more useful than a daily multivitamin.

Does MTHFR mean I need special folate?

Some people with MTHFR variants are advised methylfolate, but for most, ordinary dietary folate and a normal blood result are enough; test before assuming.

Why am I vitamin D deficient in sunny India?

Indoor lifestyles, pollution, covered skin and pigmentation reduce vitamin D synthesis, so deficiency is common across Indian cities despite plentiful sunlight.

Sources
  • ICMR / Indian studies — high prevalence of vitamin D and B12 deficiency
  • Frosst P et al., Nature Genetics 1995 — MTHFR variant and folate metabolism
  • Hazra A et al., Nature Genetics 2008 — FUT2 and vitamin B12 levels

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