Vitamin B12 is the one vitamin the plant half of a vegetarian plate cannot supply. Dal, roti, rice, sabzi, fruit, nuts: none of them carry it. It is made by bacteria and reaches us through animals: meat, fish, eggs, milk and what is made from milk. If your plate is vegetarian, most of your B12 is coming from the milk in your chai and the curd with your lunch. If your plate is vegan, it is coming from nowhere.
Why the Indian plate runs short
A large share of Indians are vegetarian, and many of the rest eat meat rarely. The Indian dietary guidelines list B12 as a nutrient of concern for vegetarians and note, dryly, that milk has a small amount. A glass of milk gives roughly one microgram. A katori of curd gives less. Paneer a little more. Most days a vegetarian plate falls short, and the shortfall adds up quietly over years. The same guidelines put low B12 at roughly one in seven small children and close to one in three teenagers, and that is before adult life.
Absorption falls with age, so the same thali gives a sixty-year-old less than it gave them at thirty. And some long-term medicines, including common ones for acidity, lower how much B12 you take up from food. If you take those, mention it to your doctor.
The liver stores years of B12, which is why a shortfall goes unnoticed for so long and why it takes months of steady intake to refill.
The number: 2.2 micrograms
The ICMR-NIN recommended dietary allowance for adults, revised in 2020, is 2.2 micrograms a day. The average requirement is 2 mcg.
Under FSSAI rules a health supplement may not carry more than one RDA of any nutrient, and the regulator's own FAQ says that RDA, one RDA and 100 percent RDA mean the same thing. So the B12 line on a compliant Indian supplement label reads 2.2 mcg, and the percent column reads 100 percent. That is the number to look for.
It sounds too small to matter. Absorption is why it is not. Your gut takes up B12 in two ways. The first is an active route that grabs roughly 1.5 to 2 mcg per meal and then stops, however much is on the plate. The second is plain diffusion, which lets through roughly one percent of whatever is there. So a 2.2 mcg dose, taken every day, gives you roughly half of it, and the RDA is set with that in mind. A 1,500 mcg tablet gives you the same 2 mcg by the first route and roughly 15 mcg by the second. The rest leaves in the urine.
That is why the big numbers exist, and who they are for. In India, 500 and 1,500 mcg B12 tablets are pharmacy medicines, sold under drug rules, and on the vegetarian forums they are the default answer to a low test result. That is a doctor's tool for refilling an empty store, and a doctor should set the dose and the length. A health supplement is meant to top up a normal diet, not to fix a shortfall a doctor has found. If a pack sold as a HEALTH SUPPLEMENT shows 500 mcg, it is an import, a pharmacy product in the wrong costume, or a brand that has not read the rule.
Methylcobalamin versus cyanocobalamin
Read the word after "vitamin B12" on the label. It will be one of two.
Cyanocobalamin is the older, made-in-a-factory form. It is stable, cheap, well studied, and the body converts it into the forms it uses. The cyanide in the name is a trace, less than some foods carry.
Methylcobalamin is one of the two forms the body actually works with. It skips the conversion step. It costs a little more and it is sensitive to light, which is why it belongs in an opaque bottle or a foil strip.
The honest position: both raise blood levels in most people. The evidence that methyl is better for everyone is thinner than the marketing. We use methylcobalamin because it is the form the body uses, and at 2.2 mcg the difference in cost is close to nothing. What matters more than which form is that the label states the form at all, and next to it, a number.
Either way, the B12 in a capsule was made by bacteria in a tank, not by an animal, so a green dot on a B12 pack is honest as long as the shell is vegetarian too.
What a label should show
The line should read something like: Vitamin B12 (as methylcobalamin), 2.2 mcg, 100 percent RDA. Not "vitamin B12 complex". If B12 sits with folate, B6 and the rest, each one needs its own amount and its own percent.
The other-ingredients line matters too. A tablet that dissolves under the tongue usually carries sweeteners and flavours; a capsule usually does not. Neither is wrong. Both should be printed.
The honest timeline
Blood levels rise within weeks of steady daily intake. How you feel is slower and less certain, because the store refills first. Give it three months, and judge by a blood test rather than by mood. Many people notice nothing at all, because they were never short in the first place and the capsule was insurance. That is a fine reason to take it.
If you are tired all the time, have pins and needles in the hands or feet, or a sore tongue, that is a reason to get tested, not a reason to buy a bottle. A serum B12 test costs roughly a thousand rupees at a city lab. Forum threads that open with a low number and ask which brand to buy have the order wrong. The first question is which dose and for how long, and it belongs to a doctor.
The milk in your chai counts, a little. The cups it would take to reach 2.2 mcg are not worth chasing. A capsule is cheaper than the chai.
What to check on your label
- The form, methylcobalamin or cyanocobalamin, written out.
- The amount per serving in mcg, on its own line, not inside a blend.
- The percent RDA against the Indian figure of 2.2 mcg: 100 percent on a health supplement, not 5,000.
- The category word in capitals next to the name (HEALTH SUPPLEMENT, NUTRACEUTICAL or PROBIOTIC FOOD) and NOT FOR MEDICINAL USE, which say which rules the pack follows.
- An opaque bottle or a foil strip, since methylcobalamin dislikes light.
- The other-ingredients line, short enough to read aloud.
- The FSSAI licence number, the green dot, and the lot number on the pack.
Then read ours the same way: see the label
