B12 Is Not the Only B Vitamin You Could Be Running Low On

B12 gets talked about because it is cheap and easy to test for. Folate, B6, and B1 run low in the same Indian diets, and almost nobody checks for those until something already feels off.

Think about a classroom for a second. There is always one student whose name the whole school knows, because that student has a report card everyone can point to. The other seven students in the same class might be working just as hard, but nobody is showing off their marks, so nobody talks about them. That is basically what has happened with vitamin B12 and the rest of its family.

Why does everyone know about B12 but nobody talks about the other B vitamins?

B12 is one vitamin out of a group of eight that all get labeled with the letter B and a number, B1, B2, B3, B6, B9 (also called folate), B12, and a couple of others. Doctors and lab tests focus on B12 so much that most people forget the other seven even exist. There is a simple reason for that. B12 has a standard blood test that almost every lab in the country can run, and the result comes back as one clean number. That makes it very easy for a doctor to check and very easy to explain to a patient. It is like the one subject in school that has a single, clear exam, so it is the one everyone quotes.

This attention is not completely misplaced either. B12 deficiency, meaning your blood levels of the vitamin have dropped below what your body needs, is genuinely very common in India. The main reason is that B12 is found almost only in animal foods, things like meat, fish, eggs, and dairy. Your body cannot make B12 on its own, and plants do not naturally contain it. India has a very large vegetarian population, so a big chunk of the country is eating a diet where the main source of this vitamin is missing or limited.

But here is the part that gets left out of the conversation. B12 did not become famous because it is the single most deficient nutrient in the country. It became famous because it is the easiest one to test for and the easiest one to put on a bottle label. The other B vitamins are doing important, unglamorous work in the background the whole time, and unglamorous work does not get a marketing budget.

So how common is B12 deficiency in India, really?

Very common. Reviews that pull together data from many different Indian population studies show B12 deficiency at extremely high rates. In some groups, seven or more out of every ten people tested came back low, and in one study, that number was true for more than two out of every three pregnant women tested. That is the statistic everyone has heard by now, and it deserves the attention it gets.

What almost nobody repeats, though, is that the same body of research keeps finding folate running low right alongside B12, in some of the exact same population groups.

Wait, so are folate, B6, and B1 actually low too, or is B12 the real problem?

Folate, also called vitamin B9, is another B vitamin, and the data on it is not small print. One study out of Maharashtra found folate deficiency in around forty percent of the adolescents tested. A separate study looking at a cohort of young children in Delhi found folate deficiency in more than sixty percent of them. And a different study focused on adolescents in North India found folate deficiency at a rate the researchers themselves flagged as a public health concern on its own, not as a side note underneath a B12 headline.

B6 and thiamine, which is the plain name for vitamin B1, get studied far less often than B12 or folate. That is worth sitting with for a second, because it is not the same as saying they are not a problem. One study looked at an apparently healthy group of urban adults, people who had no symptoms serious enough to send them to a doctor, and still found meaningful subclinical deficiency across several B vitamins beyond B12. Subclinical just means the deficiency was already there in the blood, without yet causing symptoms severe enough for the person to notice or complain about. Not checking for something is a bit like never checking the air pressure in your bicycle tyres. The tyre can be running low for weeks. You just will not know it until the ride gets noticeably harder.

A normal B12 test does not mean every other B vitamin in your body is fine too.

Why can't taking more B12 fix a folate or B6 problem?

Picture a sports team where every player has a different position. One player defends, one attacks, one keeps goal, and none of them can just swap in and do somebody else's job for a full match. The B vitamins work a lot like that. B12 and folate both play on what you could call the red blood cell team. They both help your body build new red blood cells and copy DNA correctly when cells divide, which is exactly why a shortage of either one can look similar on a blood test and sometimes gets mixed up with the other.

B6 is on a completely different team. It helps your body make neurotransmitters, which is the term for the chemical messengers your brain uses to manage things like mood and sleep. Thiamine, or B1, plays on the energy team. It helps your cells convert the food you eat into usable energy, which is part of why running low on it tends to show up as tiredness and odd nerve sensations, like tingling, rather than the blood-count changes you would see with a B12 or folate shortage.

This is exactly why a B12 supplement, whether that is a tablet, an injection, or a dissolve strip you place under your tongue, only ever corrects a B12 gap. A dissolve strip like the Real Dose B12 DISSOLVES strip works by melting on its own under your tongue, where the tissue is thin and full of tiny blood vessels, so the B12 gets absorbed straight into your bloodstream instead of having to travel through your stomach first. That is a genuinely fast and convenient way to get B12 into your system. What it is not, and what no B12 product in any format can be, is a fix for a separate folate, B6, or thiamine shortage running alongside it. If someone feels like a B12 shot or strip "did not work," the far more likely explanation is that it worked exactly as it was supposed to for B12, while a completely different gap kept causing the tiredness or low mood they were trying to solve.

Why doesn't the doctor just test for all of them at once, then?

Mostly, it comes down to what is quick and cheap to run. A single serum B12 test, meaning a blood test that measures B12 in the fluid part of your blood, is standardized and inexpensive, and almost any lab in the country can process it same day. Testing B6 or thiamine status properly usually needs more specialized assays, which is just the technical word for a lab testing method, and most routine health checkup panels do not include them at all. Doctors tend to order what is fast and easy to order, and patients tend to only ask about the vitamin they have already heard of on the news or in an ad.

There is a second reason too. The symptoms of B12, folate, B6, and thiamine deficiency overlap heavily with each other. Fatigue, irritability, trouble concentrating, and tingling in the hands or feet can all point to any one of these vitamins running low, and sometimes more than one is running low at the same time in the same person. When a B12 test comes back looking normal, the investigation very often just stops right there, even though nobody ever actually proved that B12 was the cause of the fatigue in the first place. The test ruled out one suspect. It did not clear the other three.

Does Indian cooking make any of this worse?

It genuinely can. Refined grains, polished rice, and long cooking times all strip B vitamins out of food before it ever reaches your plate. Thiamine is a good example of why. It is water-soluble, which means it dissolves into water the way sugar dissolves into hot tea, and it is heat-sensitive, meaning heat breaks it down. Boiling and pressure-cooking, both extremely common in Indian kitchens, can meaningfully reduce the amount of thiamine that survives into the final dish.

Folate has a similar problem. It gets destroyed by prolonged cooking, and leafy greens, which are one of the best natural sources of folate, are often cooked well past the point where the vitamin inside them can survive. None of this means every single person needs to start taking a B complex supplement tomorrow. It means the public conversation around B vitamin gaps in India has narrowed down to talking about one letter of the alphabet, while the actual research keeps pointing at a wider gap running across several letters at once.

So what should you actually do with all of this?

Testing for B12 specifically is still worth doing, given how common the deficiency is across the country. And treating a confirmed B12 gap directly, at a dose that is actually high enough to matter, is well supported by the evidence available. Nothing here is trying to talk you out of taking B12 seriously.

The mistake is assuming a normal B12 result closes the whole case. A normal B12 number tells you about B12. It does not tell you anything about your folate, B6, or thiamine levels, because those were most likely never checked at all in the same panel. If fatigue, low mood, poor concentration, or that tingly feeling in your hands or feet sticks around even after your B12 comes back fine, that is a good moment to ask your doctor about testing the rest of the B family, rather than concluding that nothing nutritional is going on and giving up on the question entirely.

FAQ

Why does India specifically have such high rates of B12 deficiency compared to other countries?

It comes down to diet more than anything else. B12 is naturally present almost only in animal foods like meat, fish, eggs, and dairy, and a very large share of India's population eats a vegetarian or low-meat diet. Population studies from across India consistently find B12 deficiency at rates well above what shows up in most Western countries, where diets typically include more animal products.

I have never had my folate or B6 checked. Should I actually be worried, or is that just for people with symptoms?

The data suggests it is worth paying attention to even without obvious symptoms. Studies have found folate deficiency at rates similar to, or in some groups higher than, B12 deficiency, especially in adolescents and young children. B6 and thiamine show up less often in research simply because they get tested less often, but the studies that do exist still point to real, measurable gaps in people who otherwise looked healthy.

My B12 test came back completely normal. Does that mean my vitamin levels are fine overall?

Not necessarily. A normal B12 result only confirms that one specific vitamin is in a healthy range. Folate, B6, and thiamine are almost always tested separately, and routine checkup panels frequently skip them entirely. If you are still dealing with fatigue or similar symptoms after a clean B12 report, it is reasonable to ask your doctor whether the rest of the B vitamin family should be looked at too.

Does the way food is cooked in Indian households really destroy enough B vitamins to matter?

Cooking method does play a real role. Thiamine breaks down with heat and dissolves away in water, so boiling and pressure-cooking, two very common techniques in Indian kitchens, can noticeably lower how much of it survives into the final meal. Folate behaves the same way and is easily lost when leafy greens are cooked for longer than necessary. This does not automatically mean every household needs to supplement, but it does explain part of why these gaps show up so often in the research.

Sources

• Indian Journal of Medical Research: Micronutrient status of Indian population
• European Journal of Clinical Nutrition: Unravelling folate deficiency, prevalence and determinants in adolescent health in North India
• Nutrition Journal: Prevalence of vitamin deficiencies in an apparently healthy urban adult population, assessed by subclinical status and dietary intake

Science. Simplicity. No BS.