So here’s what hair vitamins are supposed to do: revamp your hair from the inside out with a mix of ingredients, like biotin; folic acid; vitamins D, A, C, and . The problem however is that supplements and vitamins are not FDA-regulated, meaning brands can say and do whatever they want about them. In general, what you will here is that, after a few months of taking these vitamins, your hair is supposed to look longer, healthier, shinier, and stronger, and your scalp’s oil production can speed up or slow down, depending on which brand and type you try (Cosmopolitan, 2020).

The thing is, because these pills aren’t backed by government-approved data and there isn’t really a uniform set of ingredients, strengths, or formulations across brands, there’s never going to be a straight yes or no answer as to whether hair supplements work. But if you ask experts, their answer is pretty much a big NOPE (Cosmopolitan, 2020).

Even if you ingest triple the vitamins your body needs, you won’t actually reap triple, or even double, the hair growth rewards. “Your body keeps only the vitamins it needs and then gets rid of the rest,” says Burg. Kind of like pouring water into a glass that’s already 100 percent full. So unless you’re actually missing some key nutrients, you’ll likely end up peeing out the excess pretty soon after you ingest them (Cosmopolitan, 2020)

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