Author: Ugnė Kurkytė

You lost the weight. You felt good about it. And then three months later your hair started coming out in the shower.

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You started collagen a few weeks ago. Now the scale’s moved, and you’re wondering if the powder’s to blame.

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Most hair nutrients are a story about not getting enough. Selenium works the other way round.

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You’ve seen it all over TikTok. Usually that means the evidence is thin. This time it isn’t.

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You’ve seen collagen sold for glowing skin. But here’s what the marketing leaves out: it works better on your joints.

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If you take more than one supplement, the order and timing can matter. Some minerals compete for the same route into your body, so taking them together means you absorb less of both. A few combinations cause bigger problems than poor absorption. Most of it is fixed by spacing doses a couple of hours apart.

MSM started out as a joint supplement and has quietly moved into the hair and skin aisle. The pitch is that it supplies sulfur, and sulfur is part of what makes hair strong. The chemistry behind that is sound. The human research to back it up has not been done.

Hair and nails are made almost entirely of keratin, so a keratin supplement sounds like the most logical product on the shelf. Give your body the thing your hair is made of. The problem is that keratin is one of the hardest proteins to digest, and most keratin supplements are built from sources your body cannot use.

Losing handfuls of hair a few months after having a baby is alarming, and it happens to most women. The good news is that it follows a predictable pattern and sorts itself out. The less welcome news is that the supplements marketed for it rarely change anything, because the cause is hormonal.

Of all the nutrients tied to hair loss, iron has the strongest case. It comes up again and again in the research, especially in women. It is also one of the few you can actually test for, which makes it more useful than most of the vitamins sold for hair.