While the most common uses for vitamins are pure placebo, your body does actually get the vitamins from them. (Assuming they actually contain it and aren’t falsely advertised) as they’re usually the pure chemical vitamin mixed with a filler powder, (usually something like gelatin or powdered cellulose).
If you’re actually deficient in a vitamin, these supplement are usually quite effective, as it’s literally just the thing you need and some powder. But usually it’s just placebo, like vitamin c for the common cold.
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