vitamins are not produced endogenously (internally), they must be obtained exogenously (externally) from dietary food sources
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GRC | Vitamin D Research olet light, converting it into harmless heat energy.)
“Vitamin D” was misnamed when it was first discovered hundreds of years ago, before we knew where it came from or how it was made. By definition, it is not a “vitamin” because <span>vitamins are not produced endogenously (internally), they must be obtained exogenously (externally) from dietary food sources.
It seems likely that part of the trouble “Vitamin D” has had with capturingthe attention it deserves is due to the fact that, simply by being misnamed a“vitamin”, it has b Summary
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