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PaulHoule 4 hours ago

It's arguable whether Vitamin D is really a vitamin or a hormone, see

https://pubmed.ncbi.nlm.nih.gov/33549285/

Look at the molecular structure

https://en.wikipedia.org/wiki/Vitamin_D

that's a freakin' steroid with one of the bonds in the rings deleted

https://en.wikipedia.org/wiki/Secosteroid

brandonb 4 hours ago | parent [-]

It's pretty well-established science now that vitamin D is a hormone, not a true vitamin. Vitamin D binds a nuclear receptor that regulates roughly 1,000 to 2,000 genes (5-10% of the human genome).

The "Vitamin D" moniker has just stuck around since it was named in 1922.

infinite_spin 4 hours ago | parent [-]

Yeah, it's just a holdover, the term "vitamin" originated from "vital amine", and vitamin D doesn't even have an amine group

raverbashing 3 hours ago | parent [-]

Well neither does Vitamin C.

PaulHoule an hour ago | parent [-]

It is a cofactor though

https://en.wikipedia.org/wiki/Vitamin_C#Pharmacology