VDR
VDR vitamin D receptor — the molecular target that 1 compounds in the wiki act on.
In one line: The receptor that vitamin D uses to switch on hundreds of genes.
The vitamin D receptor (VDR) is how vitamin D does its job. Vitamin D isn't really a vitamin — it's a hormone your skin makes from sunlight. Once activated, it plugs into the VDR, and the pair switches on more than 200 different genes involved in immunity, muscle function, bone strength, and even testosterone production.
Because so much depends on it, being deficient quietly drags down many things at once — mood, immune resilience, muscle quality, and hormones. And deficiency is extremely common in people who work indoors, even in sunny places.
That's why correcting low vitamin D is one of the highest-value, lowest-cost health moves for most people — it's not about megadosing, it's about not being deficient in the first place.