So what about humans? According to a 2021 meta-analysis[0], Vitamin D has "no effect" on muscle growth and may even have a negative effect, particularly at high doses.
Your link seems to support the opposite of your advice. Tryptophan by-product seems to be bad.
> "We are trying to figure out why the changes are happening and if we can target those cells to make them want to make bone again," McGee-Lawrence said.
> [...]
> A major culprit in their breakdown appears to be the metabolite kynurenine, a byproduct of the essential amino acid tryptophan.
> [...]
> Over time, kynurenine piles up and appears to alter the dynamic of bone and muscle formation.
helph67|2 years ago
alecco|2 years ago
> "We are trying to figure out why the changes are happening and if we can target those cells to make them want to make bone again," McGee-Lawrence said.
> [...]
> A major culprit in their breakdown appears to be the metabolite kynurenine, a byproduct of the essential amino acid tryptophan.
> [...]
> Over time, kynurenine piles up and appears to alter the dynamic of bone and muscle formation.
instagib|2 years ago