Also I’d keep this meme in mind because your body will piss most of it away if you already have enough.
Last way too many people ignore outdoors/exercise (benefits way beyond vitamin D including better absorption of nutrients - both food/supp) and even just walking barefoot your body WILL absorb many micro-nutrients (needs more testing!). I
will say my nails grow way faster when taking supplements but also when barefoot outside or even just gardening/digging in the dirt.