Comment · Sun, April 5, 2020
Vitamin D
Original post in this thread
numberg · 15 points
I want to buy all of my supplements from Nootropics Depot because of their unparalleled attention to safety. For this reason, I'd like to request ND carry more supplement basics like vitamn D, K2, C, etc. Thanks.
What they were answering
Randyjuice · 1 points
I thought fat soluble vitamins should not be taken at the same time due to absorption competition.
u/MisterYouAreSoDumb
No, that's a huge myth. It's over-simplifying a complex system down. Everything absorbs through different pathways. There are TONS of different transport systems in the GI tract. You've got ion transporters, glucose transporters, dipeptide channels, organic cation transporters, etc. Some things absorb in the stomach, while others absorb further in the intestines. It is a complex system that cannot be boiled down into simplified terms. Even solubility is more complex than people think. Molecules can have water-soluble functional groups AND lipid-soluble functional groups. Even how you measure its solubility varies. You have ALogP, XLogP, CLogP, or Moriguchi’s method MLogP. So how something will absorb, and what pathways it uses, is very complex.