However, it is known that through dietary intake and/or supplementation, antioxidants such as vitamin C, E, and carotenoids are deposited into the epidermis at higher concentrations compared with the dermis [4,5,6], which suggests the importance of inside to outside treatment of the skin
So, in my opinion, we should be mindful of this fact and not assume that just because intake of a nutrient doesnt hit the recommended value, that intake might not be perfectly sufficient in a different metabolic state
Hormones (Athens Greece) (2020) 19(1):4753
DSIP-like material has been found in the hypothalamus, limbic system, pituitary, and gut
The method according to any of claims 1 to 5, wherein the derivatization reagent is dissolved in solvent to prepare the solution with concentration of 0.01100mg/ml, wherein the solvent is selected from ether, propyl ether, tetrahydrofuran, acetone, methyl ethyl ketone, acetonitrile, propionitrile, ethyl acetate, n-hexane, dichloromethane, chloroform, or their mixture of any two or more