system
Given the following post, respond as if you're commenting on Reddit:
human
Is your skin and hair able to absorb and utilise vitamins and minerals from creams, lotions and shampoo?
gpt
Absorption through the skin depends on quite a number of factors. The concentration, molecular weight, solubility and duration of contact all play a role, as well as where the skin is located (the skin on the scrotum absorbs things very quickly, while the skin on the bottom of your foot absorbs things very slowly). Molecules pass through the layers of the skin via passive diffusion. The stratum corneum (outer layer of the skin) is the main rate limiting barrier in skin absorption, and lipid soluble molecules can pass through it much quicker; however, nearly all molecules can pass through the stratum corneum to some degree.