retinol

The tricky part is there's all sorts of people that sell Retinol products but the amount of retinol is OTC.

Until recently, it was thought that the sole important retinoid delivery pathway to tissues involved retinol bound to retinol-binding protein (RBP4).

They're minimal; retinol is usually mixed with a carrier oil or cream in various concentrations and applied topically.

Carotenes once absorbed then go on to have an also awful and highly variable conversion rate to retinol.

Here's one speculation of lay-person reasoning: - Cosmetics people like Retinol skin creams because it makes skin look better.

Because it varies with different people with different liver storage capacity and historic retinol compound buildup.

From what the skin above the nailbeds looks like, the person probably has a retinol deficiency.

All the referenced studies (none of them are behind a paywall): The Beta-Carotene and Retinol Efficacy Trial: incidence of lung cancer and cardiovascular disease mortality during 6-year follow-up after stopping beta-carotene and retinol supplements.

Vegans are typically deficient in retinol which is used in the development of epithelial cells an essential and basic component of animal tissue.

- Vitamin A in the blood is supposed to be wrapped in Retinol Binding Protein to carry it through the blood, but it isn't always.

To be honest, the best really is to just use retinol creams?

Thankfully, high-dose Vitamin A / retinol supplements are not as widespread.

And stuff like retinol is starting to get regulated for “everyone” anyway.

- Retinol in the diet -> retinol in the blood -> triggers stem cell split in the blood vessel walls -> thickening of the walls ("youthful!") -> narrowed blood vessels.

I'm talking massive signs with every prescription med under the sun-- Adderall, Xanax, Retinol, you name it.

Retinol, aka Vitamin A1, is found in high concentrations in such foods as cow and chicken livers, butter, cheese and eggs, and cod liver oil.

Vitamin C, Retinol, etc) would be good for you, but when it sees something that isn't a skincare product or a skincare concern, it gets confused and doesn't return anything.