It's always nice to see videos on cosmetics, however you got a few things wrong. - Washing the skin with water does dissolve some natural moisturising factors (NMFs) which are amino acids, urea, pytollidone carboxylic acid (PCA) degraded from filaggrin, and yes some oils are also removed. Soap removes even more oils and thereby increasing evaporation of water from the skin. - The skin does not really have a pH as there is not a lot of solute that would allow a skin to have a pH (outside the stratum corneum), but it is often referred to as such. - Some expensive humectants reduce the visibility of wrinkles, not by swelling the cells but swelling themselves instead (Hyaluronic acid is a prime example of this). - Alpha-Hydroxy acids added to the product may have a keratolytic affect (that is increasing desquamation) by virtue of denaturing the protein - however this is of course pH dependent. - Beta-Hydroxy acids (most commonly salicylic acid) does the same as above but also have preservative effects. - EDTA is used as a sequestering agent not as a preservative - but adding it can help boost the effect of preservatives. - Preservatives used are often sorbates, benzoates, salicylic acid, parabens, phenoxyethanol and a slew of others. - Rancidity is controlled by adding antioxidants such as BHA (Butylated hydroxyanisole), Tocopherols, ascorbates etc. There may be other points I didn't catch in the video in need of correction - however you are completely right that the price is a lot higher than the cost of the ingredients used is.
many lip-balms are wax based and tend to cover up or make dry lip conditions worse, as the only real way to hydrate skin is by increased (inside) cell hydration complex. speaking of more general hydration, there are newly created overpriced powders that contain mostly sodium..which we already have an overabundance of, and it doesnt help with hydration in all but extreme circumstances.
Video suggestion: Celite! Interesting intersection of biology, (ancient) history and chemistry. What is diatomaceous earth, what is it used for, how does it work, and what are the differences between the different types commercially available? Also what are the dangers/health hazards associated with it.
The structure of the protein in skin is bolted in place by the oxidation of adjacent sulfhydryl groups to make disufide bonds. There is such a lot of skin - manufacture and disassembly - that this process has a significant role in protection (buffering) from reactive oxygen species in the environment. This is a very important subject that you could devote one of your excellent tutorials to.
5:10 I get really dry skin on my hands and legs, I assume from being in saltwater too often. Tried a few products but have found Vaseline (petroleum jelly) softened with 15% mineral oil, much more effective.
Great video! I use hyaluronic acid and tretinoin. I don’t know if either of these fall into your categories. I don’t know enough chemistry to know if hyaluronic acid is an alpha/beta or neither.
Hyaluronic acid is neither, but it is a humectant used, glycerin often shows better results for transepidermal water loss but hyaluronic acid is often used to reduce the visibility of wrinkles.
if you've been handling (dilute) bleach for a short amount of time and want to wash it off your hands--water and soap dont work--use any safe mild acid at hand to neutralize the bleach residue so it can wash off. i guess you could use lemon juice or such but, i have barkeeper's friend next to sink already anyway, and that does the trick, as it's a mild acid cleanser.
Trying Vegetable Oil right now. That seems to be working. As itching was interrupting my sleep. Trying to separate it out f/ the hip injury and test anxiety.
Nice video! But i wouldn't give EDTA as an example for preservative. It maybe increase effectiveness of other antimicrobials but it is used more to increase permeability and stability of emulsion in topical formulations. Keep up the good work!
It was listed as a preservative in one of the articles I read but it's hard to find consistency across different accounts, so that detail is nice to know. Thanks for the comment.
Welcome aboard! Conditioners are basically moisturisers for your hair, but it could be interesting to look at different kinds of soap and detergent. Thanks for the idea.
