Garnier Summer Body Gradual Tan Lotion Versus Palmer's Natural Bronze Gradual Tanner

DHA does not penetrate living skin cells, does not interact with melanocytes, and does not affect actualy melanin production.

There's a "safety controversy" that largely stems from misinterpreted studies:

Once concern is that DHA can generate unstable molecules that can damage cells (free radicals) when exposed to sunlight. This only happens in the outermost layer of dead skin cells and wearing SPF on top takes care of it.

The DNA damage claim comes from lab studies that doused living skin cells in much higher concentrations of DHA than you'd ever find in a self-tanner. That's not really a meaningful comparison to putting self-tanning lotion on your skin.

Regulatory bodies around the world, including the EU's Scientific Committee on Consumer Safety (SCCS) and the U.S. FDA consider it safe for use in cosmetics when applied topically (maximum 10%, and most self-tanners contain between 3-5%).

Dimethicone comes in different viscosities:

Depending on the viscosity, dimethicone has different properties.

Ingredients lists don't always show which type is used, so we recommend reaching out to the brand if you have questions about the viscosity.

This ingredient is unlikely to cause irritation because it does not get absorbed into skin. However, people with silicone allergies should be careful about using this ingredient.

Note: Dimethicone may contribute to pilling. This is because it is not oil or water soluble, so pilling may occur when layered with products. When mixed with heavy oils in a formula, the outcome is also quite greasy.

Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3.

Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin.

This ingredient is non-irritating, plays well with almost every ingredient, and works across all skin types. Typical use is anywhere between 3-10% but can go up to 79% in some leave-on products.

Just know very high concentrations (>40%) can feel tacky in low humidity.

Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.