Hello, I'm planning on creating a 100g batch to make a DIY hydrating serum and wanted some advice on the formula and how to make it. This is my first time doing this.
My goal is to make a serum that is really hydrating and includes multiple types of hydration, (Immediate, Cellular, Multi-depth, long-lasting) plus additional soothing and barrier support while being generally safe for all skin types and minimalistic.
Here's what I plan on:
Distilled Water q.s. to 100%
Panthenol 5%
Glycerin 4%
Propanediol 3%
Betaine 2%
Beta-Glucan 0.5%
Ectoin 0.5%
Sodium PCA 0.5%
Polyglutamic Acid 0.1%
Sodium Hyaluronate 0.2% (7 molecular weights)
Hydroxyethylcellulose 0.3%
Disodium EDTA 0.1%
PE 9010 1%
Gluconolactone q.s. to pH 5.0–5.5
Any advice/criticism about my formula is greatly appreciated but I am mostly worried about if my preservative system is enough (I'm also using airless pump bottles), what the texture will be like (I'm using propanediol and hydroxyethylcellulose to reduce tack), and if the humectant ratios are too much/too little. Also, this is my first time actually making a serum and any advice on how to go about that is appreciated too. Thank you!