Here's a simple emulsion that could work, but the resulting low ~pH 3 could potentially destabilize the emulsion and cause curdling. Looking to make a formula that's nourishing and relatively gentle used as an everyday moisturizer (if making claims about treating acne it would be a OTC drug limited to 2.5% salicylic acid).
Could a silicone based and/or water based formula work better and still work well as a moisturizer? Do you know any good formulas already on the market? Paula's choice 4% SA formula seems to be quite popular.
Sunflower Seed Oil (High linoleic) 10%
Propylene Glycol 8% (SA solubilizer)
Emulsifying Wax NF 6%
Lactic Acid 3%
Sodium Lactate 3%
Salicylic Acid 2%
Phenoxyethanol, Caprylyl Glycol, Sorbic Acid (Optiphen Plus) 1%
Xanthan Gum 0.5%