Hi Brains! Big fan here. Can we talk about pH? I know you've touched on this topic before in regards to glycolic acid, but I'm wondering about other actives, in particular retinol, sal acid, niacinamide, hyaluronic acid, and L-ascorbic acid alternatives such as sodium ascorbyl phosphate.
I'm aware that the best pH level will vary for all of these, so what about when the ingredients are all included in one product? Here's an example ingredient list for a Vitamin C Serum I found on Amazon, which I believe has a pH of around 7:
Organic Herbal Water, Organic Aloe Barbadensis Leaf (Aloe), Sodium Ascorbyl Phosphate (Vitamin C), Cassia Angustifolia Seed Polysaccharide (Plant Derived Hyaluronic Acid), Hamamelis Virginiana (Witch Hazel), Retinol, Niacinamide (Vitamin B3), CoQ10, Carbomer, (2s)-2-Amino-5-guanidinopentanoic Acid, Triticum Vulgare (Wheat Germ Oil), Wildcrafted Camelia Sinensis (Green Tea), Wildcrafted Resina Propoli (Propolis), Organic Simmondsia Chinensis (Jojoba Oil), Kosher Vegetable Glycerin, Haematococcus Pluvialis Extract (Astaxanthin), Sucrose Stearate, Polyglyceryl-10 Laurate, Lecithin, Tocopherol, Pentylene Glycol, Phospholipids, Polysorbate 20, Potassium Phosphate, Phenoxyethanol, Ethyl Hexyl Glycerin.
Can a product contain all of these actives and still function at a pH higher than 5 or is there something off about this to you? Thanks!