Cosmetic Formulation Science Made Simple
Formula Chemistry is your expert guide to cosmetic formulation featuring professional skincare & haircare formulas, in-depth ingredient guides, DIY recipes, and free formulas by Dr. SamiUllah, Ph.D. in Chemistry.
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Blog
Vitamin C vs Niacinamide: The Right Way to Layer
Quick Answer Yes, you can use vitamin C and niacinamide together, and the belief that they cancel out or cause
8 August 2026
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Blog
Niacinamide vs Retinol: Why You Shouldn’t Choose One
Quick Answer Retinol is the more potent anti-aging active, converting to retinoic acid to stimulate collagen and speed cell turnover,
7 August 2026
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Blog
Optiphen vs Phenoxyethanol: Which Needs a Co-Preservative
Quick Answer The Optiphen vs phenoxyethanol comparison is misleading because Optiphen is a preservative blend built around phenoxyethanol rather than
6 August 2026
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