Formula Chemistry Formulation Science Made Simple
Explore formulation science with expert tutorials, ingredient guides, DIY recipes, and free professional formulas.

Workshops & Courses
Want to create something completely your own? Take a Humblebee & Me workshop!

Free Formulations
Over 1000 (!) completely free skincare, haircare, and cosmetic DIY projects.

DIY Encyclopedia
Learn about DIY skincare ingredients; what they do, why we use ’em, substitutions, and more!
New Posts & Formulations

Blog
Salicyclic Acid Solubility in Glycerin, BG, and PEG-400
When ethanol and propylene glycol are not the right fit for your formula, three alternative co-solvents deserve serious consideration: glycerin,
2 March 2026
No Comments

Blog
Salicylic Acid Solubility in Propylene Glycol vs Ethanol
When working with salicylic acid in aqueous cosmetic formulas, the single most important decision after pH is which cosolvent to
1 March 2026
No Comments

Blog
Salicylic Acid Solubility in Water
Salicylic acid solubility in water is one of the most critical factors cosmetic formulators must understand before working with this
28 February 2026
No Comments