Cosmetic-grade glycols and alcohols that dissolve actives and carry formulas u2014 propylene glycol, butylene glycol, vegetable glycerin, benzyl alcohol, and ethanol u2014 for serums, toners, and sprays.
Solvents and carriers in personal care are the liquid phase that dissolvesnactives, fragrances, and preservatives and carries them into a uniform product.nThe main classes are glycols and polyols (propylene glycol, butylene glycol, glycerin) thatnalso function as humectants, and aromatic or volatile alcohols (benzyl alcohol, ethanol) usednwhere fragrance solubility or fast flash-off matters. The choice follows the dosage form.
nnPropylene glycol and butylene glycol dissolve a wide range of actives and hold water innthe formula, commonly at 1 to 10%. The trade-off is sensory: glycols that raise solvency andnhumectancy can leave a tacky feel at higher use levels, so butylene glycol is often chosennover propylene glycol for a lighter finish in leave-on products. Specify glycerin wherenhumectancy is the priority and a glycol where solubilizing an active is.
nnEthanol is the volatile solvent for toners, sprays, and fast-drying systems; it flashesnoff quickly and aids preservation, though it can feel drying at high levels. Benzyl alcoholnis an aromatic solvent that also functions as a preservative and is a declarable fragrancenallergen in some markets. Match the carrier to the dosage form rather than defaulting to onensolvent across a product range.
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