Stable personal care compositions containing a retinoid
Personal care compositions that include a stable O/W emulsion, a stable retinoid, an oil, a fatty alcohol, and an emulsifier and methods of using such compositions to regulate a condition of mammalian keratinous tissue. By combining the oil and retinoid at a particular ratio in the personal care composition, the stability of the retinoid can be improved.
1. A topical personal care composition having improved stability of retinyl propionate, comprising:
a) a dermatologically acceptable carrier in the form of an oil-in-water (O/W) emulsion;
b) retinyl propionate;
c) capric/caprylic triglyceride, wherein the weight ratio of capric/caprylic triglyceride to retinyl propionate is about 15:1 to about 35:1 when the composition is made;
d) an emulsifier, wherein the weight ratio of capric/caprylic triglyceride to emulsifier is about 4:1 to about 50:1;
e) a fatty alcohol, wherein the weight ratio of fatty alcohol to emulsifier is about 1:1: to about 11:1; and
f) wherein less than 15% of the retinyl propionate degrades according to the HPLC Method.
2. The composition of claim 1 , wherein the composition comprises about 0.0001% to about 2%, by weight of the composition, of the retinyl propionate.
3. The composition of claim 2 , wherein the composition comprises about 0.01% to about 1%, by weight of the composition, of the retinyl propionate.
4. The composition of claim 1 , wherein the retinyl propionate is present at about 0.1% to about 0.5%, by weight of the composition.
5. The composition of claim 1 , further comprising about 0.01% to about 5%, by weight of the composition, of a water-swellable material selected from the group consisting of clays and superabsorbent polymers.
6. The composition of claim 5 , wherein the water-swellable material is a superabsorbent polymer.
7. The composition of claim 6 , wherein the superabsorbent polymer has a dry, number-average particle size of about 2 μm to about 100 μm.
8. The composition of claim 1 , wherein the composition further comprises a skin care active selected from the group consisting of vitamins, proteins, zeolites, peptides, skin-lightening agents, sunscreen actives, terpene alcohols, desquamation actives, anti-acne actives, anti-wrinkle actives, anti-atrophy actives, anti-oxidants, flavanoids, anti-inflammatory agents, anti-cellulite agents, tanning actives, skin soothing actives, skin healing actives, conditioning agents, and combinations thereof.