Our source library

Sources & further reading

Provider pages establish what a brand markets. Clinical and regulatory sources establish the limits of the evidence. Accessed October 8, 2026.

1. CoreAge Rx — current treatment catalogProvider marketing; commercial terms and product availability
2. CoreAge Rx Help Center — What products does CoreAge Rx offer?Provider catalog, updated October 5, 2026; formulations and consultation terms
3. Musely — anti-aging treatment catalogProvider product and advertised-price information
4. Musely — The Anti-Aging CreamProduct page; price expressed as a monthly equivalent for a two-month supply
5. Musely — The Aging Repair CreamProduct page; provider-reported outcomes are not independent comparative trials
6. Curology — personalized prescription skincareProvider overview and subscription offers
7. Curology — HydroTret Rx, formerly Future-Proof RxCurrent product name, ingredients and advertised prices
8. Curology — Custom Formula RxFormula options and consultation process
9. Curology — ingredient directoryProvider-maintained ingredient lists; updated September 23, 2026
10. Agency — personalized skincareProvider overview; withagency.com redirects to the current brand site
11. Agency — Night Renew RxProduct page; not every personalized formula contains tretinoin
12. Agency — Dark Spot RxProduct page; not every personalized formula contains hydroquinone
13. American Academy of Dermatology — Retinoid or retinol?Dermatology guidance on retinoids, irritation and pregnancy
14. American Academy of Dermatology — How to select anti-aging skin care productsSunscreen, moisturizers, realistic expectations and label claims
15. American Academy of Dermatology — Skin care in your 40s and 50sPractical skin-care foundations for mature skin
16. FDA — Compounding and the FDA: Questions and AnswersCompounded drugs are not FDA-approved; oversight and evidence limitations