Both formulas are designed to effectively combat hair loss, but our new Modern formula includes exosomes, latanoprost, and more, to provide additional regenerative benefits. The Hair Topical Solution - Classic is a clinically proven treatment that targets hair loss with prescription-strength ingredients like minoxidil, dutasteride, and spironolactone, while the new Modern formula enhances those effects by incorporating cutting-edge ingredients like exosomes and Rx latanoprost for improved follicle repair and growth stimulation. These treatments can be used individually, or together for boosted results.