Signature-Rx is a compounding Pharmacy which produces (synthesizes) hormones and other drugs, specifically for HRT / Anti-Aging Clinics. There aren't many 'compounding' pharmacies in existence today but they essentiallly have the equipment to compound (synthesize) certain drugs, similar to what a generic manufacturer would! They provide an alternative to buying BRAND name drugs, which we all know, can be very expensive! If you have a product bearing their label, chances are it's legit!
JD