One of the the secrets is L-Cystine, an amino acid which stimulates the production of glutathione an antioxidant that exists in the body which several studies have shown produce a skin whitening-effect
Rejuvenated Appearance: BHRT restores hormonal balance, providing benefits such as improved skin elasticity, reduced wrinkles, and increased collagen production
This applies to PPO, HMO, Medicare, and Medicaid
And as for how often to use it, I would say every day if you can via your day and night creams, serums and eye care - my favourite is the Eyelid Lift Serum. BEST GLUTATHIONE SKIN CARE GLUTATHIONE SKIN BENEFITS FAQs Is glutathione better than retinol
Long-term carcinogenicity data in rodents is limited
Stick with veterinary-grade or properly compounded sources