BioPerine®is a patented extract obtained from black pepper fruits (Piper nigrum) standardized minimum to 95% Piperine and has been used as a bioavailability enhancer for over 20 years. This premium ingredient may be found in High Absorption CoQ10 and other Doctor's Best products.

For over 30 years, OptiMSM has set the MSM standard for purity, safety, & consistency in nutritional applications for healthy aging, joint support, recovery and hair, skin & nails products. This powerhouse ingredient is found in products such as MSM; Glucosamine/Chondroitin/MSM and many more.

Quatrefolic® provides the metabolic reduced folate form utilized and stored in the human body, the (6S)-5-methyltetrahydrofolate and are a key ingredient in such Doctor's Best products such as Doctor's Best Fully Active Folate 400 and 800mg as well as our potent Multi-Vitamin product.

PepZinGI™ is a specific chelate of zinc that has been the subject of over 100 scientific studies, including at least 38 clinical trials, for its role in supporting stomach health. This potent ingredient may be found in our PepZin GI Zinc L-Carnosine.