Now AlphaSorb-C 500mg Vitamin C is best known as an antioxidant that can protect the body's cells and molecules from damage by free radicals. AlphaSorb-C includes Transport C-PLUS, a trademarked combination of Threonic Acid-enhanced, buffered (non-acidic) Calcium Ascorbate with Alpha Lipoic Acid. Threonic Acid is a Vitamin C metabolite that has been shown to enhance cellular uptake of Vitamin C. Alpha Lipoic Acid functions as a free radical scavenger that can help regenerate Vitamin C in the body and may also enhance its utilization. With this formula, NOW has created a well-absorbed and highly biologically available Vitamin C supplement. Recommended Use: Take 1 capsule 1 to 3 times daily, preferably with food, or as directed by a healthcare professional. Store in a cool, dry place after opening.Now AlphaSorb-C 500mg Facts: 1 veg capsule contains: Vitamin C (from Threonic Acid Enhanced Buffered Calcium Ascorbate) 500 mg Calcium (from Buffered Calcium Ascorbate) 60 mg Transport C-PLUS (Trademarked blend of Threonic Acid Enhanced Buffered Calcium Ascorbate and Alpha Lipoic Acid) 650 mg Alpha Lipoic Acid 40 mg Citrus Bioflavonoid Complex 100 mg Acerola Powder (Malpighia punicifolia) (Fruit) 25 mg Rose Hips Powder (Rosa canina) (Fruit) 25 mg Rutin Powder (Sophora japonica) (Flower Bud) 25 mg Other Ingredients: Cellulose (capsule), Cellulose Powder, Stearic Acid (vegetable source), Magnesium Stearate (vegetable source) and Silica.