NOW Foods Vitamin C-1000 provides pharmaceutical-grade ascorbic acid in a convenient one-gram tablet — the most well-researched form of vitamin C, with decades of clinical evidence supporting its roles in immune function, collagen synthesis, antioxidant protection, iron absorption, and adrenal health. Vitamin C is a water-soluble antioxidant that must be obtained daily through diet or supplementation, as humans cannot synthesize it endogenously. At 1,000 mg per serving, this dose is within the range used in immune support and antioxidant research. NOW Foods uses pure ascorbic acid without unnecessary fillers or binders and manufactures in their own GMP-certified facility with verified potency on every batch. A reliable, affordable way to maintain consistent, high-dose vitamin C supplementation for ongoing immune and antioxidant support.