Ultra Potent-C 1000:

The same exclusive, patented formula as Ultra Potent-C 500, but with 1,000 mg of vitamin C per tablet and a higher potency metabolite support system.

Ultra Potent-C Powder:

Features the same high-quality, patented formula as Ultra Potent-C tablets, but in a convenient powder form that provides 4,350 mg of vitamin C per serving.