I buy 3-20 oz powder Crystals at $0.02 cents a gram from Puritan Pride. Also tabs and capsules. I have taken many types vitamin ‘C’. mostly quality ascorbic acid. Once your stomach gets use to ‘C’, when or how you take it, dos’t seem to make any difference. Puritan Pride like many other vitamins sellers has a wide verity of choices. I have taken ‘C’ for over 50 years,