The acidity of ascorbic vitamin c can easily cause stomach upset even leading to diarrhea. Buffered vitamin c derived from beets is known to be gentler on the stomach than ascorbic acid which is derived from corn.
Buffered Vitamin C Powder Flavored 7 Oz 198 5 Grams
Thorne Research Buffered C Powder 8oz
Buffered Ascorbic Acid 90 Capsules
