Ascorbic acid powder manufactured by Thorne Research contains only pure, crystalline Vitamin C, without added corn starch, magnesium stearate, or other diluents or lubricants typically used by other companies. This product is hypoallergenic. A woman who is pregnant or nursing, or who might become pregnant, should consult a health-care practitioner before using this product. PECIAL NOTE: High doses of Vit C (several grams) have been thought to contribute to miscarriage.1/2 to 1 scoop qd