Solgar Boron Capsules are Encapsulated with these natural ingredients: microcrystalline cellulose, cellulose gum, stearic acid. Solgar Boron 3mg Vegetable Capsules. Solgar Boron is: KOSHER. IngredientsBoron (as sodium borate, citric acid, aspartic acid, glycinate)3mg. DirectionsAs a food supplement for adults, one (1) capsule daily, preferably at mealtime, or as directed by a healthcare practitioner. Solgar Boron Vegetable capsule shell: hydroxypropylmethyl cellulose.