?Twinlab - Tri-Boron 3 mg. - 100 Capsules : Twin Lab Tri-Boron 3 mg. Capsules are of the highest quality and purity available. No tablet binders, coatings or colorings. Free of corn, soy, yeast, wheat, milk and egg products. No added falvorings, sugars, salt, artificial sweeteners, colorings or preservatives. Twinlab Tri-Boron is a unique synergistic combination of three highly utilizable, 100% natural chelated sources of the trace mineral boron.