Formulated by professionals: Each one of BioSchwartz’s professional grade supplements is created by a team of highly experienced healthcare professionals in the USA following strict GMP guidelines to ensure the greatest benefits are achieved. Purity tested & allergen free: Each and every batch of BioSchwartz ultra pure bone strength are third party tested to guarantee high purity, potency, and quality. This formula has been manufactured without GMOS, soy, gluten, milk, egg, wheat, peanuts, or shellfish. They also don't include preservatives, artificial ingredients, fillers, chemicals or color additives. Optimal absorption: BioSchwartz ultra pure bone strength includes magnesium to assist in calcium absorption, an essential mineral for bone health. Comprehensive bone health formula: BioSchwartz ultra pure bone strength features key bone building nutrients including Vitamin K2, Calcium and Vitamin D3 for bone support.