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Majority of over the counter supplements contain cheap, synthetic vitamins and minerals, meaning it has less bioavailability and potency. Oftentimes, these over the counter supplements also use doses too low to result in meaningful beneficial effect on the body. Many patients ask Dr. Yao which supplement brands she recommends. While there a handful of reputable brands, Dr. Yao has come to trust the above brands because they use the most bioavailable ingredients, and have independent testing to make sure there are no impurities and that the supplement contains what it states it contains. Patients of Dr. Yao can receive discount for majority of her recommended supplements.