Step 4

Identify the words "natural" on the vitamin bottle. If the bottle says, "100 percent natural" the vitamin supplement does not contain synthetics. On the other hand, a label that says, "natural," might have at least some synthetic components. According to Earl Mindell's "New Vitamin Bible," only 10 percent of the product must come from natural food sources in order for a company to claim "natural" on the product's label. If the product label does not say "100 percent animal-based" or "100 percent plant-based," the supplement is synthetic.