If you see the vitamin listed as the vitamin itself, such as "vitamin D," then it is sure to be the synthetic version, according to Dr. Ben Kim, a Canadian chiropractor and radio show host. Look for food sources such as "citrus" instead of "vitamin C" or "parsley" instead of "vitamin K."

You can make wiser choices when purchasing vitamins by learning to identify synthetic dietary supplements from natural vitamin products. Manufacturers of dietary supplements sometimes use synthetic materials for increasing the vitamin's potency and stability. According to the Organic Consumers Association, some of these materials come from coal tar derivatives, the same toxins that cause throat cancer in tobacco smokers. Before shopping for vitamin supplements, know what to look for in a vitamin product that may cause harm to your health.

Step 1
Search for words listed in the ingredients that begin with "dl." When a word contains "dl" in the prefix, it is an indication that the vitamin is synthetic. As an example, "dl-alpha tocopherol acetate" and "dl-alpha tocopherol" are synthetic forms of vitamin E.

Step 2
Find words that end with "ate" or "ide" in the list of ingredients. These words indicate that the manufacturer used synthetic materials for increasing the vitamin's potency and stability. Some words to look for include nitrate, acetate, sodium ascorbate, sodium benzoate, chloride, hydrochloride, silicon dioxide and titanium dioxide.

Step 3
Find the synthetic form of the vitamin listed under the ingredient list. Natural vitamins come from natural food sources. If you see the vitamin listed as the vitamin itself, such as "vitamin D," then it is sure to be the synthetic version, according to Dr. Ben Kim, a Canadian chiropractor and radio show host. Look for food sources such as "citrus" instead of "vitamin C" or "parsley" instead of "vitamin K."

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.

Step 5
Look for the vitamin potency listed on the product's label. According to the Organic Consumers Association, if the vitamin supplement has a high or otherwise unnatural potency, the product is synthetic. For example, a product that provides 1,000 percent of vitamin C is unusually high. This is ten times the amount you need daily, and an amount that even a healthy diet -- consisting of natural, whole-food sources -- cannot provide.

The following website has one of the best sources of information regarding synthetic and natural vitamins. thehealthyrd.com.

Some studies suggest that excessive intake of specific synthetic vitamins could lead to harmful side effects. These can range from nausea and diarrhea to more severe issues like kidney stones (calcium carbonate is a primary cause along with high doses of ascorbic acid) or nerve damage.