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D3 (cholecalciferol) from either source is the same compound. Because vitamin D is best absorbed when taken with fats or oils, getting it from fish oil helps assure better absorption, but this can also be achieved by taking vitamin D with a meal which contains some fats/oils.Eating fish can also be a great source of vitamin D. Sockeye (red) salmon is particularly rich in vitamin D and, interestingly, canned fish provides more vitamin D per ounce than cooked fish. For example, in a 3 ounce serving, canned sockeye salmon averages 716 IU of vitamin D versus 444 IU in cooked sockeye salmon (see our Canned Fish Review for more details).In online forums some people allergic to wool have reported allergic reaction to taking vitamin D3, particularly at larger doses.
There does not seem to be scientific research on this topic, but, if this is of concern, you can take vitamin D2.
Fish liver oils and the flesh of high-fat fish such as tuna and salmon are among the few foods that naturally contain significant amounts of vitamin D. Cod liver oil, in particular, contains a high amount of the vitamin when compared to other food sources such as eggs, beef liver and milk. Besides milk, other forms of dairy only contain large amounts of vitamin D if they’re fortified with synthetic forms of the vitamin.
Lanolin is derived from wool-bearing animals like sheep. To get vitamin D from lanolin, supplement manufacturers first purify it and crystallize it, then put it through a chemical process that produces a substance called 7-dehydrocholesterol. The 7-dehydrocholesterol is then liquefied in an organic solvent and exposed to ultraviolet radiation.
Same Body Effects
When scientists create vitamin D from lanolin with the help of ultraviolet radiation, they partially mimic the natural process in your body that produces vitamin D when you expose your skin to sunlight. Both synthesized D-3 and D-3 from food act the same way in your body, according to the National Institutes of Health’s Office of Dietary Supplements. Potential consequences of taking too much of the vitamin include unwanted weight loss, heartbeat irregularities and damage to your heart, kidneys or blood vessels.
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Since vitamin D3 is naturally found in the human body, it is generally considered the preferred form of vitamin D supplementation, which is obtained (mostly) from lanolin that is sourced from sheep’s wool (lanolin). There is another type of Vitamin D3 which is 100% vegan and vegetarian and sourced from lichen extract.