Vitamin D3 is produced
by exposing the skin to sunlight

Vitamin D3

Vitamin D3 is a fat-soluble vitamin and is also called cholecalciferol. It promotes the proper absorption of minerals like calcium and phosphorus in the bones.

We are learning more about the function of vitamin D3. It has been found, for example, that it has a positive effect on mood.

Vitamin D3 in the diet

Foods that contain high amounts of vitamin D3 are fatty fish, cream, butter and cheese. Vitamin D3 is also often added to margarine and vegetable fats. It is also produced by the skin due to exposure to sunlight, unlike vitamin D2 which instead can not be synthesized in the skin.

Lack of vitamin D3

One of the functions of vitamin D is to promote the absorption of calcium in the bones. Any deficiency of vitamin D does not allow adequate absorption of calcium in the bones, resulting in osteomalacia (weakening of the bones). A prolonged deficiency of vitamin D3 can also cause osteoporosis. The bones become more fragile and this increases the risk that they break more easily.

Excess vitamin D3

An excess of vitamin D3 is very unlikely. In case of prolonged intake of a quantity of vitamin D3 greater than 100 micrograms per day, damage can be caused to the heart, kidneys and blood vessels. Among the possible symptoms also include nausea, drowsiness, lack of appetite and constipation.

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Following the placement of a gastric band or sleeve

Following a gastric band or sleeve procedure, it is essential to take a quantity of vitamin D3 of between 5 and 20 micrograms per day. This value corresponds to 100-400% of the Recommended Daily Allowance.

Following gastric bypass surgery, duodenal switch or biliopancreatic diversion procedures

Because of changes to the small intestine as a result of this type of intervention the need for vitamin D3 increase. Vitamin D3, however, is absorbed in the tract of intestine that has been subject to surgery and thus levels may lower following surgery. It is necessary to assume an amount of between 20 and 60 micrograms, ie between 200 - 1200% of the recommended daily requirement, to provide to your body with an adequate daily intake.

Vitamin D3 supplements: It is difficult to take on sufficient amounts of vitamin D3 in the diet, since it is only present in a few foods. FitForMe has created WLS Optimum and WLS Forte multivitamins to help combat any shortfall in vitamin D3 levels.

WLS Optimum and WLS Forte can help you take on the adequate amount of vitamin D3 and all in just one capsule per day. For more information, please refer to our homepage:


Do you have any questions about vitamine D3 or other topics? Contact our Customer Support team or send an email to

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