Vitamin K is important
for blood clotting

How does Vitamin K work?

Vitamin K is a fat-soluble vitamin and is also called phylloquinone. This vitamin is important for bone metabolism and blood clotting.

Vitamin K is produced, in part, by the bacteria present in the intestine (large intestine). This process begins after three months of life. The quantities produced, however, are not sufficient and in most cases, it is necessary to take vitamin K through the diet. Newborn babies need supplemental vitamin K up to three months after they have been born. No reserves of this vitamin are transmitted from mother to child and the intestine is still unable to produce adequate amounts.

Try for free!

Request a free starter pack and start to get your fill of vitamins and minerals. The starter package will be delivered to your home for free.

Vitamin K in the diet

There are two forms of vitamin K: vitamin K1 (phylloquinone) and vitamin K2 (menaquinone).

Vitamin K1 is primarily found in green leafy vegetables and vegetable oils. It is also present in fruit, bread and dairy products, but in smaller quantities. Vitamin K2 is found mainly in cheese, chicken, meat, dairy products and eggs.

Lack of Vitamin K

A deficiency can lead to a slowdown in the process of blood clotting and subsequent bleeding. A deficiency of vitamin K is rare, however.

Excess Vitamin K

An excess of vitamin K is extremely rare.

FitForMe Newsletter

Stay up to date with everything at FitForMe – Subscribe to our Newsletter

Our Products

Check out the full FitForMe range here

Following the placement of a gastric band or sleeve

If you recently underwent surgery for the placement of a gastric band or sleeve, it is important to take a lot of vitamin K; between 75 and 150 micrograms per day. This value corresponds to 100-200% of the Recommended Daily Allowance.

Following gastric bypass surgery, duodenal switch or biliopancreatic diversion procedures biliopancreatica

Despite the changes made to the small intestine as a result of this type of intervention, your needs for vitamin K is not increased. The tract of the intestine that works to absorb vitamin K into the system is not affected. It is necessary to assume an amount of between 100 and 150 micrograms, or 150 - 200% of the recommended daily requirement, to provide to your body with an adequate daily intake.

Vitamin K supplements

If you are taking or have taken antibiotics recently, you must control the level of vitamin K in your body, because these drugs reduce the bacteria of the intestinal flora responsible for the synthesis of this vitamin. Even those who take anti-coagulants should carefully monitor their intake of vitamin K. This fact plays a fundamental role in the process of blood clotting. It is advisable to contact your doctor before taking a supplement of vitamin K

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


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

Order a free starter kit!

Did you know you can request a free starter pack of FitForMe weight loss surgery supplements? Click here to request it now for free!