Scientifically proven

Developed according to the latest scientific insights

At FitForMe, we do not just make vitamins. We do so with a passion for health. And always according to the latest scientific insights. We believe that a healthy life is within everyone's reach. Including those struggling with being seriously overweight. When we developed WLS Forte in 2009, the ultimate vitamin supplement for use after a gastric bypass, we wanted to demonstrate that patients with morbid obesity have significantly fewer vitamin deficiencies after their operation if they take FitForMe's multivitamins. Therefore, researchers from Rijnstate Hospital in Arnhem carried out scientific research into this multivitamin.

A scientific basis

Scientific literature already stated that it is a challenge for people to take in sufficient vitamins and minerals after a gastric bypass. It is precisely all those vitamins and minerals that ensure that we feel well! In 2011, the Vitaal Studie (clinical trial) commenced at Rijnstate Hospital in Arnhem. Years of research followed. Did our supplement work better than standard multivitamins?


For a year, the effect of the daily consumption of multivitamins after a gastric bypass operation was recorded. In particular, the difference between WLS Forte's special dosage and standard supplements containing 100% of the recommended daily allowance (RDA), was researched in detail. 

Scope of the research

150 patients participated in the study. They were divided into two groups. One group was given FitForMe's WLS Forte, the other group was given a standard multivitamin containing 100% of the recommended daily allowance (RDA). Patients were unaware of which supplements they had been given. They were asked to take one capsule every day. Levels of all vitamins and minerals were measured via blood samples. This was done 1 month before the operation, 6 months after the operation, and 12 months after the operation. 


The conclusion of the study? The group that had taken WLS Forte produced far better blood counts for vitamin B12 and folic acid, and even had optimal iron levels. Besides, this group felt better than the group that had taken the standard multivitamin. WLS Forte is proven to keep vitamins and minerals at a healthy level.

The future

Thanks to the impressive results that could also be supported scientifically from that point, bariatric physicians and the Nederlandse Obesitas Kliniek (Dutch Obesity Clinic) also became enthusiastic about WLS supplements from FitForMe. But we did not stop there! After the study, we improved WLS Forte further. Afterwards, we developed WLS Optimum for people who are having a gastric band or gastric sleeve operation. And WLS Maximumfor people who are having a biliopancreatic diversion or duodenal switch. Because a healthy life is within everyone's reach.


Naturally, we continued with the Vitaal Studie (clinical trial). We will shortly know the results of 36 months of use of the multivitamins. In addition, comparative research is being carried out with WLS Optimum, our multi for people who have had a gastric band or gastric sleeve. As soon as the results are available, you will be the first to know!