Each nutrient has a recommended daily allowance (RDA), which is the recommended amount that should be taken each day to stay healthy. The RDA reflects what an average individual needs, but is highly dependent on age, gender, weight and metabolism. Labels always state an RDA (sometimes referred to as a reference intake (RI)).

Personal advice

The Nutrition Center recommends a diet that contains all nutrients sufficiently, so that supplements are not necessary. The need for supplementation is very personal and can be helpful in supplementing any deficiencies in the normal diet. As an example: vegetarians (who consume little dairy) and people who eat vegan will receive less vitamin B12 through their diet and will benefit from supplementation of vitamin B12. And eating little to no bread and salt poses a risk of iodine deficiency, which makes iodine supplementation advisable.

Even when there is type 2 diabetes and the blood sugar level is elevated, it is important to eat a healthy diet. That is, little processed products. In the beginning, supplements will help, especially if you have been eating unhealthy foods for a while. It takes some time for your body to replenish the deficiencies. Our experts can help you with this.


There is also a safe upper limit for many nutrients; intake of an amount above this margin is actively discouraged and is not harmless. A well-known example of an overdose with dietary supplements is top skater Sven Kramer. Structural too much vitamin B6 supplementation caused damage to his nerves. Vitamin B6 is essential for your body, but dangerous in too high a dose. Therefore, read the labels of dietary supplements carefully. High doses (1400% of the RDA) are not uncommon in jars that are available at the drugstore. Although these doses do not (often) exceed the safe upper limit, taking several tablets or a combination with high concentrations in food can lead to unpleasant side effects.


One of the supplements that has been in the news a lot lately is resveratrol, mainly due to statements by Peter van der Voort, head of IC at the UMC Groningen in Jinek. He described that corona patients have an elevated leptin, which can lead to a more serious course of the infection. Taking resveratrol (which lowers leptin) could prevent this. Soon after, the supplement sold out in many stores. Although the statements sound promising, there is no proof yet. In addition, little is known about the possible harmful effects of taking resveratrol (in high doses).

In conclusion

Finally, there is no unequivocal answer to the question of whether you should supplement your diet with nutritional supplements. This depends on gender, age, weight, but also to a large extent on your diet. When your blood sugar level is elevated, and you have type 2 diabetes after eating highly processed products, it can be worthwhile to take (temporary) supplements. If you take dietary supplements, at least read the label and know which nutrients (and in what amount) you are getting. Within the Clear nutrition program there is also room to ask our nutrition experts about nutritional supplements.