The lack of calcium may not cause white spots on the nails, but it would still be important for their structure. Thus, a study showed that calcium supplementation (1 g / day for 1 year) improved the quality of the nail. In addition, their fragility would decrease with biotin supplementation (2,5 mg daily) while regular consumption of carotenoids, through food or supplements, could be effective against onycholysis (a painful detachment of the tip of the nail).

On the other hand, no study has proven that taking vitamins E, A, C and B12, retinol, iron, zinc, copper, or even selenium improved the health or appearance of the nail in people whose diet is balanced. For others, it is obvious that all nutrients are important for the nail as for all the structures of the body.

Jean Krutmann,Philippe Humbert, Nutrition for Healthy Skin: Strategies for Clinical and Cosmetic Practice, Springer Science & Business Media, 8 nov. 2010 — 208 pages Jean Krutmann,Philippe Humbert, Nutrition for Healthy Skin: Strategies for Clinical and Cosmetic Practice, Springer Science & Business Media, 8 nov. 2010 — 208 pages