Vitamins for Children: Should You Give Them, Why, and Which Ones to Choose?

Vitamins are micronutrients that are essential for the proper functioning of the body. They play a role in key biological processes such as bone growth, nervous system maturation, energy metabolism, and immune system function. In children, these processes are particularly active, which explains age- and development-specific nutritional requirements.

Reference documents from INRAE emphasize that these needs are clearly defined and that, in most cases, a varied diet is sufficient to cover all necessary vitamin intakes¹. Fruits, vegetables, cereal products, sources of animal or plant protein, and dairy products form the foundation of a balanced diet capable of meeting these needs.

The popularity of vitamin supplements is often driven by fear of deficiency. However, scientific data show that true vitamin deficiencies in healthy children are relatively rare in industrialized countries.

An analysis of the scientific literature indicates that most children reach adequate intake levels for the majority of vitamins when they consume a diversified diet². Several reviews published in international journals conclude that systematic vitamin supplementation does not improve growth, cognitive performance, or overall health in children without an identified deficiency³⁻⁴.

French academic research supports these findings. Several university theses highlight that parental concerns are often linked to eating behaviors perceived as imperfect, but which do not necessarily correspond to measurable biological deficiencies⁵⁻⁶⁻⁷.

Vitamin D represents a special case. Unlike many other vitamins, it is mainly synthesized by the body through exposure to sunlight. In children, this exposure is often insufficient, particularly during winter months or in certain geographic regions.

INRAE documents and several scientific publications indicate that vitamin D insufficiency is common and justifies recommended supplementation for infants and sometimes young children⁸⁻⁹. This supplementation aims to prevent disorders of bone mineralization and rickets and is based on a strong scientific and institutional consensus.

Certain specific situations may expose children to vitamin deficiencies. Restrictive diets, such as strict vegetarian or vegan diets, can lead to a risk of vitamin B12 deficiency, which is essential for proper nervous system function. Similarly, some digestive or inflammatory conditions may impair vitamin absorption.

Academic studies emphasize the need for individualized assessment in these contexts. Supplementation should not be automatic but guided by a healthcare professional based on a precise nutritional or medical situation⁵⁻⁷.

Many dietary supplements marketed for children claim benefits for immunity, concentration, or brain development. However, available scientific data do not show significant benefits of these products in healthy children.

Vitamins are often perceived as harmless, which is not always the case. Fat-soluble vitamins, such as vitamins A and D, can accumulate in the body and cause adverse effects when consumed in excessive amounts. Popular science sources remind us that supplements never replace a balanced diet and that the idea “more is always better” has no scientific basis¹².

The topic of probiotics is often associated with that of vitamins, particularly in children. However, these are distinct products that act through different mechanisms. The gut microbiota plays a fundamental role in digestion, immunity, and immune system maturation from early childhood.

A child’s gut microbiota evolves significantly during the first years of life and is influenced by diet, environment, and medical treatments¹³⁻¹⁴. A balanced microbiota contributes to protection against certain pathogens and to proper nutrient absorption.

Some studies show that probiotics may be useful in very specific situations, such as the prevention of certain types of diarrhea or in undernourished children, particularly in specific public health contexts¹⁵. However, these findings do not justify generalized supplementation for all children.

Recent academic work emphasizes the need for caution: the effects of probiotics depend on the strains used, dosages, and clinical context, and their systematic preventive use in healthy children is not supported by sufficient evidence¹⁶. It is therefore essential not to equate probiotics with vitamins or to view them as universal solutions.

Vitamins are essential for children’s health and development, but their intake should primarily come from a varied and balanced diet. In most cases, such a diet is sufficient to meet nutritional needs. Vitamin supplements are only justified in clearly identified situations, such as vitamin D supplementation or certain specific dietary contexts.

As for probiotics, their use should remain targeted and supervised, without confusion with traditional vitamin supplementation. Rather than multiplying supplements, the best approach is to rely on scientific evidence, assess the child’s overall diet, and seek professional advice when in doubt.

References

¹ INRAE
² National Library of Medicine
³ National Library of Medicine
⁴ National Library of Medicine
⁵ CNRS
⁶ CNRS
⁷ CNRS
⁸ INRAE
⁹ INRAE
¹⁰ National Library of Medicine
¹¹ Sciences et Avenir
¹² National Geographic
¹³ ANSES
¹⁴ Ma santé passe par mes microbiotes
¹⁵ Gut Microbiota for Health
¹⁶ CNRS