Complément Alimentaire Multivitamines

Multivitamin supplements have become indispensable allies for many people, athletes and non-athletes alike.

However, with the multitude of products available on the market, it is essential to understand their composition, benefits, and how to choose the one that best suits your needs.

What is a multivitamin supplement?

A clear definition

A multivitamin supplement is a concentrated formula, in the form of capsules or tablets, that primarily combines a set of essential vitamins and minerals. Its main objective is to increase the intake of certain nutrients in the body.

Typical composition: vitamins, minerals… and more

A complete multivitamin supplement formulation generally contains:

• Vitamins (A, C, D, E, K, and B-group vitamins),
• Minerals and trace elements (calcium, magnesium, zinc, iron, selenium, etc.),
• Sometimes, plant extracts or nutrients (such as ginseng, turmeric, or coenzyme Q10).

The choice and quality of ingredients vary depending on brands, objectives, and target profiles.

What exactly is a vitamin?

Vitamins are micronutrients that offer numerous benefits to the body. Although required in very small quantities, they play essential roles in many bodily functions. For example:

• Vitamin C:
  - Contributes to normal collagen formation,
  - Contributes to the regeneration of the reduced form of vitamin E,
  - Increases iron absorption,
  - And much more.
  
  
• Vitamin B (especially B6 and B12):
  - Vitamin B6 contributes to normal cysteine synthesis, contributes to normal protein and glycogen metabolism. It also contributes to regulating hormonal activity.
  - Vitamin B12 plays a role in the process of cell division.
  - Both these vitamins also contribute to normal homocysteine metabolism and contribute to normal red blood cell formation.
  
  
• Vitamin D:
  - Contributes to normal absorption and utilization of calcium and phosphorus,
  - Contributes to normal blood calcium levels,
  - Plays a role in the process of cell division,
  - And much more.

The human body cannot, or can only very little, produce vitamins on its own. They must therefore be supplied daily through diet or supplementation. According to ANSES (2025), recommended nutritional intakes for vitamins vary according to age, sex, and lifestyle, making personalization essential (1).

And minerals, what are they for?

Minerals (or mineral salts) and trace elements are also vital micronutrients, involved in numerous biological functions. For example:

• Magnesium:
  - Contributes to electrolyte balance,
  - Plays a role in the process of cell division,
  - Contributes to normal protein synthesis,
  - And much more.
  
  
• Iron:
  - Contributes to normal cognitive function,
  - Contributes to normal red blood cell and hemoglobin formation,
  - Contributes to normal oxygen transport in the body,
  - Plays a role in the process of cell division,
  - And much more.
  
  
• Zinc:
  - Contributes to normal acid-base metabolism, to normal carbohydrate metabolism,
  - Contributes to normal protein synthesis,
  - Contributes to normal cognitive function,
  - Contributes to normal DNA synthesis,
  - Contributes to normal fertility and reproduction,
  - Contributes to normal metabolism of macronutrients and fatty acids,
  - Contributes to normal vitamin A metabolism,
  - Contributes to the maintenance of normal hair, nails, and skin,
  - Contributes to the maintenance of normal testosterone levels in the blood,
  - Contributes to the maintenance of normal vision,
  - Plays a role in the process of cell division,
  - And much more.
  
  
• Selenium:
  - Contributes to normal spermatogenesis,
  - Contributes to the maintenance of normal hair and nails,
  - Contributes to normal thyroid function,
  - And much more.

As with vitamins, mineral intake varies by age, sex, and lifestyle.

Why combine the two?

It is the synergy between vitamins and minerals that gives a good multivitamin supplement its strength. Some micronutrients reinforce each other (like vitamin C which increases iron absorption), while others have numerous benefits for bodily functions.

The right supplement does not necessarily have to contain "the most" substances, but rather what is relevant and appropriately dosed.

The benefits of multivitamins

Multivitamins are composed of micronutrients that have many common benefits for the body.

Immune system support

Vitamins C, D, B6, B12 contribute to the normal function of the immune system. Minerals like iron, zinc, and selenium also contribute to the normal function of the immune system. Moreover, vitamin C contributes to maintaining the normal function of the immune system during and after intense physical exercise, which is beneficial for many athletes.

Energy metabolism

Vitamins C, B6, B12 contribute to normal energy metabolism. Magnesium and iron also contribute to normal energy metabolism.

Nervous system and psychological functions

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