Vitamin D During Perimenopause

Why does this essential micronutrient deserve special attention?

Vitamin D is often associated with bone health. But its role goes far beyond that. It plays a part in a wide range of areas, including boosting the immune system, supporting muscle health, maintaining a balanced mood, and ensuring our metabolism functions properly.

Ce qui la rend d’autant plus précieuse en période de périménopause (cette période qui s’étant de la pre-ménopause à la post-ménopause) c’est que sa carence passe souvent inaperçue. Les manifestations d’une carence en vit D peuvent facilement être confondues avec les symptômes de la transition hormonale. A la ménopause, la vitamine D est une alliée naturelle pour contrer certains effets de la chute des oestrogènes , en soutenant par exemple la minéralisation osseuse. 

Vitamin D: a hormone, much more than just a vitamin.

The term "vitamin D" refers to a group of fat-soluble compounds (the calciferol family). There are two forms of nutritional importance: 

• Vitamin D3 (cholecalciferol), which the skin synthesizes when exposed to sunlight and is found in certain foods (fatty fish, cod liver, organ meats, eggs, dairy products, etc.). 
• Vitamin D2 (ergocalciferol), on the other hand, is synthesized by plants and is found in foods such as mushrooms. 

However, vitamin D3 has greater biological activity than D2, and the vast majority of studies demonstrating the health benefits of vitamin D supplementation have been conducted using the D3 form.

The active metabolite of vitamin D, known as calcitriol, is actuallya “fat-soluble hormone” —sometimesalso called “hormone D”—that acts on specific receptors through a mechanism similar to that of hormones synthesized by our bodies. The precursor to the active metabolite of vitamin D is produced by the skin when exposed to sunlight, and must then be activated by the liver and then the kidneys. 

This active metabolite of vitamin D plays a role in numerous processes; in particular, it regulates the intestinal absorption of calcium and phosphorus, but its role extends far beyond that. Adequate vitamin D levels promote dental and bone health, strengthen the immune system, and reduce the risk of autoimmune diseases, several types of cancer, and cardiovascular problems. Vitamin D also plays a role in maintaining our cognitive functions.

During perimenopause, it provides support on several fronts at once—precisely those areas that are weakened by the hormonal transition.

Vitamin D isn't a luxury. During perimenopause, it's one of the most well-documented nutritional pillars.

Her role during perimenopause

Maintaining bone health

A decline in estrogen accelerates bone loss. Vitamin D is essential for the body to properly absorb dietary calcium and use it effectively. Without it, the body may draw on its own bone reserves, gradually weakening the skeleton.

Studies conducted on premenopausal and postmenopausal women show that vitamin D supplementation combined with calcium helps maintain bone density over the long term.

Improves muscle strength

Vitamin D receptors are present in muscles. Adequate vitamin D levels are associated with greater muscle strength in postmenopausal women. This benefit is particularly important during a time when muscle mass tends to decline naturally.

Improve mood and emotional well-being

Perimenopause is recognized as a period of increased vulnerability to mood swings and, in some cases, depressive episodes—even among women with no prior history of depression. Vitamin D plays a role in neurocognitive health and is involved in regulating certain neurotransmitters, particularly dopamine and serotonin.

Vitamin D deficiency is a risk factor for mental health conditions such as depression andanxiety. Studies show that people with low vitamin D levels are more likely to develop these conditions.

Support cardiovascular health and metabolism

Vitamin D deficiency and perimenopause share several common risk factors: cardiovascular disease, metabolic syndrome, and type 2 diabetes. Maintaining adequate vitamin D levels during this period may help support overall metabolic balance and cardiovascular health.

Les scientifiques ont notamment montré que les personnes carencées en vitamine D (<15 ng/mL de vitamine D dans le sang) sont exposées à un risque d’accident cardiovasculaire accru de 62 %.

Live longer 

Vitamin D appears to play a key role in maintaining the integrity of genetic information at the chromosomal level. Low vitamin D levels are also associated with a higher risk of mortality from any cause.

Why is this deficiency so common?

Several factors explain why the general population (and particularly women in perimenopause) are deficient in vitamin D, often without realizing it.

• Skin synthesis decreases with age, even with equivalent sun exposure.
• In France, insufficient sunlight between October and April naturally limits production.
• Vitamin D is found in few foods, and rarely in sufficient amounts.
• Certain medications or medical conditions (illnesses) reduce its absorption.

A simple blood test is all that's needed to assess your status. This is often the first step before considering personalized supplementation.

How to Maintain Your Vitamin D Levels

Sunlight remains the primary source, but it is often insufficient on its own, particularly during the winter months and due to our sedentary lifestyles. Foods rich in vitamin D—such as fatty fish, eggs, and fortified products—can contribute to our intake but do not fully meet our needs.

Supplementation remains the most appropriate solution, particularly during perimenopause. Vitamin D3 supplements are recommended, and the dosage should be tailored to each individual’s biological status, which is why it is important to check one’s vitamin D levels.

Combining vitamin D3 with vitamin K2, as well as magnesium (and calcium), is a logical approach to maximizing bone health benefits. Magnesium plays a role in every stage of vitamin D metabolism and transport. This mineral is particularly crucial for promoting the formation of the active form of vitamin D (calcitriol). Vitamin K2 works synergistically with vitamin D3 to direct calcium to the bones and teeth. It also enhances the cardiovascular protective effect of vitamin D.

Key takeaways

Vitamin D is one of the most extensively studied nutrients in the context of perimenopause. Its effects on bones, muscles, the brain, metabolism, and the cardiovascular system make it a valuable natural support during this transition.

It doesn't solve everything, and it's part of a comprehensive approach. But checking your vitamin D levels and addressing any deficiency is one of the simplest and most effective steps a woman can take to look after herself during perimenopause.

Vitamin D3 supplementation combined with magnesium and vitamin K2 is an ideal—and even essential—combination.