Vitamin D and the gut microbiome – a bidirectional relationship

✨ Part 1 🔗 Vitamin D and the gut microbiome – a two-way relationship 1️⃣ Vitamin D → intestines

• The active form (calcitriol) binds to vitamin D receptors (VDR) in intestinal cells.

• The VDR stimulation:

• reinforces the barrier 🛡️

• reduces inflammation 🔥

• regulates the immune system ⚔️

• In case of deficiency → the barrier weakens → leaky gut → dysbiosis and chronic inflammation. 2️⃣ The intestine → vitamin D

• Bacteria in the colon (especially buturate-producing bacteria) affect VDR activity.

• Butyrate (SCFA):

• is energy for colonocytes ⚡

• enhances VDR expression

• improves vitamin D metabolism

👉 Without them, even the sun ☀️ or supplements 💊 do not work fully. ✨ Part 2 3️⃣ Deficiency and dysbiosis - a vicious circle 🔄

• ↓ Vitamin D → weakened defense → pathogens dominate 🦠 → ↓ butyrate-producing bacteria.

• ↓ Bacteria → weaker VDR activation → even weaker vitamin D metabolism.

➡️ Result: mass deficiency that is not always corrected by sun or supplements alone. 4️⃣ What should we do? ✅

• Fiber and prebiotics 🥦 (fruits, vegetables, legumes).

• Fermented products 🥒 (kefir, sauerkraut, kombucha).

• Sufficient sun ☀️ (regular but safe).

• Vitamin D supplement 💊 + probiotics and prebiotics.

• Minerals: magnesium, zinc and vitamin K2 ⚖️ → support metabolism. 📌 Conclusion:

Vitamin D and the microbiome work as a team 🤝.

Healthy gut = more effective vitamin D.

Sufficient vitamin D = healthy barrier and balanced microbiome.