Vitamin A (Retinol)

Vitamin B6 is required for carnosine and other imidazole metabolite synthesis. B6 deficiency reduces carnosine production from beta-alanine and histidine.

Ensure adequate vitamin B6 status if supplementing with beta-alanine for carnosine synthesis.

Zinc is required for Vitamin A mobilization from liver stores and for the synthesis of retinol-binding protein. Zinc deficiency impairs Vitamin A transport and utilization even when Vitamin A stores are adequate.

Ensure adequate zinc status when supplementing Vitamin A. Can be taken together.

Selenium and vitamin A work synergistically to prevent cancer, with both micronutrients enhancing each other's antioxidant and anticarcinogenic effects.

Selen und Vitamin A wirken im antioxidativen System zusammen und können sich gegenseitig beeinflussen. Beide Nährstoffe sollten im normalen Dosierungsbereich bleiben (Vitamin A max. 3.000 µg/Tag, Selen max. 300 µg/Tag).

High-dose retinol can reduce Vitamin D signaling through competition for the RXR co-receptor. However, this competition is dose-dependent and ligand-specific — at normal supplementation doses the interaction is minimal. Only relevant at very high retinol intake (>10,000 IU/day).

Avoid excessive Vitamin A supplementation (>10,000 IU) when taking Vitamin D3. Moderate intake of both is generally safe.