Women enjoying life, vitamin d hero photo

Ingredient Repository · Ingredient

Ingredient

Vitamin D3 for bones, mood and immunity, delivered by live probiotics.

The sunshine vitamin essential for strong bones, healthy teeth, immune defence, and gut barrier strength.

What it is

Vitamin D3 (cholecalciferol) is the natural form of vitamin D that your body produces when sunlight touches your skin. It acts like a key hormone that helps your body absorb calcium and maintain a strong immune system.

In Velobiotics formulations, Vitamin D3 is combined with micro-shielded probiotics to ensure stable delivery and optimal absorption in your gut.

Also known as: Cholecalciferol, Vitamin D

Key benefits

  • Helps your body absorb calcium and phosphorus so you maintain strong bones and teeth.
  • Supports immune defence by helping your white blood cells respond to daily challenges.
  • Strengthens your gut barrier lining so unwanted substances stay out of your bloodstream.
  • Promotes healthy muscle function and overall inflammation balance.

Amplified by probiotics

Vitamin D3 and friendly probiotics form a supportive partnership in your gut. Good bacteria produce nourishing compounds like butyrate (a compound that feeds your gut lining), which turn on Vitamin D receptors (docking points on your cells) in your gut lining so your body can respond to Vitamin D3. In turn, Vitamin D3 encourages your gut lining to build strong tight junctions, creating a healthy home for friendly bacteria. Probiotic enzymes also help mix Vitamin D3 with healthy fats so it absorbs easily across your gut wall.

Typical dose

400–2000 IU/day (10–50 µg/day)

The evidence

Evidence: strong

Many human studies show that taking vitamin D3 improves bone strength, reduces infection risk, and supports gut barrier function. Combined probiotic and vitamin D3 interventions show additive benefits in metabolic and inflammatory parameters. (Charoenngam et al. 2020, Nutrients; Jones et al. 2013, J Clin Endocrinol Metab; Shang et al. 2021, Front Immunol)

  1. Charoenngam N, Holick MF. Immunologic Effects of Vitamin D on Human Health. Nutrients. 2020;12(7):2097 PubMed ↗
  2. Jones ML, et al. Oral supplementation with probiotic L. reuteri NCIMB 30242 increases circulating 25-hydroxyvitamin D: a randomized controlled trial. J Clin Endocrinol Metab. 2013;98(7):2744-2751 PubMed ↗
  3. Shang Q, et al. Gut Microbiota-Mediated Molecular Mechanisms in Vitamin D Absorption and Metabolism. Front Immunol. 2021;12:633519 PubMed ↗

Safety & who should check first

Highly tolerable within established upper intake levels (4000 IU/day for adults). Pregnant and lactating women should consult a healthcare provider for tailored dosing. High doses require monitoring if co-administered with thiazide diuretics or cardiac glycosides.