Lamberts Vitamin D3 capsules are a high potency supplement that supports bone, immune and muscle health, providing a steady lift when sunlight is scarce. Made in Britain to GMP standards, Lamberts is well known for pharmaceutical-grade ingredients and transparent labelling. You can rely on the brand's longstanding pledge to safety, batch testing and clear information on every pack.

Available Sizes & Variants:

120 capsules – high potency vitamin D3 for everyday bone, immune and muscle support.

Benefits & Features:

• Supports bone health by aiding calcium absorption.
• Helps immune function by supporting immune cell activity.
• Maintains muscle function by regulating calcium in muscle tissue.
• Quality you can trust - Lamberts manufactures in the UK under GMP, tests every batch for contaminants, and maintains full traceability, reflecting the brand's longstanding commitment to transparency and safety.
• Ideal for daily use alongside a balanced diet.

From its UK GMP manufacturing to full batch testing, Lamberts stands out for pharmaceutical-grade ingredients and transparent labelling. Each capsule contains 4000 IU of vitamin D3, designed to support calcium absorption for bones and help immune function and muscle health. The brand's commitment to quality - through contaminant screening and strict traceability - sets it apart in the UK supplement scene.

• GTIN: 5055148409326
• Manufacturer: Lamberts
• Size: 4000iu / 120 Capsules
• Categories: Back to School Supplements & EssentialsLambertsOver the counter productsVitamin D
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Consume one tablet per day with food, or follow the guidance of a healthcare professional. Do not surpass the advised daily amount. Supplements are not a replacement for a balanced diet.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Vitamin D3 (Cholecalciferol)

Vitamin D3, also known as cholecalciferol, is a fat-soluble vitamin that helps balance minerals and keeps bones healthy.

This form is the natural cholecalciferol variant used to support normal bone, muscle and immune function; it is produced in the body when skin is exposed to sunlight and is also available as a dietary supplement.

What Does Vitamin D3 Do?

Vitamin D3 helps keep normal calcium and phosphorus absorption, supporting bone mineralisation and skeletal strength, and it also supports immune cell activity in line with NHS and EFSA guidance.

Dr. Bouillon from the University of Liège found that adequate vitamin D status is linked with functions that help support skeletal health and immune system activity.

This supplement is not intended to diagnose, treat, cure, or prevent any disease.

Lamberts is our chosen partner for Vitamin D3 because this brand delivers strict, open manufacturing and reporting standards that line up with Welzo’s commitment to safety and quality. This brand makes in the UK under Good Manufacturing Practice (GMP), with strict intake testing of all raw materials and traceability that meets or exceeds EU and UK food supplement standards. Lamberts is renowned for pharmaceutical‑grade ingredient standards, full‑disclosure labelling, and a long‑standing reputation for consumer safety and regulatory compliance, which our team recognises and values. For a deeper sense of brand credibility, Lamberts has a history of transparent product testing and informative packaging that supports trust in the marketplace.

This brand was evaluated by Welzo's healthcare professionals for compliance with our ingredient quality and purity standards. Lamberts Vitamin D3 is manufactured to GMP standards in the UK, and the product is formulated to support healthy bones, immunity and muscle function, as documented in the research into the product provided.

From a UK market perspective, Lamberts’ established reputation for credible labelling and contamination screening positions it well for Welzo’s product range. Our partnership reflects a shared commitment to rigorous testing, transparency, and regulatory alignment, ensuring a reliable, safety‑driven supply chain for this supplement.