D-1,000 gives vitamin D3 for bone, muscle and immune support, helping you stay strong and resilient day to day with healthier teeth and calcium uptake in mind. This capsule packs vitamin D3 and clean, supportive ingredients, designed to keep things simple and effective. The brand, Thorne Research, is trusted by health pros for quality and transparency. It’s a dependable dietary supplement you can rely on.

Available Sizes & Variants:

90 vegetarian capsules – daily, easy to use vitamin D3 capsules for steady support.

Benefits & Features:

• Supports bone health with steady vitamin D3 delivery.
• Helps calcium absorption for healthier teeth and bones.
• Immune support is built in as vitamin D helps keep normal immune function.
• The star ingredient, vitamin D3, comes in a vegetarian capsule designed for easy daily use and reliable absorption with no unnecessary additives or fillers.
• Manufactured in a US facility under good manufacturing practices with thorough testing for purity and potency.

Thorne Research's commitment to purity runs through every bottle. Built on collaboration with clinicians and rigorous in-house testing, Thorne avoids premixed materials and instead makes micro dose dilutions for greater traceability. The brand's Mayo Clinic partnerships and long standing focus on safety make it a trusted choice for vitamin D supplements. This product sits squarely in that tradition, offering a high quality dietary supplement you can count on for everyday wellbeing.

Vitamin D (as Vitamin D3) (1,000 IU), Microcrystalline Cellulose, Hypromellose (derived from cellulose) capsule, Leucine, Silicon Dioxide, Vitamin E (d-Alpha Tocopheryl).

• GTIN: 693749128014
• Manufacturer: Thorne
• Categories: Best SellersNew ArrivalsPopular Supplement BrandsSubscribe & Save ProductsThorne Supplements
• 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.

Take 1 capsule up to three times daily, or as directed by your healthcare professional. Take 1 capsule 1 to 2 times daily\, with or between meals.

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 nutrient essential for supporting normal bone and immune function. This form is the bioactive version commonly used in supplements to help maintain daily vitamin D status.

This form is the standard cholecalciferol utilised in many vegetarian capsules to provide a stable source of vitamin D3 for daily intake.

What Does Vitamin D3 Do?

Vitamin D3 helps regulate calcium absorption, supporting bone structure and calcium utilisation. It also plays a role in supporting immune function in line with NHS and EFSA recommendations.

EFSA and NHS guidance emphasise vitamin D’s involvement in maintaining normal bone and immune system function as part of a balanced diet.

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

Thorne Research is Welzo’s chosen manufacturer for D-1,000 because of a long-standing reputation for purity, transparency and evidence-based formulations. This brand is widely regarded in the industry for high-quality, clinically oriented products and a track record of collaborating with respected medical institutions, including Mayo Clinic. Their commitment to using pure ingredients without unnecessary additives underpins their trusted standing among health professionals. Thorne operates in a cGMP-certified facility in the United States, with in-house purity and potency verification and strict avoidance of premixed raw materials in favour of self-prepared ingredient blends. This approach supports traceability and safety, with routine testing for allergens and contaminants, reinforcing their market distinction. To understand how we evaluate quality, explore our rigorous testing protocols and our expert team of doctors, nurses, and nutritionists.

Thorne’s UK market fit is founded on consistent product integrity and a science-led manufacturing philosophy, aligning with Welzo’s standards for quality assurance. Our partnership with Thorne was driven by our comprehensive brand vetting process, wherein our team assessed credibility, manufacturing standards and supplier transparency to ensure long-term reliability for this vitamin D3 supplement.

For more on how we verify quality, see our expert team of doctors, nurses, and nutritionists and our rigorous testing protocols.