Vitamin D3 – Reflex Nutrition
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Vitamin D3

£6.99 £4.89

100 servings

£0.04/serving

Train through every season. D3 fills the gap when sunlight can't.

  • Immune system support

    So you are stronger than ever

  • Maintains muscle function

    Rely on your body when you need it

Each capsule delivers 50µg (2000IU) of Vitamin D3 – the same form your body naturally makes from sunlight. It supports bone strength, contributes to muscle function, and supports the immune system.

What 50µg (2000IU) actually means?

- 50µg (micrograms) is the actual amount of vitamin D in the capsule.
- 2000 IU (International Units) is another way of measuring the same amount.

When sunlight is limited, D3 helps keep those fundamentals solid – so you can train harder and stay resilient, day after day.

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    PRODUCT INFORMATION

    Each capsule delivers 50µg (2000IU) of Vitamin D3 – the same form your body naturally makes from sunlight. It supports bone strength, contributes to muscle function, and supports the immune system.

    What 50µg (2000IU) actually means?

    - 50µg (micrograms) is the actual amount of vitamin D in the capsule.
    - 2000 IU (International Units) is another way of measuring the same amount.

    When sunlight is limited, D3 helps keep those fundamentals solid – so you can train harder and stay resilient, day after day.

      HOW TO USE

      Take one capsule daily with food. Each capsule provides 50µg (2000IU) of Vitamin D3.

      This product is a food supplement and should be used in conjunction with a varied and balanced diet and a healthy lifestyle, not as a substitute for such. Do not exceed the stated daily dose. Not intended for use by anyone under 16. Keep out of reach of young children.

      NUTRITIONAL INFO

      50µg (2000IU) per capsule- a higher daily dose for simple, reliable support. Delivered in the same form your body naturally produces from sunlight.

      DELIVERY & RETURNS

      Free Standard Delivery on UK Orders Over £50.00
      UK Standard (5-7 working days) £4.00
      UK Next Day
      Delivery £6.00
      Jersey, Guernsey & Isle of Man £16.99
      Click here for Delivery Information

      BONES THAT LAST

      For more than 30 years, we’ve built nutritional systems that support your capability for years to come

      FROM STRONG TO STRONGER

      Daily support for your bones, strength, movement, and staying on track. Can help you stay consistent with your routine, whatever the day looks like.

      QUALITY YOU CAN RELY ON

      From our facility in Brighton, we’ve delivered the same high standards for more than two decades. We only believe in the highest grade minerals, so that's what we use.

      A DOSE THAT DELIVERS

      Good nutrition should make you feel more in control, not more confused. So we keep things clear, using effective ingredients at scientifically-backed doses. Products built to help you stay capable for longer. Because you’ve still got it and we’re here to help you prove it.

      Learn more about

      Vitamin D3

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      PRODUCT INFO

      Vitamin D3 supports the foundations your body relies on every day. It contributes to calcium absorption for strong bones and teeth, supports muscle function, and supports a healthy immune system.

      Your body makes Vitamin D3 from sunlight, but in the UK that’s often in short supply – especially with long hours indoors or during darker months.

      Each capsule delivers 50µg (2000IU) in the same form your body produces naturally – a reliable way to keep bones strong, muscles working, and your immune system ready year-round.

      UNDER THE SURFACE

      Shorter days, long hours indoors, and heavy training all reduce the amount of Vitamin D your body can make from sunlight.

      In the body, Vitamin D isn’t just stored – it’s converted in the liver and kidneys into its active form, calcitriol, which acts like a hormone to switch on key processes. It helps your gut absorb calcium and phosphorus for strong bones and teeth. It supports healthy muscle contraction through calcium control. And it primes immune cells so they respond when you need them.

      With steady D3 intake, you close that gap. In the short term, that means your bones absorb the minerals they need, your muscles work more effectively, and your immune system stays responsive.

      Over time, those benefits build into stronger bones, sustained muscle function, and immune defences that stay active year-round. That’s the foundation of lasting capability: keeping your fundamentals solid so you can train harder, recover better, and stay resilient.

      HOW TO USE

      Take one capsule daily with food. Each capsule provides 50µg (2000IU) of Vitamin D3.

      This product is a food supplement and should be used in conjunction with a varied and balanced diet and a healthy lifestyle, not as a substitute for such. Do not exceed the stated daily dose. Not intended for use by anyone under 16. Keep out of reach of young children.

      INGREDIENTS

      In each two-piece Bovine Gelatin Capsule: Bulking Agents (Maltodextrin, Microcrystalline Cellulose), Hard Gelatine Capsule (Bovine Gelatine), Vitamin D3 (Cholecalciferol), Anti-caking Agents (Calcium Silicate, Magnesium Stearate, Silicon Dioxide). May contain traces of fish, crustaceans and/or milk.

      Frequently Asked Questions

      What you need to know

      Vitamin D helps regulate the amount of calcium and phosphate in the body. These nutrients are needed to keep bones, teeth and muscles healthy. A lack of vitamin D can lead to bone deformities such as rickets.

      Because your body produces vitamin D from sunlight, daily intake can be useful when exposure is limited, helping you keep your intake steady and your routine consistent throughout the year.

      In simple terms:

      - It can help maintain bones, muscles, and everyday function
      - Can support normal immune system function
      - Can assist with staying consistent when sunlight (and natural vitamin D production) is lower

      This makes it a straightforward way to support your daily intake, especially during months with less sunlight.

      Possible symptoms of low vitamin D3 levels include:


      - Muscle pain
      - Bone pain
      - Increased sensitivity to pain
      - A tingly, “pins-and-needles” sensation in the hands or feet
      - Muscle weakness in body parts near the trunk of the body, such as the upper arms or thighs
      - Waddling while walking, due to muscle weakness in the hips or legs

      You can take a vitamin D3 capsule daily. Taking a vitamin D3 supplement may help improve bone health.

      Do not exceed the stated daily dose. Not intended for use by anyone under 16. Keep out of reach of young children.

      Yes, items purchased using a discount code or as part of a promotion can still be returned, provided they meet the returns criteria. This means items must be unused and in their original, resellable condition, exactly as you received them. Pack them securely in appropriate packaging to protect them in transit.

      Yes, you have the right to cancel your order within 14 days from the date you receive your items, without needing to give a reason.

      You have 14 days from the date of delivery to cancel your order under your cooling-off period rights. This allows you to change your mind about your purchase and return the item, provided it is unused and in its original, resellable condition.

      To arrange a return or refund, please contact our Customer Service team via email on info@reflexnutrition.com or call 01273 303817 with your order number and delivery address, and we will guide you through the next steps.

      Yes, return shipping is your responsibility to arrange and pay for.


      If a delivery fails or you don't collect your parcel and it comes back to us, additional charges may apply.

      Refunds go back to your original payment method once we've received and processed your return. Timings vary by payment provider; your bank or card issuer will confirm the exact date.

      If there is an issue with your order, please contact our Customer Service team via email info@reflexnutrition.com or call 01273 303817 with your order number and delivery address as soon as possible so we can investigate and resolve the issue.

      Items must be unused and in their original, resellable condition, exactly as you received them. Pack them securely in appropriate packaging to protect them in transit.


      We can't accept returns that arrive damaged due to poor packaging.

      We are unable to accept returns for certain items where it would not be suitable for resale, such as products that have been opened, used, or are not in a resellable condition.

      If you no longer have your receipt or order confirmation, please contact our Customer Service team via email info@reflexnutrition.com or call 01273 303817 with as much information as possible (such as your name, email address, or delivery postcode), and we will do our best to locate your order.

      Replacements or exchanges will be processed once your returned item has been received and inspected. Delivery times for replacements will follow standard shipping timeframes.

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