Vitamin D3® + K2— The Supplement the UK Can't Afford to Skip.
5,000IU D3 and 133% RDA Vitamin K per capsule. Immune function. Muscle function. Bone health. One capsule daily. Stronger bones. Everyday immunity. One simple capsule.
Your daily dose of sunshine—now made even better.
Vitamin D is essential for strong bones, healthy muscles and everyday immune support—but in the UK, getting enough from sunlight alone isn’t always easy.
Bio-Synergy Vitamin D3 + K2 combines a powerful 5,000 IU of vitamin D3 with 100 µg of vitamin K2 in one convenient capsule.
Vitamin D helps your body absorb calcium, while vitamin K helps support its use within your bones. Together, they make a smart daily combination for anyone looking after their strength, mobility and long-term bone health.
One capsule a day. A full 90-day supply. No unnecessary complication.
Best for
People who get limited sunlight
Supporting bone health as you age
Active people looking after muscles and mobility
Anyone wanting D3 and K2 in one simple capsule
Everyday use during the darker winter months
Why it works
Vitamin D3 — Cholecalciferol (5,000IU — 2,500% NRV) Contributes to normal immune function, muscle function and the maintenance of normal bones.
Calcium (175mg — 22% NRV) Works with Vitamin D to support normal bone density and mineralisation.
Phosphorus (135mg — 20% NRV) Essential mineral for bone health and energy metabolism.
What makes it different
5,000 IU high-strength vitamin D3
Now with 100 µg of vitamin K2
Supports strong bones and healthy teeth
Helps maintain normal muscle function
Supports everyday immune health
Helps your body absorb and use calcium
Ideal during winter or limited sun exposure
One capsule daily
90-day supply
How to Use
Take one capsule daily with a meal, ideally one containing some healthy fats.
Since 1997 Bio-Synergy has been setting standards in sports nutrition. Certified B Corporation®. Made in the UK. Independently tested. Used by elite and professional athletes for over 25 years.
Take one capsule daily with water. Do not
exceed the recommended daily dose.
Why you'll love it
✓ KEEPING BONES STRONG ✓ SUPPORTING EVERYDAY IMMUNITY ✓ MAINTAINING HEALTHY MUSCLE FUNCTION ✓ GETTING MORE FROM YOUR CALCIUM ✓ STAYING SUPPORTED WHEN SUNLIGHT IS LIMITED ✓ JUST ONE CAPSULE A DAY
Did You Know?
Vitamin D3 is essential for calcium absorption and maintaining healthy bones, as well as supporting immune function.
Is This Product Right for You?
Perfect for anyone looking to support their bone health and immune system, particularly those with limited sun exposure.
Discover More
Explore our range of essential vitamins and supplements including Vitamin C Capsules and Immune Booster Capsules.
Quality Assured
Produced in the UK with high-quality ingredients to ensure effective and safe supplementation.
How to Take
Take one capsule daily with water. For best results, incorporate into your daily routine to support bone health and immunity.
Storage
Keep the container sealed, out of direct sunlight, and out of reach of children. Best before see base.
Absolutely. All our supplements undergo rigorous testing for safety and efficacy. We adhere to the highest standards to ensure our products are free from banned substances, making them safe for athletes at all levels.
How do I know which Bio-Synergy supplement is right for me?
Our product range is designed to cater to various fitness goals, whether it's building muscle, losing weight, or enhancing endurance. For a more personalised approach we recommend a Bio-Synergy DNA test to identify the best supplement for you.
Can I take Bio-Synergy supplements with other medications?
While our supplements are safe, we recommend consulting with your doctor before starting any new supplement regimen, especially if you are currently taking other medications.
How should I store my Bio-Synergy supplements?
Keep your supplements in a cool, dry place away from direct sunlight. Make sure the cap is tightly sealed after each use to maintain their potency and freshness.
What is the return policy for Bio-Synergy supplements?
We stand behind the quality of our products. If you are not satisfied with your purchase, you can return it within 30 days for a full refund. Please visit our return policy page for detailed information.
Do Bio-Synergy supplements have any side effects?
Bio-Synergy supplements are designed to be safe and effective when used as directed. However, as with any supplement, some people may experience side effects. If you experience any adverse effects, stop use immediately and consult a healthcare professional.
How long does it take to see results from Bio-Synergy supplements?
Results can vary based on individual factors like diet, exercise, and overall health. Some may notice benefits immediately, while for others, it might take longer. Consistency and a healthy lifestyle are key to achieving the best results.
Are there any discounts available for buying Bio-Synergy supplements?
We often offer promotions and discounts. Check our website regularly, sign up for our newsletter, or follow us on social media to stay updated on our latest deals.
How long does delivery take?
Delivery is next day in the UK Monday-Thursday and 48-72 hrs at weekends. For international delivery, times will vary but generally within 7 working days
