15% off your first subscription blood test. Discount auto-applied at checkout.

Vitamin D supplements

Premium vitamin D3 1000 IU (25 µg) High-quality, plant-based supplement Treats vitamin D deficiency Supports your bones and immune system Can support your mood Can help PCOS symptoms
4.5 stars
Rated “Excellent” based on 2,189 reviews
Peter Goring, Thriva user
“I’ve been consistently using Thriva supplements over the last 6 months. Vitamin D was recommended to me after my Thriva test showed I had low levels. My levels have increased in accordance with my taking them, which I’m happy with and I do think they are higher quality than others on the market.”

Vitamin D keeps the sun shining all year round

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Improve your mood

Vitamin D deficiencies may affect your mood and make you feel down. If this is the case, a supplement might help.

Support your immune system

Vitamin D supports your immune system to help fight off illnesses like the common cold and other viruses.

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Strengthen your bones and muscles

Vitamin D helps you absorb more calcium from your food, contributing to healthier bones, teeth, and muscles.

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Improve PCOS symptoms

Vitamin D can help improve testosterone levels and regulate your menstrual cycle if you suffer from PCOS.

1 in 6 adults in the UK have low vitamin D levels in their blood. It’s a widespread deficiency associated with many conditions — like bone pain (osteomalacia), weak bones (osteoporosis), depression, and an increased risk of type 2 diabetes.

You can quickly correct a vitamin D deficiency by taking a supplement. Our supplements are great at keeping your bones, muscles, and brain healthy and happy!“

— Vishal Shah MBBS MA (Cantab) MRCGP

Chief Medical Officer

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Stop guessing, start tracking your vitamin D

Regular blood tests are the best way to see the effect your vitamin D supplements are having.

Order a vitamins blood test and see how your supplements have affected your vitamin D levels. We’ll offer you a 10% discount after you purchase your supplements.

We’ll send you your results with expert advice from a GP on what steps to take next.

Woman holding glass of water and placing vitamin D supplement into her mouth

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