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Did you know that thanks to our glorious British weather, vitamin D deficiency is one of the most common nutritional deficiencies in the UK?
An estimated 30% of Brits have low levels of vitamin D in winter (and 10% in summer), and unless you live in the Caribbean all year round, the chances are you may not be getting enough.
A key nutrient for keeping your immune system functioning normally, vitamin D helps to support your bones, teeth and muscles and is created when your skin is directly exposed to sunlight. This means it can be difficult for your body to produce enough here in the UK to fully support your immune system.
Natural food sources of vitamin D usually aren't enough to boost our levels significantly, which is why the NHS now recommend everyone to consider taking a vitamin D supplement to help to boost their levels - especially during the winter months.
In this guide we cover everything you need to know about the "sunshine vitamin", plus what to look for when shopping for a good quality supplement...
What Is Vitamin D?
Vitamin D is synthesised naturally from cholesterol when your skin is directly exposed to sunlight. Unlike other vitamins, it functions like a hormone - meaning that every cell in your body has a receptor for it.
It's one of the most powerful nutrients for the human body and is vital for bone health, muscle health, mood & immune system function.
Vitamin D deficiency is surprisingly common in the UK due to our lack of sun exposure, and it's estimated that around 1 billion people worldwide may have low levels of vitamin d in their blood.
The most accurate way to know whether you may be deficient is to speak with your GP or health practitioner, who can take a blood test to check your levels.
If you find yourself becoming sick quite often (particularly with with colds or flu), then low vitamin D levels could potentially be a contributing factor.
While food sources such as fatty fish or fortified dairy products are rich in vitamin D, some people may want to consider taking a vitamin D supplement - especially during the colder months.
Vitamin D Benefits
Immunity
Mood
Bones
Muscles
Teeth
Hormonal Balance
Vitamin D Supplements: What To Look For
With so many options out there it can be extremely hard to distinguish which brands are effective.
Let's take a closer look at some of the important things to consider when it comes to shopping for a quality product...
Vitamin D3, Not D2
Vitamin D supplements are made with either ergocalciferol (vitamin D2) or cholecalciferol (vitamin D3). Research suggests that vitamin D3 is more important for our overall health than vitamin D2. While both forms can increase levels of vitamin D effectively, studies show that vitamin D3 increases levels more significantly and for longer. We'd recommend choosing a supplement formulated with vitamin D3 for the best chance of results.
Vitamin K2
Look for a vitamin D supplement which also contains vitamin K2. This perfect pairing work synergistically in partnership and promote calcium accumulation in your bones, while reducing harmful accumulation in soft tissues. Look for a supplement containing the MK-7 form of vitamin K2 which is the natural & most effective form.
Money Back Guarantee
It's important that any manufacturer stands behind their product and is willing to give your money back if you aren't happy with the results. Many manufacturers now offer an extended returns policy or 100% satisfaction guarantee for as long as 30 or 60 days. This gives you plenty of time to try the supplement "risk free" to make sure it's what you're looking for.
Prioritise Quality
It's vital to prioritise quality when searching for a high quality vitamin d supplement, even if that means paying a bit more for a high quality, pure and safe product, with premium quality ingredients. You typically get what you pay for when it comes to buying supplements.
Avoid Fillers & Additives
Read the back label of any supplement carefully and watch out for any sketchy fillers or additives. Avoid any unnecessary ingredients or bulking agents such as magnesium stearate, titanium dioxide, starch, iron oxide, or microcrystalline cellulose which don't offer any nutritional benefit.
#1 Vitamin D Pick For 2025: Puro Vitamin D3 + K2 by Purolabs
For its ultimate combination of high potency vitamin D paired with vitamin K2, Puro D3 & K2 is going to be the best bet for most people.
Each capsule delivers 3000iu of high strength D3 to boost your immune system plus 100iu of vitamin K2 (as MK-7) to ensure calcium is absorbed to the right places & to help support healthy bones, teeth & muscles.
Unlike most supplements, this product is also 100% free from sketchy additives, fillers & bulking agents.
But what really sets it apart is the truly comprehensive 60 day, 100% satisfaction guarantee - allowing you to try the product risk-free for 60 days to ensure you experience the benefits.
Why You'll Love Puro Vitamin D
3000iu of premium quality vitamin D3 (one of the strongest formulas available on the market)
Vitamin K2 as MK-7 (the superior & most effective natural form sourced from Japanese natto)
Made in the UK to the strictest quality & safety standards (GMP code of practice)
Ratings Breakdown
Quality
The commitment to quality is second-to-none. They focus on the highest-quality, most clinically-tested ingredients without the usual additives or fillers commonly found in most supplements.
Quality
The commitment to quality is second-to-none. They focus on the highest-quality, most clinically-tested ingredients without the usual additives & fillers found in most supplements.
Value
You can definitely find vitamin D supplements cheaper -- but if you want true value for money, we think it's worth the investment in your health.
Value
You can definitely find vitamin D supplements cheaper -- but if you want true value for money, we think it's worth the investment in your health.
Customer Experience
The website is easy to navigate; the delivery is fast and free; and the items come well-packaged. Customer feedback is excellent.
Customer Experience
The website is easy to navigate; the delivery is fast and free; and the items come well-packaged. Customer feedback is excellent.
Brand
While a relative newcomer, the brand has been on the scene for a couple of years now, slowly building their reputation for quality products with premium ingredients
Brand
While a relative newcomer, the brand has been on the scene for a couple of years now, slowly building their reputation for quality products with premium ingredients.
Perks
The product comes with a truly risk-free 60 day 100% satisfaction guarantee so you can try the product first to ensure it's suitable for you.
Perks
The product comes with a truly risk-free 60 day 100% satisfaction guarantee so you can try the product first to ensure it's suitable for you.
Shop Our #1 Pick
Puro Vitamin D3 + K2 by Purolabs
Other Options Worth Considering:
Core Nutrition - D3 & K2 Spray
This vegan-friendly spray from Core Nutrition offers good value & delivers a potent dose of D3 & K2 in a highly absorbable form. Each bottle contains around 120 servings (a 4 month supply) and delivers 2000iu (50mcg) of Vit D and 25mcg of K2
The formula is free from GMOs, gluten, preservatives, hormones and artificial flavours, colours and sweeteners—but the strong orange taste won't be for everyone, and you may prefer the convenience of tasteless capsules instead.
Weightworld Lipsomal D3 & K2
This liquid form supplement from Weightworld is a refreshing way to get your daily sunshine dose. The mixed berry liquid tastes great and also can be mixed into your water or even your favourite drinks if you're on the move.
Each serving contains 2000iu of vitamin D3 plus 75ug of vitamin K2 (as MK-7) that all contribute to the normal function of the immune system - as well as maintenance of muscles, bones & teeth. A bottle lasts for around 50 days and is currently priced at £17.99.
Maxmedix Vitamin D3 Gummies
Looking for a vitamin D supplement for your little ones? Then these D3 gummies are for you. This kid-friendly option is suitable for children 4 years and over - providing 1000iu of D3 via tasty orange-flavoured gummy vitamins.
While there's sadly no vitamin K2 & gummies are unavoidably higher in sugar & additives, the taste is one that your kids will absolutely love, and it also represents decent value at 120 gummies per bottle - enough to last around 4 months.
Dr Berg D3 + K2 Vitamin
This premium option from Dr Berg has gathered a bit of a cult following lately and is currently an Amazon bestseller.
With 120 capsules per bottle, each serving delivers 2000 IU of Vitamin D3 & 50 mcg of Vitamin K2 in a clean and fuss-free formula.
The formula isn't 100% additive-free, but on the whole this is another solid capsule-based option to help support immunity, bones, muscles & teeth.
Shop Our #1 Pick
Puro Vitamin D3 + K2 by Purolabs
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