Vitamin D3, K2 and Magnesium Supplements in the UK Compared

Looking for the best vitamin D3, K2 and magnesium supplement in the UK? The checks that matter are D3 as cholecalciferol, K2 as MK-7, a named magnesium form and independent test results you can read. NovusDNA Essential+ provides cholecalciferol, K2 as MK-7 and magnesium L-threonate, with a Campden BRI (UKAS No. 1079) testing summary published on its product page.

A combined D3, K2 and magnesium supplement is a single product that puts vitamin D3, vitamin K2 and magnesium into one daily serving, so you take one product instead of three. Below are six label checks to use, followed by five combined products you can buy in the UK, including the NovusDNA Essential+ 60-capsule pack.

NovusDNA is a UK longevity and health supplement brand that makes science-led, precision-formulated supplements, independently tested by a UKAS-accredited UK laboratory, for adults who want to support long-term health with clear, transparent formulas. NovusDNA sells one of the products compared here, so competitor details are limited to facts on retailer pages checked in October 2026. The formula and testing summary for Essential+ are on the NovusDNA Essential+ product page.

What each nutrient does, in authorised terms

Each nutrient has its own approved role, and putting all three in one capsule is mainly about convenience. These are the wordings permitted on the Great Britain nutrition and health claims register:

• Vitamin D contributes to the maintenance of normal bones, normal muscle function and the normal function of the immune system.

• Vitamin K contributes to the maintenance of normal bones.

• Magnesium contributes to a reduction of tiredness and fatigue and to normal muscle function.

For the background, see why vitamin D3 and K2 are often taken together. This article focuses on choosing a product.

How to choose: six checks before you buy

Check the vitamin D form and amount, the K2 form, the magnesium form, the testing evidence and vegan status, then compare packs on what is actually inside. Each check takes a minute on the label or product page.

1. Vitamin D3 as cholecalciferol

Look for vitamin D3, listed as cholecalciferol, rather than vitamin D2. The NIH Office of Dietary Supplements vitamin D fact sheet notes that both forms raise blood levels of vitamin D, but D3 raises them to a greater extent than D2.

2. Vitamin D in line with NHS seasonal advice

The NHS vitamin D page says everyone should consider a daily vitamin D supplement between October and early March.

Combined products vary in how much vitamin D they contain, so read the amount per daily serving and think about any other vitamin D you already take. See when UK adults should start taking vitamin D for the seasonal detail.

3. Vitamin K2 as MK-7

MK-7 is the K2 form used by every combined product in the shortlist below. The NIH vitamin K fact sheet reports that MK-7 supplements are well absorbed and have a longer half-life than vitamin K1 supplements, though it also notes that data comparing the forms are limited. 

On amount, the NHS vitamin K page says adults need about 1 microgram per kilogram of body weight a day, and that taking 1mg or less of vitamin K supplements a day is unlikely to cause any harm.

4. A named magnesium form

The label should say which magnesium compound is used, and Essential+ names its form in full: magnesium L-threonate. The NIH magnesium fact sheet notes that high doses from supplements often cause diarrhoea, so follow the directions on the label. For a side-by-side look at citrate, glycinate and L-threonate, see which magnesium form suits muscles and bones.

Amounts vary between combined products, so compare the magnesium per daily serving with NHS figures of 300mg a day for men and 270mg for women, and the NHS says 400mg or less a day from supplements is unlikely to cause harm. For more on the mineral itself, see what magnesium does as you get older.

5. Testing you can actually read

"Tested" means little unless you can see who tested the product, what they measured and what they found. Look for a named laboratory, its accreditation (in the UK, UKAS) and the actual results.

The NovusDNA guide on how to read a certificate of analysis walks through each section of a lab report, so you can check any brand's claims, including NovusDNA's.

6. Vegan status and what is in the pack

Vitamin D3 is not automatically vegan. The NIH vitamin D fact sheet explains that D3 is typically made from lanolin from sheep's wool, while an animal-free D3 sourced from lichen is also available. Look for a vegan statement covering the whole product, not just the capsule shell.

When comparing packs, compare capsules per pack, capsules per daily serving and any extra ingredients you may not want.

Five UK combined D3, K2 and magnesium supplements compared

All five products use K2 as MK-7, but they differ on daily serving, magnesium form, extra ingredients and how much testing information appears on the page. NovusDNA Essential+ is shown alongside four other UK options. Competitor details come from the retailer pages named and were checked October 2026.

NovusDNA Essential+ 

Essential+ suits people who want to see what an independent UK laboratory measured in the product before they buy. It is a vegan capsule, with the testing summary on the product page, explained in the next section.

DR.VEGAN Bone & Muscle Support

The medino listing, checked October 2026, lists each amount per two-capsule serving. It also contains calcium, which suits some buyers and not others.

DoNotAge Pure Vitamin D3, K2 & Magnesium

Uses magnesium L-threonate, the same form as Essential+. It was on pre-order for 1 November 2026 when checked.

Nutraconcepts Liposomal Vitamin D3 K2 Magnesium

A one-a-day liposomal capsule using magnesium citrate, described as vegan and UK made.

LifePlan D3 & K2 with Magnesium

The medino listing, checked October 2026, gives one capsule a day with food. Its magnesium comes from a marine source.

What the Essential+ testing summary shows

The Essential+ testing summary reports what Campden BRI, a UKAS-accredited laboratory (No. 1079), measured in the product in September to October 2025. You can open the published testing summary yourself.

The nutrient results confirm each nutrient was measured in the product. The microbiology rows screen for contamination, and the lab reported all parameters "within acceptable analytical limits for food-grade vitamin ingredients".

The published page carries a summary. Full certificates, including methods and accreditation scope, are available on request by emailing info@novusdna.com.

Safety checks before you start

Follow the directions on the label, speak to your GP first if you take warfarin or another anticoagulant, and check with a pharmacist before combining vitamin D or magnesium products.

• Vitamin D: follow the label directions, and avoid taking several vitamin D products at once without advice from a GP or pharmacist.

• Vitamin K and anticoagulants: the NIH states that vitamin K can have a serious and potentially dangerous interaction with anticoagulants such as warfarin. An NHS warfarin dietary advice leaflet asks patients to check with their doctor or pharmacist which supplements are safe alongside warfarin. Speak to your GP before taking any vitamin K supplement if you take an anticoagulant.

• Magnesium: the NHS says 400mg or less a day from supplements is unlikely to cause harm.

• Everyone else: if you are pregnant, breastfeeding, managing a medical condition or taking prescribed medicines, check with your GP or pharmacist first. Food supplements should not replace a varied, balanced diet.

FAQ

Do I need a vitamin D3, K2 and magnesium supplement all year?

Not necessarily. NHS advice is that everyone should consider a daily vitamin D supplement between October and early March, when people in the UK do not make enough vitamin D from sunlight. A year-round supplement is advised for some groups, such as people who are rarely outdoors.

The NHS also lists people who usually cover most of their skin outdoors, and notes that people with darker skin may need one too. Care home residents and people who are frail or housebound are included in the year-round group. Whatever you choose, follow the directions on the label.

Can I take a combined product alongside a multivitamin or separate vitamin D?

Speak to a pharmacist or GP first, as combining products adds to your total vitamin D intake. Check whether your multivitamin already contains vitamin D or magnesium before adding a combined product.

List every product you take that contains vitamin D, and take your labels with you so a pharmacist can check how the products combine.

Is vegan vitamin D3 the same as standard vitamin D3?

It is still vitamin D3; the difference is where it comes from. The NIH explains that most D3 is made from lanolin from sheep's wool, while animal-free D3 is sourced from lichen. A vegan product should use the lichen-derived form and say vegan on the whole product.

Some products state that only the capsule shell is vegetarian or vegan, which does not tell you about the vitamin D source. If the label is unclear, ask the brand directly where its D3 comes from. Essential+ is labelled vegan as a whole formulation.

Can I see NovusDNA's full laboratory certificate for Essential+?

Yes. The product page publishes a testing summary from Campden BRI, and the full certificates, including test methods and accreditation scope, are available on request by emailing info@novusdna.com.

When you receive it, check the laboratory name and accreditation number match the summary, then compare the nutrient and microbiology results. The Essential+ summary covers vitamin D3, vitamin K2, magnesium, coagulase-positive Staphylococci, yeast, mould and Salmonella.

Look for a combined supplement that uses D3 as cholecalciferol and K2 as MK-7, names its magnesium form and lets you see how it was tested. NovusDNA Essential+ is a vegan D3, K2 and magnesium capsule with a results summary from Campden BRI, a UKAS-accredited UK laboratory, published on its product page.

Next step: See NovusDNA Essential+ and its testing summary, available in 30 and 60-capsule packs. If you want a fuller daily routine, the Foundation Stack brings Essential+ together with Longevity+ and Metabolic+. You can find more NovusDNA foundational health guides in the same collection.