Give your immune system a boost with the best vitamin D supplements

Nutri Advanced's 30ml D3 with K2 drops combines vitamin K2 with D3, which contributes to maintaining healthy bones. It easily absorbs, because it's in drop form. Take once or twice daily by applying three drops directly to the tongue or in water. Our tester comments: "The most common consensus I have had from the consultations is that drops are the best way to absorb vitamin D and that the supplement should contain a D3 K2 combination."

One thing to note is that these D3 drops contain Cholecalciferol which is usually derived from sheep's wool, so it may not be suitable for vegans.

Our tester was impressed by the results of taking this vitamin D supplement. She comments: "I believe it has really increased my energy levels and strengthened my immune system." In addition, it tastes pleasantly of oranges; just take three drops on the tongue daily.

If you are looking for an excellent value product, this supplement contains 365 compact tablets in a letterbox-friendly, eco-conscious pouch. Nutrition Geeks offers a high-quality vitamin D supplement in an easy-to-swallow 6mm pill form. A customer comments: "Lovely small tablet size makes it easy to swallow … very good price for a whole year's supply."

It delivers a large vitamin D dose without any aftertaste and provides a six-month supply for a little over £3. If you are looking for a supplement that's eco-friendly and affordable, this is the one.
The NHS advise that we should all take a vitamin D supplement, and with this one, you'll hardly notice the cost or that it takes up any space in your vitamin drawer.

A customer advises that you should only take this vitamin with water. Coffee and tea stops it being absorbed by the intestines.

Viridian's reputation as one of the cleanest supplements on the market. Their D3 and K2 supplement offers a balanced blend of two essential nutrients that helps support your bone health, the immune system and so much more. A customer comments: "Long use by date, and I am very pleased with that."

A real bonus is that their vitamin D3 is plant-sourced, and the K2 is derived from fermented natto cultures – making it a good choice for those with a vegan lifestyle.

The great benefits lie in the combination and natural sourcing of the D3 and K2 vitamins – making it an excellent pick in liquid drops and spray form. Our tester said that both the drops and the spray are easy to take and taste pleasantly of oranges. It provides a mood boost along with its benefits to bones, muscles and the immune system.

Customers notice the different to their health, as one comments: "I’m using this to help my arteries and heart declassify. The product is easy to swallow with no odd reactions in my stomach etc."

In a scientific study, this food-grown Vitamin D supplement claims to be 100% better absorbed than the leading capsule and high street spray. It's a naturally sourced D3 supplement that contains 1000IU per capsule and is more bioavailable than synthetic alternatives. It helps maintain calcium absorption to maintain good bone strength and muscle function.

Customers comment that this is a very effective supplement. And like our tester, they thought the packaging was top-notch, with a classy glass jar and minimalist style, that makes it an elegant gift idea. Taking a daily capsule can go some way to reducing the January blues and SAD that effects so many people during the long winter months in northern countries. Our tester tried it for a month and felt it helped improve their energy levels. They loved the quality of the product and that refills are available so that the jar can be reused.

Yes, this is more expensive than high street supplements but customers confirm this does boost the immune system.

It's fun to take your vitamins when they taste this good. NaturesPlus Vitamin D gummies are an assortment of mixed berry and orange flavours. You get two months' supply in a bottle. Each gummy contains the equivalent of 1,000IU.

Customers (and our tester) love the taste and texture of the gummies, and they deliver an all-important dose of vitamin D in a fun form. Whilst there's higher doses of vitamin D available in other supplements, these are a lovely gummy and an alternative to swallowing pills.

Boost your mood, support your immune system and bone health with a high potency vitamin. Expect to feel the benefits in a month of taking a daily gummy.

DR. VEGAN is known for its range of high-quality supplements made from plant ingredients, and this vitamin D supplement is no different. The capsules are housed in compostable packaging, and the product itself is vegan, easy to swallow, halal and free from gluten, dairy and lactose – making it an all-around winner for any dietary requirements.

It is a high-dose supplement with 2,500IU per pill, contributing to a healthy immune system and calcium absorption – which can be a nutritional area to address if you have a plant-based diet.

Our tester took the supplement on holiday and the packet weighed next-to-nothing in her bag. Having tested DR. VEGAN Vitamin D3 for a month, Natalie felt her mood has improved and muscle-ache has reduced. The daily capsule was easy to swallow and didn't leave an aftertaste.

We recommend this supplement for travelling in northern countries where vitamin D deficiency is a problem. Also, if you're looking for a supplement that suits a wide range of dietary requirements, this is a top ethical and sustainable choice. Finally, the packaging takes up next-to-no space and is lightweight – it's so much easier to store than a bottle.

As we get older, we need to take extra care, especially if you have an indoor lifestyle. We recommend this Healthspan Vitamin D because of its high strength and addition of cold-pressed extra virgin olive oil to help your body absorb the vitamin D3.

Our tester commented that these are small capsules that are easy to swallow and works out to be 9p per capsule, so it's excellent value for money. Each capsule contains a dose of vitamin D3 that's equal to 2000IU. It's a high-strength dose that's aimed at people aged 50+ and should be taken daily throughout October to March. Customers like that the packet is letterbox friendly and Healthspan delivers orders fast.

If you live in northern countries, it's vital to supplement your diet to ensure you're getting enough vitamin D3 to support muscle and bone strength.

With 5000IU per capsule, Bio-Synergy Vitamin D3 is a concentrated dose of the sunshine vitamin. D3 helps you absorb calcium and phosphorus and these keep your bones strong.

Natalie says: "I've been taking these in conjunction with Magnesium Citrate as I watched some research that said vitamin D uses the body's magnesium reserves to absorb, so for optimal release take a magnesium supplement too.

"As someone who suffered horribly with muscle and joint aches and low mood during the winter, I only wish I'd discovered this supplement sooner.

"Literally within days of taking it I felt much better in general. Less aches and pains, brighter mood. Once you know a bit about what the human body needs and how it works, you can learn to heal yourself."

BetterYou's convenient and user-friendly oral spray delivers vitamin D in a refreshing minty taste. We've tested it and felt it was an effective way of boosting mood during the winter. The bottle lasted all winter and we used two sprays a day. It tastes minty-fresh and provides a little mood boost.

It's an excellent solution for those who struggle to swallow pills, with the bonus of being easily transportable too. It'll fit in a handbag. The spray is easily absorbed into the cheek, and you begin to feel the benefit almost immediately. A customer comments: "Following a vit D deficiency, I started buying this, cheaper on subscription than Holland and Barrett. Does the job and tastes OK. It is good value."

Also, BetterYou has an environmentally conscious approach, using recycled plastic for packaging. Do note that this product contains Cholecalciferol so it may not be suitable for vegan lifestyles.

This supplement is great to take alongside a course of antibiotics or when travelling to keep your body working at its best. Bio-Kult supports both your immune system and the digestive tract. Its unique blend includes vitamin D3 and live yeast. A customer comments: "These tablets must be taken with food. I started by taking two a day; after a week, I could see a difference."

Each supplement contains 6 mcg of D3 and 5 million gut-friendly bacteria, which can help with recovering from illness and digestive issues. Also, we love that it's all-natural with no nasty fillers.
Do note that it is unsuitable for vegans.

You could see all sorts of benefits, including weight loss. As a review comments: "I am now taking one a day, my belly fat has greatly reduced, and people are noticing! I highly recommend these tablets."

If you have difficulty swallowing pills, these Diso Dissolvable Vitamin Strips are a tasty alternative. Our tester was really impressed with the strong raspberry flavour and the instant boost it gave. Natalie found them especially useful as an afternoon pick-me-up while working from home and not getting nearly enough sunshine.

Of all the products we tested, this one is the most creative. The little box of strips came in a package filled with colourful paper shreds. Also, there was a well-designed and informative booklet. You get one month's supply per box. It's convenient to pop the individually wrapped strips in your bag for when you're on the go – it makes a nice sweet treat that's calorie free too. You don't need water, just let it dissolve on your tongue.

Taking vitamin D in this form means it's rapidly absorbed into the bloodstream, so you feel the benefit fast. It's also a precise dose which is more difficult to achieve with drops and spray.

Keep it on your tongue or it will stick to your teeth, but it will dissolve. All-in-all it's a fun and innovative way to get your vitamin D.

If you need the motivation to take vitamins, then these Bioglan Vitamin D3 1000iu Vitagummies are a delicious way to support your vitamin D levels all year round. These vitamin gummies are easy to take – no water and no swallowing difficult tablets. Customers praise them, with one commenting: "These are great. Take these to feel better over the winter months."

Also, customers agree that they taste great. It's like having a sweet that's actually doing you some good. Our tester said that they enjoy the delicious orange taste; it's like having a couple of sweets everyday. Plus, they're good value for money, with 60 gummies in a bottle. It's a tasty way to get sunshine in a bottle that goes some way to supporting bones, muscles and the immune system.

Each fruity serving contains 3000IU (75 µg) of vitamin D3 from Cholecalciferol. They are gelatine-free, too.