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Strong Bones & Teeth
Vitamin D helps your body absorb and use calcium and phosphorus, maintains normal blood calcium levels, and supports healthy bones and teeth. It plays a vital role in keeping your skeletal system strong and resilient throughout life.

Reduced Risk of Falling in Old Age
Vitamin D contributes to normal muscle function. It also helps reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures among men and women 60 years of age and older — sometimes caused by low vitamin D levels leading to weakened thigh muscles. Regular intake of vitamin D helps support muscle strength and coordination.

Immunity at Every Age
The normal function of the immune system is supported by vitamin D in adults and children alike. Adequate vitamin D levels help your body’s defences stay strong all year round.

Cellular Support
Vitamin D plays a role in the process of cell division, supporting your body at a fundamental level. It helps maintain normal tissue renewal and overall cellular health.

From animal sources

Nutritional Information
Serving Size: 1 Softgel
Servings Per Container: 425
Ingredients
Amount Per Serving
*NRV
Vitamin D3 Cholecalciferol
4000 IU
2000%

*NRV = Nutrient Reference Value
Ingredients: Sunflower Oil, Capsule Shell (Gelatine [Bovine], Glycerine), Vitamin D3 (Cholecalciferol) 4000IU.

Clean with no additives, Free from gluten, dairy and other common allergens

Storage
Keep out of direct sunlight in a cool, dry place. Keep out of reach of children. For best before end and batch number see base.

Cautions
Food supplements must not be used as a substitute for a varied diet and healthy lifestyle. If you are pregnant, lactating, taking medication, under medical supervision or under the age of 18 it is advisable to consult a GP prior to taking any supplements. Discontinue use and consult a GP if any adverse reactions occur. Do not exceed stated dose.

Take 1 softgel daily with food.

4.9
Rated 4.9 out of 5 stars
4.9 Stars (420 Reviews)

Vitamin D3 Tablets

425 Softgels ~ 14 Month Supply
  • Stronger bones & teeth
  • Fighting fit immune system
  • Reduce risk of falls & bone breaks
  • 4000 IU Vitamin D per serving
60 Day Money Back Guarantee

Strong Bones & Teeth
Vitamin D helps your body absorb and use calcium and phosphorus, maintains normal blood calcium levels, and supports healthy bones and teeth. It plays a vital role in keeping your skeletal system strong and resilient throughout life.

Reduced Risk of Falling in Old Age
Vitamin D contributes to normal muscle function. It also helps reduce the risk of falling associated with postural instability and muscle weakness. Falling is a risk factor for bone fractures among men and women 60 years of age and older — sometimes caused by low vitamin D levels leading to weakened thigh muscles. Regular intake of vitamin D helps support muscle strength and coordination.

Immunity at Every Age
The normal function of the immune system is supported by vitamin D in adults and children alike. Adequate vitamin D levels help your body’s defences stay strong all year round.

Cellular Support
Vitamin D plays a role in the process of cell division, supporting your body at a fundamental level. It helps maintain normal tissue renewal and overall cellular health.

From animal sources

Nutritional Information
Serving Size: 1 Softgel
Servings Per Container: 425
Ingredients
Amount Per Serving
*NRV
Vitamin D3 Cholecalciferol
4000 IU
2000%

*NRV = Nutrient Reference Value
Ingredients: Sunflower Oil, Capsule Shell (Gelatine [Bovine], Glycerine), Vitamin D3 (Cholecalciferol) 4000IU.

Clean with no additives, Free from gluten, dairy and other common allergens

Storage
Keep out of direct sunlight in a cool, dry place. Keep out of reach of children. For best before end and batch number see base.

Cautions
Food supplements must not be used as a substitute for a varied diet and healthy lifestyle. If you are pregnant, lactating, taking medication, under medical supervision or under the age of 18 it is advisable to consult a GP prior to taking any supplements. Discontinue use and consult a GP if any adverse reactions occur. Do not exceed stated dose.

Take 1 softgel daily with food.

Dietary Suitability and Allergens

Quality Assured Supports Normal Immune System Function No Artificial Colours or Flavours No Synthetic Binders or Fillers Gluten Free Lactose Free Good Manufacturing Practice

What is Vitamin D Good For?

Strong Bones & Teeth

Vitamin D helps your body absorb calcium and phosphorus — the building blocks of strong bones and teeth. By keeping calcium levels balanced, it supports bone density and everyday strength from childhood through later life.

Muscle Strength & Stability

Low vitamin D can lead to weaker muscles, especially in the thighs, increasing the risk of falls in older adults. Taking vitamin D daily helps support muscle strength, balance and coordination, keeping you steady, active and confident on your feet.

Immune Support for All Ages

Vitamin D is vital for a strong, responsive immune system in both adults and children. It helps your body’s natural defences work efficiently, offering year-round support against colds, flu and other bugs.

Cellular Health & Renewal

Vitamin D supports cell division and renewal, essential for everything from wound healing, internal organ renewal and skin repair to hair growth and maintaining your whole body. 

Vitamin D tablets help maintain healthy bones, muscles and immunity by supporting calcium absorption, and by regulating calcium and phosphate balance in the body. Supplementing with vitamin D is especially important during autumn and winter, or for anyone who gets little sun exposure, as the body produces vitamin D naturally from sunlight.

Not exactly. “Vitamin D” refers to a group of related compounds, but vitamin D3 (cholecalciferol) is the most effective and biologically active form. It’s the same type your body produces when skin is exposed to sunlight and is generally better absorbed and utilised than D2 (ergocalciferol), which comes from plant sources.

Yes, daily supplementation is safe and effective for most people when taken at the recommended dose. Regular intake helps maintain steady blood levels of vitamin D, which supports bones, immunity and muscle function. Because the body stores vitamin D, consistency matters more than large occasional doses.

Vitamin D supports calcium absorption, keeping bones and teeth strong. It helps muscles function properly and contributes to balance and coordination. It also plays a crucial role in immune defence and supports cell growth and repair, making it essential for overall health at every age.

Low vitamin D levels can cause tiredness, low mood, muscle weakness, bone discomfort or more frequent infections. People often describe feeling run-down, sluggish or achy without realising their symptoms may be linked to deficiency. It can also cause skin itching and irritation, particularly at night. A simple blood test can confirm low vitamin D and guide appropriate supplementation.

Vitamin D is fat-soluble, so take it with a meal that contains some healthy fat for best absorption. Many people prefer taking it in the morning or at lunchtime as part of their daily routine. Some find it slightly energising, so taking it earlier in the day can help avoid any interference with sleep.

The richest natural sources of vitamin D are oily fish such as salmon, mackerel and sardines. Other sources include eggs, fortified cereals, plant milks and margarine. However, it’s difficult to get enough from food alone, which is why supplements are often recommended, especially in winter or for people who avoid animal products.

The best form of vitamin D for supplements is vitamin D3 (cholecalciferol), as it’s the same type your body naturally makes from sunlight and is more efficiently absorbed than vitamin D2 (ergocalciferol). Look for a product that provides 4,000 IU (100 µg) per day for strong support. For even better absorption, vitamin D3 is often paired with a small amount of healthy fat or oil (such as sunflower oil or flaxseed oil), since it’s fat-soluble. VitaBright vitamin D meets all these criteria, is made to exacting GMP standards, tested for purity, and provides a bioavailable form your body can use efficiently - ideal for supporting bones, muscles, immunity and wound healing.

VitaBright supplements are produced in state-of-the-art, BRCGS certified grade AA manufacturing facilities in the UK. We manufacture to GMP standards - the same as pharmaceutical medicines - which means our process involves batch testing, rigorous record-keeping, and spot-check official inspections. We use only the finest ingredients sourced from leading global suppliers, double seal all bottles, and have ingredients independently tested for heavy metals to further guarantee our supplement quality and safety.

What Customers Say About VitaBright Vitamin D3

Great Quality

"Since I first started taking Vitamin K2 MK-7, I haven’t stopped - on replenishment nonstop! It is amazing. I ended up having all my vitamins and supplements from Vitabright. Now, my dad and my partner use Vitabright as well. Great quality for good value. And I definitely feel the difference!"

Joyce S

It does work

"I knew my 25 OHD level before I started taking this Vit D. It was already high. I stopped taking my "old" Vit D and after switching to Vitabright Vit D and taking it for a month I checked my 25 OHD level again. It stayed at the same level so It does work."

Kevlys

Wonderful products

"Your product are always brilliant. Thank you"

Silvia B

Healthy choice

"I work indoors, so a Vitamin D supplement is highly important. It was also recommended by my doctor as a way to alleviate fatigue. These are a higher concentration than most on the market, and I chose this level following a recommendation by Dr Anthony Fauci. Definitely worthwhile."

Adrian W

Definitely works

"Vitamin D3 definitely works. My blood results have gone up. I do find it strange though that your k2 comes in such small bottles in comparison to the vitamin D.

I am in less pain now my vitamin D has gone up and my blood results show its the real deal"

Lucy P

4.9
Rated 4.9 out of 5 stars
Based on 420 reviews
99%would recommend these products
Slide 1 selected
Reviews Summary
Customers say these vitamin supplements are easy to swallow and provide good value with generous quantities lasting 14 months. Many users take them together, particularly pairing vitamin D3 with K2. Common feedback includes improved energy levels, better mood, and enhanced joint comfort. Customers appreciate the high-strength formulation and find the capsules convenient to take daily. Many mention taking them during winter months or as recommended by healthcare providers. Several long-term users report positive experiences and continue reordering. Some note the products work well for maintaining overall wellbeing.
420 reviews
  • JS
    Joyce S.
    Verified Buyer
    Reviewing
    Vitamin K2 MK-7
    I recommend this product
    Product Standouts Easy to Swallow, Great Quality, I Feel the Difference
    Would you recommend this product to a friend? Already have
    Rated 5 out of 5 stars
    1 year ago
    Great Quality

    Since I first started taking Vitamin K2 MK-7, I haven’t stopped - on replenishment nonstop! It is amazing. I ended up having all my vitamins and supplements from Vitabright. Now, my dad and my partner use Vitabright as well.

    Great quality for good value. And I definitely feel the difference!

    V Profile picture for VitaBright
    VitaBright
    1 year ago

    Hello Joyce, thank you for your wonderful 5-star review and feedback about our Vitamin K2 MK-7. We're absolutely delighted to hear that you've been replenishing nonstop since you first started taking it - that's the ultimate testament to a product's effectiveness! It's fantastic to know that our Vitamin K2 has impressed you so much that you've switched all your vitamins and supplements to VitaBright, and we're thrilled that your dad and partner have joined the VitaBright family too. Your experience perfectly reflects our commitment to providing great quality supplements at good value that deliver real, noticeable benefits. We're so pleased that you can definitely feel the difference our products are making to your wellness journey. Regards, VitaBright.

  • ID
    Ian D.
    Verified Buyer
    Reviewing
    Vitamin D3 Tablets
    I recommend this product
    How old are you? Over 75
    Product Standouts Value for Money
    Would you recommend this product to a friend? Already have
    Rated 5 out of 5 stars
    1 year ago
    Who knows

    Could'nt really point to any particular benefit but at the age of 77 I am reasonably fit and healthy, eat a healthy diet and exercise every day. so not all down to D3 but probably helps.

    V Profile picture for VitaBright
    VitaBright
    1 year ago

    Hello Ian, thank you for your 5-star review and feedback about our Vitamin D3. We're delighted to hear your balanced and thoughtful assessment of your supplementation experience. Your pragmatic approach to overall wellness, combining healthy eating, regular exercise, and targeted supplementation, validates our commitment to providing premium vitamin solutions that complement an active, health-conscious lifestyle. The carefully sourced Vitamin D3 in our formula is specifically chosen to support optimal health maintenance, particularly important for maintaining wellbeing as we age. Your practical perspective about the role of supplementation as part of a comprehensive approach to health aligns perfectly with our mission to deliver superior supplements that provide supportive benefits as part of a well-rounded wellness routine. Regards, VitaBright.

  • ES
    Ewa S.
    Verified Buyer
    Reviewing
    Vitamin D3 Tablets
    I recommend this product
    How old are you? 35-44
    Product Standouts I Feel the Difference
    Would you recommend this product to a friend? Already have
    Rated 5 out of 5 stars
    1 year ago
    Great product!

    Since I started taking vitamin D regularly, my energy levels have increased significantly, and my mood has improved a lot. I highly recommend this product!

    V Profile picture for VitaBright
    VitaBright
    1 year ago

    Hello Ewa, thank you for your 5-star review and positive feedback. We're delighted to hear that our Vitamin D3 4000 IU has proven effective in boosting your energy levels and improving your mood. Your experience with these significant improvements showcases the meaningful benefits of regular vitamin D supplementation. Your positive results affirm our commitment to providing premium solutions that deliver tangible results, ensuring our products stand out from the rest. We're thrilled that our Vitamin D3 has become a trusted choice in supporting your overall well-being. We look forward to our product continuing to exceed your expectations and contribute to your satisfaction as you consistently incorporate it into your daily routine. Regards, VitaBright.

  • M
    Mrs
    Reviewing
    Vitamin D3 and K2 Combo
    I recommend this product
    Rated 5 out of 5 stars
    4 weeks ago
    5 Stars

    Good Afternoon,

    I received my order and on opening it, my order came incomplete.

    I ordered 2 bottles of High Strength Omega 3 however, only one bottle was sent.

    UPDATE: The missing Omega 3 has been delivered today. My complaint was swiftly attended to. Thank you, Vitabright. What a good customer relationship!

  • OA
    Oluwayomi A.
    Reviewing
    Vitamin D3 and K2 Combo
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    SMALL SIZE FIBROID SHRUNK

    I was told I had a 2 small size of fibroid. I researched online to see what could help. I stumbled on the combination of VIT D3, MK2-K7 and Magnessium positive review. In choosing the brand to try, I chose Vitabright. Several months later, the fibroid shrunk and totally disappeared. This is my experience, and it is not meant to treat fibroid.

    V Profile picture for VitaBright
    VitaBright
    1 month ago

    Hi Oluwayomi, thank you so much for taking the time to leave a review and for sharing your personal experience with our Vitamin D3 and K2 Combo.

    We really appreciate you letting us know about your journey and how combining these nutrients has worked for you. It's wonderful to hear that you found a solution that resonated with your research, and we're glad you chose VitaBright to support you along the way.

    Thank you for your continued support.

    Regards,
    VitaBright

Customer Questions

  • SP
    If it's recommended that D3 is taken with K2, why does this product not have K2 in it, like many other Vitamin D supplements? Considering growing research shows that taking D3 without K2 to direct that calcium, it can build up in soft tissues like arteries, potentially causing calcification and increasing cardiovascular risk. I'm not sure how you can promote 'stronger bones and teeth' when without K2, it could go to the wrong places (like arteries) instead of your bones and teeth. If it's crucial to have both for best absorption, why would you sell D3 without K2? I feel you should clearly state on the label 'to be taken alongside K2' to cover this for people who don't know, as I've been taking your product for nearly a year and have only just found this out! I feel I've been mis-sold this product for my bone health, and have been potentially damaging my body unknowingly. The mention of taking K2 isn't anywhere on the D3 page, not until you come to the 'questions' section.
    VitaBright

    Thank you so much for taking the time to share your concerns. We're glad you reached out so we can clarify how our product is formulated and how it fits within current guidance.
    Vitamin D3 and Vitamin K2 can be taken together, but they are not universally required to be combined. While some brands choose to include both in a single capsule, it isn’t a regulatory or clinical requirement. Current UK and EU guidance does not state that D3 must be taken with K2, and Vitamin D supplements without K2 are widely used and considered safe.
    Our D3 is formulated as a standalone supplement because many people already obtain Vitamin K through their diet or prefer to manage their intake separately. Combining nutrients in one capsule can be helpful for some, but it can also limit flexibility for those who need different strengths, are already taking K2 from another source, or have been advised to tailor their intake differently.
    Regarding the concern about calcium “going to the wrong places,” it’s important to note that this is an area of ongoing scientific interest, and current regulatory bodies, including the European Food Safety Authority and the UK Department of Health, have not issued guidance stating that D3 should only be taken alongside K2. If such a requirement existed, we would of course follow it.
    That said, we absolutely understand that some customers prefer to take D3 and K2 together, and we’re always reviewing emerging research and customer feedback when considering future formulations.
    Your point about clearer labelling is genuinely appreciated. We never want anyone to feel unsure about how to use our products, and your feedback will be passed to our product and compliance teams so we can look at how to make this even clearer for customers.
    If you’d like to take D3 and K2 together going forward, you’re very welcome to pair our D3 with a separate K2 supplement. Many customers prefer this approach because it allows them to choose the exact strength and form that suits them best.

  • Geoff
    I am a 75 year old man reasonably fit - currently I take two of these tablets daily - am I overdosing?
    VitaBright

    As stated on the bottle, this supplement one capsule a day. You should not be taking more than the stated dose.

  • Brian
    Why is the first ingredient listed as sunflower oil in the vitamin D3 supplement? Does that mean it has more of sunflower oil than the other important ingredients? Seed oil isn't the healthiest. Why isn't extra virgin Olive oil used instead? Thanks
    VitaBright

    Hello. Sunflower Oil does make up the majority of the capsule fill, as it is a carrier for the active ingredient. Sunflower seed oil is used due to its natural antioxidant properties, its neutral taste and because it is high in other vitamins. particularly vitamin E and Omega 6.

  • Jenny
    This supplement has 2000% daily requirements. Is this safe? Why is it so high?
    VitaBright

    Our Vitamin D3 is formulated to treat low levels of vitamin D, not to maintain the minimum amount required by the 'average healthy adult' (otherwise known as RDA/NRV). In the UK it’s been found that 60% of us have less than the ideal amount of vitamin D and 20% have an actual deficiency.

    In the UK we all suffer from a lack of sunlight in winter, which is why the government recommends that everyone should take a vitamin D supplement. If you work indoors all day, this may also apply to you during the summer. The more tanned or naturally dark your skin, the less vitamin D you will make in sunlight and the higher your risk of a deficiency. Using sunscreen creams will also stop you from making vitamin D when out of doors.

    4000iu is the lowest upper level the average adult can safely take on a daily basis. We also recommend it be taken alongside vitamin K2, to ensure the calcium it creates is directed to your bones and teeth.

  • Lesley B.
    Is your vitamin D3 come from lanolin from sheepd wool or vegan products?
    VitaBright

    The D3 is sourced from lanolin, and the capsule shell is gelatine. As stated under the Safety section of the product page, this product is not suitable for vegans or vegetarians.

  • Y
    Do I take K2 at same time of day with It D3 ?
    VitaBright

    Yes, D3 and K2 are better taken together.

  • Judy
    My 13 year old daughter has been advised to take a vitamin D supplement. Is this product suitable for a 13 year old?
    VitaBright

    Hello, Yes, this is suitable to be taken by those 12 and over, however we recommend also taking Vitamin K2 with any high-strength D3, to ensure correct absorption. Regards, VitaBright.

  • Amelia C.
    Is your Vitamin K2 a trans isomer or a cis isomer?
    VitaBright

    Our Vitamin K2 consists of 100% trans isomer.

  • Angel I.
    Is your Vitamin K2 fermented from soya beans or soy protien?
    VitaBright

    It's fermented from soya beans.

  • Anthony Q.
    Where are the ingredients for your Vitamin K2 sourced from?
    VitaBright

    Our raw ingredients are sourced from the best herbs, botanicals and other natural produce across the world. However, they are all then lab tested in the UK and manufactured into supplements in the UK. The raw ingredients in our Vitamin K2 are currently sourced from both Europe and Asia.

  • Arianna W.
    Which bacteria strain is used in the fermenting process?
    VitaBright

    Our vitamin K2 is fermented using bacillus subtilis.

  • Audrey T.
    Your Vitamin K2 is made from soya, so how is it allergen free?
    VitaBright

    Our Vitamin K2 is extracted from Natto, a form of fermented soya, but all traces of soya is 100% removed during the extraction process. Therefore we can guarantee that the supplement is completely soya-free and safe to take if you are allergic or intolerant. We use natto because it yields a particularly high quality form of Vitamin K2.

  • Austin B.
    Is your Vitamin K2 derived from chickpeas or soya?
    VitaBright

    Our Vitamin K2 is derived from soy beans.

  • Jayden N.
    What is the source of your vitamin D3?
    VitaBright

    Our Vitamin D3 is sourced from lanolin from sheep wool.

  • Jeremiah T.
    How long does Vitamin D take to get into your blood?
    VitaBright

    Vitamin D will get into your blood within hours but it can take 1-3 months for vitamin D levels in your blood to build up and remain steady depending on how deficient you are. This depends on a number of factors. Our Vitamin D is the best absorbed form of Vitamin D. We recommend taking Vitamin D with your main meal of the day for best absorption.

  • Jonathan D.
    How many IU's are in your Vitamin D3 per microgramme?
    VitaBright

    One softgel contains 100 mcg (microgrammes) of Vitamin D3, which equals 4000 IU (international units).

  • Joseph F.
    Where is the Vitamin D3 from in your supplement?
    VitaBright

    We source our Vitamin D3 oil from Germany, as it's the best quality we could find. Like all our products, the softgels are then manufactured and prepared in the UK.

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