The best vitamin D supplement for 2024

Form: Liquid | Dose: 1 ml | IU per serving: 5,000 IU | Additional ingredients: Vitamin K2

Double Wood Supplements D3 + K2 Liquid Drops is our overall winner, thanks to its powerful, well-balanced formulation and exceptional convenience. With a high dose of vitamin D to support bone health, immune function and overall wellness, this supplement goes a step further by including 200 micrograms of vitamin K2 — a critical nutrient for promoting bone growth and proper calcium utilization.

What truly sets this product apart is its simplicity and quality. It contains only three ingredients: vitamin D3, vitamin K2 and medium-chain triglyceride (MCT) oil, which boosts the absorption of these fat-soluble vitamins. This clean formula eliminates unnecessary additives, making it a reliable choice for those seeking transparency in their supplements. Double Wood’s commitment to quality is further reinforced by their third-party testing, with reports readily available on their website for customer review.

The dropper design makes this supplement easy to use, with clear dosage markings for precision. You can dispense it directly into your mouth or mix it into a drink, and the tasteless formula ensures no unpleasant aftertaste. At $0.66 per serving, it’s also an affordable option for a high-quality combination of vitamin D and K2, though slightly pricier than standalone vitamin D supplements.

Users agree on its value and effectiveness. One 5-star Amazon reviewer shares, "Great product and affordable!" They continue, "I switched from another brand of K2/D3. Have been taking this supplement for several months. Have noticed more positive effects, such as decreased brain fog, more energy. I will continue to take this one. I would highly recommend."

However, one important consideration is its inclusion of vitamin K. Yes, it enhances the product's health benefits, but if you're on blood thinners, consult a health care provider before use.

Form: Softgel | Dose: 1 softgel | IU or mcg per serving: 5,000 IU | Additional ingredients: N/A

Now Foods has earned the "best value" title for its unbeatable combination of affordability and effectiveness. Known for offering a broad range of budget-friendly supplements, their high-potency vitamin D delivers 5,000 IU per softgel at just $0.11 per serving — making it one of the most cost-effective options on the market.

This particular supplement has been my personal go-to for years, and I can confidently vouch for its quality and convenience. Each softgel is small, tasteless and easy to swallow, making daily supplementation a breeze. While not third-party tested, Now Foods ensures product safety and quality through rigorous in-house laboratory testing, which adds reassurance without inflating the price.

The 5,000 IU dosage is also a defining quality. It aligns with findings from recent studies that highlight the benefits of this level of vitamin D intake, especially for individuals with low levels. Taking this dose daily may help prevent or speed up recovery from illnesses, improve mood and reduce pain in people with diabetes complications — an impressive list of benefits for such a budget-friendly supplement.

That said, it's worth noting that this product is not vegan-friendly, as the vitamin D is derived from lanolin (sheep wool), and the capsule contains bovine gelatin. Despite these limitations, the combination of potency, ease of use and affordability makes it a standout choice for anyone looking to increase their vitamin D levels without breaking the bank.

Form: Capsule | Dose: 1 capsule weekly | IU or mcg per serving: 75 micrograms calcifediol | Additional ingredients: N/A

Our high-potency pick, Immunotec SunRay, is a true innovator in the vitamin world. It harnesses the power of calcifediol, an advanced form of vitamin D that your body can use immediately, bypassing the processing step required by traditional vitamin D3 (cholecalciferol). Think of calcifediol as the VIP of vitamin D — it skips the line and goes straight to work, delivering faster and more efficient results.

This efficiency means SunRay is easier for your body to absorb and also requires smaller doses to achieve the same benefits as larger amounts of other vitamin D forms. It's the right choice for anyone seeking maximum potency with minimal effort.

Immunotec takes this science and pairs it with next-level convenience. Designed to be taken once a week rather than daily, it's an ideal supplement for anyone who wants to streamline their routine without sacrificing potency. A single, easy-to-swallow capsule packs all the power you need for the week, making it a standout choice for busy people or anyone who just prefers simplicity. However, if you're like me, it may be easier to forget because you don't have to take it daily!

One happy Amazon reviewer captures its appeal perfectly — "Convenience and effectiveness!" They continue, "SunRay fits perfectly into my lifestyle. One pill a week is all it takes, and I've seen better results than with daily supplements. Staying consistent with supplements has always been a challenge for me, but SunRay's weekly capsule has been a game-changer. It's the perfect solution for anyone who struggles with consistency like I do. Highly recommend!"

However, the supplement is on the pricier side at $30 for a month's supply. Furthermore, Immunotec's website doesn't state if this product is third-party tested. That said, the company carefully sources its ingredients and is heavily involved in dietary supplement research, so this is appears to be a high-quality product.

Form: Capsule | Dose: 1 capsule | IU per serving: 2,000 IU | Additional ingredients: Vitamin C, vitamin K1, vitamin K2, organic mushrooms, organic greens and organic sprouts

Pure Synergy Vitamin D3 + K2 Complex is a top organic option in a market flooded with synthetic and heavily-processed ingredients. With its focus on organic, whole-food sources that are USDA-certified, this supplement delivers clean, natural nutrients that appeal to health-conscious consumers seeking products free from synthetic pesticides like glyphosate, which are linked to environmental and health concerns.

As one long-time Amazon user notes, "Have been using products from pure synergy for 20-plus years. They are still the best. Naturally sourced perfectly complementary and good value."

Pure Synergy pairs vitamin D3 and K2 to strengthen bones and support calcium absorption, ensuring these nutrients work together synergistically for maximum benefit. The inclusion of MCT oil enhances the absorption of these fat-soluble vitamins, making it a smart and efficient option for those looking to optimize their supplementation.

Pure Synergy products undergo rigorous testing, including both in-house and third-party lab assessments, to ensure safety and potency. This dual-layer approach gives you peace of mind about what you're putting into your body. I've been consistently impressed with the quality and reliability of their supplements, which are both effective and easy to take.

While this supplement excels in its organic formulation, it offers a lower vitamin D dosage of 2,000 IU per serving compared to other high-potency options, which can go up to 5,000 IU. If you have low vitamin D levels, consult a health care provider to determine if this dosage meets your needs.

Form: Capsule | Dose: 1 capsule | IU per serving: 5,000 IU | Additional ingredients: Vitamin K2, calcium, black pepper extract

Did you know your bones are constantly rebuilding themselves? Every 10 years or so, your skeleton is essentially brand new. But for this remarkable process to work smoothly, your body needs the right nutrients in the right amounts — especially vitamin D, vitamin K2 and calcium. That’s where our top choice for bone health, High Level Vitamin D3 + K2, steps in, offering a powerhouse combination to keep your bones strong and resilient.

Vitamin D and vitamin K2 work synergistically to support bone health. Vitamin D enhances calcium absorption, making sure your body can take in this essential mineral from your diet. Meanwhile, vitamin K2 ensures the absorbed calcium goes to your bones rather than building up in arteries or soft tissues where it could cause harm.

What makes this supplement stand out is its inclusion of calcium, providing your body with an immediate supply of this crucial mineral needed for bone density and strength. Since many people don't get enough calcium through their diets, this added ingredient bridges the gap and makes the formula even more effective at supporting overall bone health.

As one 5-star Amazon reviewer writes, "I absolutely love K2 + D3 from High Level.... my favorite things about it are that it helps with my circulation issues and boosts my immune system among other things!!! Yet another win in my book for High Level!!!"

High Level has also included BioPerine, a black-pepper extract that enhances bioavailability. This clever addition ensures your body absorbs and uses the active ingredients. However, timing matters — taking this supplement with or shortly before a meal containing fat is key since vitamins D and K are fat-soluble and need dietary fat to be properly absorbed.

Practicality and quality are also strong points here. The supplement is third-party tested for safety and potency, giving you confidence in its purity. The capsules are easy to swallow, with no aftertaste or side effects noted. And for those with specific needs, the option to take it up to twice daily provides flexibility, though you should check with your doctor if you're on blood thinners, as vitamin K can interfere with such medications.

Form: Gummy | Dose: 2 gummies | IU per serving: 2,000 IU | Additional ingredients: N/A

Who says supplements can't be fun? Our favorite gummy option, NatureMade Vitamin D Gummies, redefines how you take vitamins with a sweet, chewable alternative to traditional pills, perfect for anyone who dislikes swallowing tablets or capsules. They're also thoughtfully crafted to suit various dietary needs, being sugar-free and sweetened with maltitol, which has minimal impact on blood sugar levels — an excellent choice for those managing insulin resistance or diabetes.

What truly sets these gummies apart is their balance of flavor and texture. With a strong fruity taste and pleasant chew, they're enjoyable without being overly sweet. One reviewer highlights, "I dislike taking pills, and I wasn't taking my vitamins until I switched to gummies. This vitamin D tastes like a candy, and zero sugar! Now I take it as a treat with a benefit." When a supplement is enjoyable, it makes sticking to a routine far easier — often the hardest part of taking vitamins. That said, I think I'd prefer another fruit flavor over cherry — which is very strong.

The gummies contain 2,000 IU of vitamin D per serving, which is sufficient for many, though not as high as some 5,000 IU options designed for rapid replenishment. Additionally, they're made with palm oil, a source of fat that aids in the absorption of fat-soluble vitamin D, so you don't have to take them with a meal.

NatureMade products are verified by United States Pharmacopeia (USP), a trusted third-party organization that rigorously tests supplements for purity and potency. This certification ensures you're getting exactly what the label promises, offering peace of mind alongside a tasty supplement.

Form: Capsule | Dose: 1 capsule | IU or mcg per serving: 5,000 IU | Additional ingredients: N/A

Momentous Vitamin D is our leading choice for athletes because of its exceptional certification pedigree. It's both NSF Certified for Sport and Informed-Sport certified, ensuring it's been rigorously third-party tested for quality and safety. These certifications guarantee the supplement is free from substances banned in athletic competitions, meaning sportspeople can have confidence in their supplementation routine.

For athletes and highly active individuals, vitamin D is more than a supplement — it's a performance booster that can help support muscle growth, reduce inflammation and promote faster recovery after intense workouts.

With 5,000 IU of vitamin D per serving, Momentous Vitamin D provides a research-backed dose that may help enhance athletic performance metrics like sprint times, vertical jump, maximal running capacity and oxygen uptake. Maintaining optimal vitamin D levels can directly impact physical performance, making this supplement a valuable tool for athletes aiming to optimize performance.

The capsules themselves are small and easy to swallow, making them convenient for daily use. However, since they don't contain added fat, they should be taken with a meal to maximize absorption of this fat-soluble vitamin.

Form: Capsule | Dose: 1 capsule | IU or mcg per serving: 5,000 IU | Additional ingredients: Vitamin K2

Did you know that without vitamin K2, a form of vitamin K, calcium could end up in all the wrong places? This critical nutrient supports bones and also prevents calcium from building up in your arteries, which can lead to serious cardiovascular issues. While vitamin D ensures your body absorbs calcium efficiently, vitamin K2 directs it to your bones.

For many, getting enough K2 can be a challenge. This vital nutrient is primarily found in animal-based foods and fermented products like natto, which are uncommon in most diets. That's where our top capsule for K2 — Life Time Fitness Vitamin D + K2 — comes in, pairing 5,000 IU of vitamin D with 200 micrograms of vitamin K2 to create a two-pronged approach to strengthen your skeleton and protect your cardiovascular system. While some of the other products on this list contain K2, this is the only one (other than our best overall pick, which is a liquid vitamin, not a capsule) that contains 200 mcg. 

The supplement is third-party tested by NSF, with detailed testing reports available on their website, giving you confidence in your purchase. Plus, the small, easy-to-swallow capsules are convenient for daily use. However, because they don’t contain added fat, you should take them with a meal that includes dietary fat to enhance absorption.

A word of caution: if you’re on blood-thinning medications, you should consult your doctor before taking this supplement, as vitamin K2 can affect how these medications work.