Best Vitamin D3 + K2 on iHerb (2026): Top Picks, Dosage, and How to Choose

Vitamin D3 supports calcium absorption and bone health, while Vitamin K2 helps guide calcium to the right places in the body (like bones). That’s why many people prefer a D3 + K2 combo instead of taking D3 alone.

This guide compares the best Vitamin D3 + K2 supplements available on iHerb, with a clear table, selection criteria, and a simple dosing guide.

Medical note: This article is educational and not medical advice. If you take anticoagulants (e.g., warfarin) or have kidney problems/high calcium, speak with a clinician first. Vitamin K can interact with warfarin and requires consistent intake. Office of Dietary Supplements
Vitamin D has tolerable upper intake limits depending on age (many adults: 4,000 IU/day UL). Office of Dietary Supplements

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Quick answer: what to buy first

If you want one “safe, popular” starting choice for most adults, pick a D3 5,000 IU + K2 MK-7 100–120 mcg softgel (easy once daily).

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How we chose (simple criteria)

We prioritized:

• Clear dosage (D3 IU + K2 form and amount)
• K2 form = MK-7 (the most common form in combo products)
• Convenient serving size (1 softgel/capsule is ideal)
• Good ingredient profile (minimal fillers, reputable brand)

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Comparison table (fill from labels)

Product	Form	Vitamin D3 per serving	Vitamin K2 per serving	Servings	Best for
Sports Research Vitamin D3 + K2	Softgels	5,000 IU (125 mcg)	100 mcg (MK-7)	60	Best overall balance
California Gold Nutrition Vitamin D3 + K2	Softgels	5,000 IU	120 mcg (MK-7)	90	Best value / longer bottle
NATURELO Vegan D3 + K2	Capsules	5,000 IU	100 mcg (MK-7)	60	Best vegan option
Thorne Vitamin D + K2 (liquid)	Liquid drops	(see label)	(see label)	varies	Best for people who prefer drops

Label references (from iHerb pages):

• Sports Research lists Vitamin D (D3) 125 mcg (5,000 IU) and Vitamin K2 100 mcg (MK-7). iHerb
• California Gold Nutrition lists Vitamin D3 125 mcg (5,000 IU) and Vitamin K2 (MK-7) 120 mcg. iHerb
• NATURELO Vegan D3 + K2 lists Vitamin D3 125 mcg (5,000 IU) and Vitamin K2 (MK-7) 100 mcg. iHerb
• Thorne D+K2 product page shows it’s a D+K2 liquid format on iHerb (use the label section for exact drop dosage).

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Best Vitamin D3 + K2 on iHerb (Top picks)

Why we like it: clean and simple formula, easy once-daily softgel, and a very common “sweet spot” dosage.
Label highlights: D3 5,000 IU + K2 MK-7 100 mcg. iHerb
Best for: most adults who want a straightforward combo for bone + overall support.
Not ideal for: anyone told by a clinician to avoid high-dose D3.

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Why we like it: typically positioned as a value pick, and often comes in larger count.
Label highlights: D3 5,000 IU + K2 MK-7 120 mcg. iHerb
Best for: people who want a strong dosage and good value per serving.

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Why we like it: vegan-friendly D3 option (commonly from lichen) paired with MK-7.
Label highlights: D3 5,000 IU + K2 MK-7 100 mcg. iHerb
Best for: vegan/vegetarian readers who still want a “high potency” D3 + K2.

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Why we like it: liquid can be easier for people who dislike capsules, and allows flexible dosing.
Use this if: you need custom dosing (e.g., smaller or split doses).
Tip: Put the exact IU per drop and mcg per drop from the label into your table to keep the article accurate.

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How to choose the right D3 + K2 dosage (simple guide)

Step 1: Choose a D3 level that matches your goal

• Maintenance / general support: often 1,000–2,000 IU/day
• Higher-potency products: common are 5,000 IU (more “therapeutic-style”)

The NIH fact sheet notes upper intake limits vary by age, and many adults have a UL of 4,000 IU/day. Office of Dietary Supplements
So if you pick a 5,000 IU product, many people use it less frequently (e.g., 4–6 days/week) depending on clinician guidance and bloodwork.

Step 2: Prefer K2 as MK-7

Most combo products use MK-7, usually 90–200 mcg. That range is common for daily use in supplements.

Step 3: Check medication interactions

If you take warfarin (Coumadin) or other vitamin-K–sensitive anticoagulants, don’t start K2 without medical guidance. NIH notes vitamin K can reduce warfarin effectiveness and intake should be consistent. Office of Dietary Supplements

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When to take Vitamin D3 + K2

• With a meal that contains fat (better absorption for fat-soluble vitamins)
• Many people prefer morning or lunch
• If it upsets your stomach: take with a larger meal

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Who should NOT take D3 + K2 without medical advice

• People on warfarin or related anticoagulants Office of Dietary Supplements
• People with high blood calcium, kidney stones, kidney disease
• Anyone already taking high-dose D3 and calcium together (excess D can raise calcium). Office of Dietary Supplements

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