Customer Ratings & Reviews

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4.8

Based on 2,872 ratings

2,524

233

What customers say

Customers highly praise Dr. Mercola's Vitamins D3 & K2 supplement for its quality, effectiveness, and reasonable price. Many users report significant health benefits, including improved immune system function, better bone health, and increased vitamin D levels. The product is well-received for its easy-to-swallow capsules and lack of unpleasant side effects. Customers appreciate the combination of vitamins D3 and K2, noting that it supports overall heart health, proper calcium utilization, and respiratory health. The packaging and shipping services from iHerb are also commended for their efficiency. Overall, users trust Dr. Mercola's expertise and recommend this supplement for those looking to boost their vitamin D and K levels.

Review highlights

(2,842)

iHerb customer

Posted on Aug 30, 2021

Cambodia

Vitamins for life!

Verified purchase

As an ophthalmologist and allergic person who, after taking water procedures, cannot help but pour a bunch of cream on herself, vitamin D is not just needed, but vital for well-being, beauty and health support. Vitamin K2 promotes better absorption of vitamin D and calcium, and is also important for vascular health. Now, thanks to including these vitamins, I use hormonal creams only during acute exacerbations. This is not the first time I order and will be back.

Auto-translated from Russian

IrinaS

Silver

Posted on May 13, 2024

Moldova, Republic of

185

127

133

Immune health

Verified purchase

This dietary supplement offers 5,000 IU of Vitamin D3 and 180 mcg of Vitamin K2 (MK-7) per capsule, supporting various aspects of health including immune health. Vitamin D3, regulating over 900 genes, influences functions from cell development to cardiovascular health. However, it's essential to supplement with Vitamin K2 alongside D3 for optimal functionality. Together, they support heart health, bone health, and immune systems. The suggested use is one capsule daily with a meal. With soy-free contents and quality assurance since 2001, this supplement is a reliable choice for overall well-being.

iHerb customer

Posted on Jan 18, 2026

Israel

good!

Verified purchase

I’ve been taking vitamin D supplements regularly, and I’m really pleased with how I feel. It’s helped support my energy levels and overall wellbeing, especially on days with less sun. It’s an easy addition to my routine, and I’d recommend it to anyone looking to fill nutritional gaps and support their immune health!

iHerb customer

Posted on Nov 9, 2025

United Kingdom (UK)

effective and great quality

Verified purchase

I have taken this for years now, and wouldn't be without it. Mercola products contain good quality ingredients, A doctor once told me that with very sparse sun in the UK everyone is deficient in vitamin D, but this dosage has helped get my vitamin D in the optimal range, proven by testing, and my immune system is strong now.. I like that I can buy 90 days supply in the large size, with subscribe and save, which saves a lot of money.

iHerbCustomer

Silver

Posted on Nov 8, 2025

Qatar

235

Verified purchase

I’ve been using Dr. Mercola Calcium with Vitamins D3 & K2 and it ticks all the boxes for me: clean sourcing, strong synergy, and sensible dosage. It uses whole‑food calcium (from eggshell) for absorption, paired with 5,000 IU of vitamin D3 and a MK‑7 vitamin K2 form, which is excellent for directing calcium into bones rather than arteries. If you’re serious about bone density, muscle support, and cardiovascular safety in your supplement stack, this is a standout choice.

iHerb customer

Silver

Posted on Oct 9, 2025

United States

292

210

Great!

Verified purchase

This is a great product with excellent amount of D3 and 180 of my preferred form of K2! I try to make sure I am getting enough A in foods, but it's very difficult to get quality K2 from diet alone unless you are eating natto, which seems to be unavailable in the US,

iHerb customer

Posted on Dec 1, 2024

Kuwait

Best with k2 for NIGHT

Verified purchase

For me, I gradually increased the number of pills and reached 4 pills with fats in the morning, as it gives me energy. I took it once in the evening and couldn’t sleep. So, for me personally, and based on my experience, it’s better in the morning as it provides more energy and clarity. However, if I want to take high doses, the price is currently a bit high for my current budget.

MarieMR

Posted on Jun 24, 2016

501

950

Good Product

Verified purchase

Happy with this product. No nausea, No stomach ache. Hopefully it is doing what it is suppose to do. Good Vit D level and K2 for correct absorption of calcium into bones and keeping those arteries clear Hopefully! iHerb have good customer service and fast packing of goods with a wonderful fast DHL delivery service, Thanks!

iHerbCustomer

Posted on Nov 30, 2025

Poland

The D3 helps with calcium absorption

Verified purchase

I recently started taking this Vitamin D3 and K complex, and I'm very happy with it. Living in a less sunny climate, supplementing D3 is crucial, and the addition of Vitamin K is a game-changer. The D3 helps with calcium absorption, while K ensures that calcium goes exactly where it's needed-straight to the bones-instead of accumulating in arteries. I feel a general lift in energy and overall well-being. The pills are small and easy to swallow.

iHerbCustomer

Posted on Mar 14, 2024

bone, teeth and heart healthy. Boosts immunity, mood, focus and supports memory

Verified purchase

By taking liposomal vitamin D, absorption is increased. The vitamin itself is protected against oxidation and degradation as it moves through the body, making it more bioavailable and more likely to provide optimal benefits

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