- Bioavailable Vitamin D3: Our Vitamin D3 supplement is delivered in a base of organic flaxseed oil for optimal absorption due to the fat-solubility of vitamin D
- Bone Health Support: This supplement is essential for supporting healthy bones
- Aids Strong Bones & Joints: To support bone and joint health, take 1 softgel per day or as directed by a health professional
- Daily Immune Health Supplement: This vitamin D3 supplement is free from dairy, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, salt, tree nuts, and GMOs
- Quality You Can Trust: Family-owned for over 60 years, Natural Factors is committed to creating high-quality supplements backed by rigorous testing; Every batch is third-party tested by ISURA for 800+ contaminants, including pesticides, solvents, and heavy metals

C. Demetro –
Does exactly what it’s supposed to; and no unnecessary additives
The title says it all – keeps my D levels where they’re supposed to be on the blood work; and it’s got no glutens, sugars, yeast derivatives (for stabilizers, I think), or soy products – all of which are no-no’s for me due to dietary concerns related to Lyme disease. Usually it’s at a good price, too. Also, it’s a very consistent product – I don’t have to check the back of the label every time I buy from this company just to make sure the formulation hasn’t changed from month-to-month.
Millie S –
Very Satisfied
I have ordered this product several times. it is a healthy choice and is always delivered on time.
Doreen T. Matthews –
Don’t know how to rate.
I don’t feel any different.
Tennes M. Rosengren –
Easy to swallow
I have been using the Natural Factors, D3 1000 tab for the past 5 or 6 years. They seem to work just fine. The only real way to know is if you get a blood test. I like the size of the tab and they come in 1000 units. I only have one rub. I was asked to rate this product before it even arrived at my house. Overall I will continue to use the Natural Factors, D3 1000 tab.
Amazon Customer –
Always arrived on time in excellent condition!
I use these as a part of my daily supplement routine.. they have always arrived promptly and in excellent condition,
Rita Kroon –
D3 is for Me!
Theses Vitamin D3 tablets are easy to swallow, and you can be confident these tablets give you the right measure of D3 without a lot of additives!
Erick Schmidt –
Great Supplement
Great supplement! I have been taking this D3 vitamin for about three years and it a wonderful nutrient for my anatomy.
Debra Reynolds –
Natural Factors, Vitamin D3 1000 IU (25 mcg)
Arrived on time and in perfect condition!