Vitamin D3 5,000 IU: How to Read the Numbers on Your Label

5,000 IU. 125 mcg. 625% DV. Three numbers on one line, and they all describe the same amount of vitamin D3.

If that line confuses you, you're not alone. Here's how to read it, and how it lines up with the official intake guidelines.

The quick answer

• IU and mcg are two units for the same thing. 1 mcg of vitamin D = 40 IU, so 5,000 IU = 125 mcg [1].
• 5,000 IU is a high daily amount. The adult RDA is 600 IU (800 IU after 70), and the Upper Limit for adults is 4,000 IU a day [1]. Talk with your health care practitioner before using a product at this level.
• Take it with a meal that has some fat. Vitamins A, D and K are fat-soluble [1][3].

See ADK Evail (Vitamins A, D & K) →

IU vs. mcg: the unit math

Labels used to list vitamin D only in International Units (IU). Newer labels list micrograms (mcg) first, often with IU in parentheses. The conversion is fixed: 1 mcg equals 40 IU [1].

| IU | mcg | |---|---| | 600 IU | 15 mcg | | 800 IU | 20 mcg | | 4,000 IU | 100 mcg | | 5,000 IU | 125 mcg |

How 5,000 IU compares to the RDA and the Upper Limit

The Food and Nutrition Board sets a Recommended Dietary Allowance (RDA) of 600 IU (15 mcg) a day for ages 1 to 70 and 800 IU (20 mcg) after 70. It sets a Tolerable Upper Intake Level (UL), the most you can take daily without likely harm for the general population, at 4,000 IU (100 mcg) for adults [1].

So a 5,000 IU softgel is above the general-population UL. Higher amounts are sometimes used under a practitioner's guidance, often alongside a blood test for vitamin D status [1]. That's why we suggest checking with your health care practitioner first.

Why vitamins A and K often come with D3

Vitamins A, D, E and K are all fat-soluble [2][1][4][3]. Pairing them in one softgel means one serving, taken with food.

Vitamin K comes in two main forms: K1 (phylloquinone), mostly from leafy greens, and K2 (menaquinones such as MK-4 and MK-7) [3]. If you take warfarin or a similar blood thinner, you need a consistent vitamin K intake, so talk with your doctor before adding any K supplement [3].

D2 vs. D3

Supplements use either vitamin D2 (ergocalciferol) or D3 (cholecalciferol). Both are absorbed well [1]. The label should say which one you're getting.

Vitamin D label checklist

• Form: D3 (cholecalciferol) or D2, stated on the label.
• Amount in mcg and IU, and how it compares to the 4,000 IU adult UL [1].
• What else is inside: A, K1/K2, E, and their amounts.
• Softgel shell: gelatin or plant-based.
• Take-with-food guidance, since these vitamins are fat-soluble.

Why we made ADK Evail this way

Here's how ADK Evail lines up with that checklist: - Form: vitamin D3 at 5,000 IU per serving. - Partners: vitamins A and K1/K2, plus vitamin E isomers (annatto tocotrienols). - Delivery: Evail™ technology in a gelatin softgel. - Use: as directed on the label, typically with a meal containing fat.

Shop the products mentioned:

• ADK Evail | Vitamins A, D & K: vitamins A, D3 (5,000 IU) and K1/K2 in one gelatin softgel.
• Fish Oil High Potency Omega-3 | 1:1 EPA-DHA: 800 mg EPA + 800 mg DHA per 2 softgels, another fat-based daily.
• Ultimate Essentials Pack: ADK Evail with NAC, fish oil, zinc and B-complex in one bundle.

Want the bigger picture? Read our ADK Evail vitamins A, D & K guide.

Free shipping on orders $49+.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

FAQ

How many mcg is 5,000 IU of vitamin D? 5,000 IU equals 125 mcg. The conversion is 1 mcg = 40 IU [1].

Is 5,000 IU of vitamin D3 too much? It's above the 4,000 IU daily Upper Limit set for adults in the general population [1]. Some people use higher amounts under a practitioner's guidance, so check with yours first.

Should I take vitamin D3 with food? Yes. Vitamin D is fat-soluble, so taking it with a meal that contains some fat is a common recommendation [1].

Why is vitamin K paired with vitamin D3? Both are fat-soluble and fit in one softgel. If you take warfarin or a similar anticoagulant, talk with your doctor first, because vitamin K intake needs to stay consistent [3].

What's the difference between D2 and D3? D2 is ergocalciferol and D3 is cholecalciferol. Both are used in supplements and both are absorbed well [1].

References

1. NIH Office of Dietary Supplements. Vitamin D – Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/
2. NIH Office of Dietary Supplements. Vitamin A and Carotenoids – Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
3. NIH Office of Dietary Supplements. Vitamin K – Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/VitaminK-HealthProfessional/
4. NIH Office of Dietary Supplements. Vitamin E – Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/VitaminE-HealthProfessional/