Vitamin D3 Extreme™ - 50,000 IU, 24 capsules

SKU: PH324

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Helps combat age-related health issues, improves bone strength and density

  • Promotes calcium absorption
  • Supports healthy immune function

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Research-Supported Benefits:

Supports Healthy Aging. Aging can impact how vitamin D is metabolized in the body increasing the risk of skeletal health issues as well as other age-related health concerns such as impaired brain health, lowered immune function and heart health concerns. Research demonstrates supplementing with vitamin D may help maintain healthy vitamin D levels with age and reduce the risk of age-related health concerns.1

Supports Bone Health. Bone remodeling occurs throughout our lifetime. As we age, the rate of bone tissue generation decreases leading to skeletal weakness and frailty. Research shows that vitamin D, in combination with calcium, can increase bone tissue formation, strength, and density.2, 3

Supports Immune Health. Decreased immunity is common among those over 40. Low levels of vitamin D have been associated with increased bacterial and viral infections. Maintaining appropriate vitamin D levels has been shown to improve the innate and adaptive response of the human immune system, including dental and intestinal infections.4


1. Mark KA, Dumas KJ, Bhaumik D, et al. Vitamin d promotes protein homeostasis and longevity via the stress response pathway genes skn-1, ire-1, and xbp-1. Cell Reports. 2016;17(5):1227-1237. doi:10.1016/j.celrep.2016.09.086  

2. Veldurthy V, Wei R, Oz L, Dhawan P, Jeon YH, Christakos S. Vitamin D, calcium homeostasis and aging. Bone Res. 2016;4(1):1-7. doi:10.1038/boneres.2016.41  doi:10.1038/boneres.2016.41  

3. Hill TR, Aspray TJ, Francis RM. Vitamin D and bone health outcomes in older age. Proceedings of the Nutrition Society. 2013;72(4):372-380. doi:10.1017/S0029665113002036 

4. Ismailova A, White JH. Vitamin D, infections and immunity. Rev Endocr Metab Disord. 2022;23(2):265-277. doi:10.1007/s11154-021-09679-5

  • Vitamin D, a fat-soluble vitamin, is essential to maintaining total body health, yet is not found in many foods. It's needed daily to keep bones and teeth strong over your lifetime, and to ensure the proper functioning of the heart, muscles and nerves - it even helps your blood to clot. A daily regimen of this D3 (cholecalciferol) is the best way to treat and prevent vitamin D deficiency, whether from lack of sunlight, poor nutrition, chronic illness or aging.
  • D3 Extreme™ offers support for healthy bones and supports the immune system by maintaining normal blood levels of calcium and phosphorus, thus promoting calcium absorption.
Supplement Facts
Serving Size: 1 Capsule
Servings Per Container: 24
Amount Per Serving %DV
Vitamin D3 (as Cholecalciferol) 1250 mcg (50,000 IU) 6250%
  • OTHER INGREDIENTS: Gelatin capsule and cellulose.
  • DOES NOT CONTAIN: Dairy, egg, soy, wheat, gluten, corn, sh, shellsh, tree nuts, peanuts.
  • SUGGESTED DAILY USE: As directed by your healthcare practitioner.
  • CAUTION: Vitamin D levels should be monitored and maintained within safe limits.
    Designed for use only under the direction of your healthcare professional. Not intended for use if you are pregnant or nursing. Not formulated for use in children. If you have a medical condition or are taking medications, consult with your healthcare professional before using this product.
  • NOTE: Store in a cool, dry place, away from direct sunlight. Do not use if tamper-evident packaging is broken. KEEP OUT OF REACH OF CHILDREN.

Better Vitamin D Source. Compared to other products that commonly use vitamin D2, we use vitamin D3 (cholecalciferol). This is the natural form and more absorbable and potent compared to D2.

Higher Dose. ProHealth’s Vitamin D3 contains 50,000 IU’s per serving, 12,500% of the daily value. The strongest single dose available on the market at a cost far less than you would pay at the pharmacy.

Meets US Pharmacopeia Standards. Our vitamin D3 meets US Pharmacopeia standards.

No Unnecessary Ingredients. Our vitamin D3 is free from yeast, wheat, gluten, sugar, eggs, peanuts, tree nuts, fish, shellfish, dye and preservatives.

Quality Manufacturing Practices. All of our products are manufactured in an FDA-registered, GMP-certified facility.

Third-Party Tested in the USA. Every batch is third-party tested in US laboratories to ensure the highest quality, purity and potency. Certificates of Analysis are available.

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Customer Reviews

Based on 58 reviews
Vit D to the max

Theraputic dose

Judy S.
Great timely service

Excellent product used by the whole family.

Joan G.

I have been taking this product for at least 10 years. Once a week as recommended by my doctor!

Brian R.
D3 Extreme is great

I’ve been using this supplement for years and my Vit D levels are great. I highly recommend.

Solomon I.
Highest dosage of Vitamin D3

I've been taking Vitamin D3 Extreme for several years now as it was recommended by my doctor. I wasn't able to find the 50,000 IU capsules at any of the local retail pharmacies but was able to order it from ProHealth. It gives me the right amount of Vitamin D3 which I just take every other week to keep my bones strong.

Ellin J.
Happy Survivor

I switched over to ProHealth brand, and have been taking that for many years, setting up an automatic delivery of two bottles every two months. I share extra bottles with family and friends.
The vitamins arrive regularly, and there have been no problems with my orders.

Jesus A.


Jennifer C.
Great product

Easy to order and exactly what the doctor ordered

Darlene C.

Vitamin D3 Extreme™ (50,000 IU, 24 Capsules) by ProHealth

Lynn A.
Excellent service

It comes on time

Frequently asked questions

This product is not intended for daily use. Please consult your healthcare provider to determine the dosage frequency that is right for you.
Since Vitamin D3 does not interfere with circadian rhythm or have stimulant properties, it can be taken any time of day.
Vitamin D3 is a fat-soluble vitamin. For best absorption, take with a meal that contains some fat.
Keep Vitamin D3 at room temperature and out of direct sunlight.
Vitamin D3 side effects are quite rare and have only been observed in those taking excessively high doses.