BMJ Report: Vitamin D and SARS-CoV-2 virus/COVID-19 disease

"As a key micronutrient, vitamin D should be given particular focus — not as a ‘magic bullet’ to beat COVID-19... — but rather as part of a healthy lifestyle strategy to ensure that populations are nutritionally in the best possible place."

Maximum D3® Trays
Maximum D3


"MAX D3 cured my deficiency which was so severe that I had secondary hyperparathyroidism.

[I] was severely deficient when the endocrinologist told me to take your product. Have been perfect ever since."

  -Barbara Barlow MD, FACS, FAAP
   Professor of Surgery in Epidemiology
   Columbia University Medical Center

325 mcg (13,000 IU) Vitamin D3 Supplement


Maximum D3® is a high-quality vitamin D3 supplement that helps support bone health, calcium absorption, and immune system function. It is intended to be taken once a week on a regular basis.

Maximum D3® was the first high-dose vitamin D3 supplement marketed in the United States.  It was designed by Dr. Grote when he was an internist in his hometown of Pittsfield, IL.  Dr. Grote strongly believes in the benefits of vitamin D (cholecalciferol).  He was frustrated that high-quality supplements were not available to his patients; he therefore carefully formulated Maximum D3® to have superior quality and consistency.

Vitamin D is important because it aids in the absorption of calcium and is essential for bone, muscle and immune system health.  The two main ways to get vitamin D are through sunlight and taking vitamin D supplements.  Maximum D3® is designed to be an acceptable and reliable substitute to sun exposure.

Maximum D3® is expected to maintain adequate blood levels of vitamin D when taken weekly by adults.

Using Maximum D3® can assist in the prevention of osteoporosis.

  • Convenient Once a Week Dose
  • High-Quality
  • Made in the USA
  • Non-GMO
  • Gluten-Free
  • No Prescription Needed

Maximize your well-being with Maximum D3®

Discover Potential Health Benefits

Numerous research studies link optimal vitamin D levels to better health benefits.

Maximum D3 Full Box

The Sunshine Vitamin

Maximum D3®

Vitamin D is called the sunshine vitamin because it's produced in the skin in response to sunlight.  Sunlight is the main source of Vitamin D but many people benefit from supplements because they don't get enough sun exposure or they lack absorption of Vitamin D due to medical conditions and/or dark pigmentation.  Vitamin D3 is often considered superior to Vitamin D2 because it is better absorbed and utilized by the body.