Day-Cal

The label, verified: what is in it, at what amounts, and why the formula is built this way.

Last reviewed August 2026 · MDR · Product page

Every ingredient, as printed on the label

  • Vitamin D3 (as Cholecalciferol)
  • Biotin
  • Calcium (as Tricalcium Phosphate and Calcium Citrate)
  • Phosphorus (as Tricalcium Phosphate)
  • Magnesium (as Magnesium Oxide, Magnesium Citrate & TRAACS Magnesium Bisglycinate Chelate)
  • Zinc (as Zinc Gluconate)
  • Copper (as Copper Gluconate)
  • Manganese (as Manganese Aspartate)
  • Boron (as Boron Glycinate)
  • Vitamin K2 (as K2VITAL Menaquinone-7)
  • MSM (Methylsulfonylmethane)
  • Resveratrol (as resVida)
  • Fucoidan (from Brown Seaweed Whole Plant, Laminaria Japonica)
  • Silica (from Bamboo Stem Extract, Bambusa Vulgaris)
  • Gelatin
  • Vegetable Stearates
  • Silicon Dioxide
  • Rice Flour

The actives

Vitamin D3 (as Cholecalciferol)25 mcg (1000 IU) · 125% DV
1000 IU per serving. Supports calcium absorption and bone mineralization, and helps maintain a healthy immune response.*
Biotin100 mcg · 333% DV
Supports the body's role in maintaining healthy hair, skin, and nails.*
Calcium (as Tricalcium Phosphate and Calcium Citrate)500 mg · 38% DV
The structural mineral for bones and teeth. Day-Cal pairs two well-tolerated calcium forms so the body has options for absorption.*
Phosphorus (as Tricalcium Phosphate)233 mg · 19% DV
After calcium, the most abundant mineral in the body — a structural partner in bones and teeth.*
Magnesium (as Magnesium Oxide, Magnesium Citrate & TRAACS® Magnesium Bisglycinate Chelate)100 mg · 24% DV
Three complementary forms of magnesium. Magnesium supports healthy bones and contributes to over 300 enzyme reactions, including energy production and neuromuscular function.*
Zinc (as Zinc Gluconate)5 mg · 45% DV
A trace mineral that supports bone matrix formation and the body's normal immune function.*
Copper (as Copper Gluconate)0.5 mg · 56% DV
Supports the cross-linking of collagen in connective tissue and bone.*
Manganese (as Manganese Aspartate)1 mg · 43% DV
A trace co-factor involved in bone formation and cartilage health.*
Boron (as Boron Glycinate)3 mg
A trace mineral that supports the body's metabolism of calcium and magnesium.*
Vitamin K2 (as K2VITAL® Menaquinone-7)90 mcg · 75% DV
The most active form of K2 (MK-7), derived from algae. Helps activate Gla-proteins that direct calcium toward bones and teeth.*
Proprietary Blend89 mg
MSM (Methylsulfonylmethane), Fucoidan (from Brown Seaweed whole plant, Laminaria japonica), resVida® Resveratrol (from Bamboo stem extract, Bambusa vulgaris), and Silica (from Rice flour). MSM provides bioavailable sulfur for connective tissue; Fucoidan supports the body's bone-building cells and immune function; Resveratrol contributes antioxidant support; Silica supports nail, hair, and bone integrity.*
Other ingredients
Gelatin, Vegetable Stearates, Silicon Dioxide, Rice Flour.

Why it’s built this way

MDR built Day-Cal on a belief earned over more than thirty years in nutrition science: not all calcium formulas are created equal. Most give you calcium and stop there — yet the skeleton remodels itself every single day, and that work draws on far more than one mineral. So we surrounded 500 mg of calcium with the partners it depends on: magnesium, phosphorus, Vitamin D3, and a quiet cast of trace minerals — zinc, copper, manganese, and boron — that most bone formulas quietly leave out. Every amount is printed right on the panel, because the formula is the whole point.

Then we went further. Day-Cal uses K2VITAL® MK-7, the most active form of Vitamin K2, derived from algae — the nutrient that helps direct calcium toward bones and teeth, where the body wants it. We added the ingredients you almost never find in a calcium product: resVida® Resveratrol, the premium standardized form Harvard researchers made famous, for antioxidant support; Fucoidan from brown seaweed; MSM for connective tissue; and Biotin and Silica for hair, skin, and nails. No dyes, no gluten.

Quality

  • Made by MDR, an American company with more than 30 years in nutrition science
  • No dyes and no gluten
  • Backed by a 90-day satisfaction guarantee