Day-Cal

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 (from Carbonate, Aquamin Red Algae and Citrate)
  • Magnesium (from Aquamin Red Algae, Oxide, and TRAACS Magnesium Bisglycinate)
  • 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)
  • Methylcellulose Capsule
  • Magnesium Stearate

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.*
Biotin, 60 mcg · 200% DV
Supports the body's role in maintaining healthy hair, skin, and nails.*
Calcium (from Carbonate, Aquamin® Red Algae and Citrate), 500 mg · 39% DV
The structural mineral for bones and teeth. Day-Cal draws it from three sources, including Aquamin®, a mineral-rich red algae from the sea.*
Magnesium (from Aquamin® Red Algae, Oxide, and TRAACS® Magnesium Bisglycinate), 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 · 44% 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), 120 mcg
The most active form of K2 (MK-7). Helps activate Gla-proteins that direct calcium toward bones and teeth.*
Proprietary Blend, 96 mg
MSM (Methylsulfonylmethane), Fucoidan (from Brown Seaweed whole plant, Laminaria japonica), resVida® Resveratrol, and Silica (from Bamboo stem extract, Bambusa vulgaris). 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
Methylcellulose Capsule, Magnesium Stearate.

Why it’s built this way

MDR built Day-Cal on something learned over more than thirty years in nutrition science: most calcium formulas give you calcium and stop there. Yet the skeleton remodels itself every 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, Vitamin D3 and trace minerals.

Day-Cal uses K2VITAL® MK-7, the most active form of Vitamin K2, the nutrient that helps direct calcium toward bones and teeth. We added the ingredients you almost never find in a calcium product: resVida® Resveratrol, the standardized form used in published research, 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 40 years in nutrition science
  • No dyes and no gluten