A form of calcium

Calcium carbonate supplements

4,133 calcium products in the NIH label database list calcium as calcium carbonate (21% of the 19,724 calcium products); their median is 200 mg of calcium per serving, against 115 mg across all calcium products; the 57 whose only supplement ingredient is calcium list a median of 600 mg (DSLD version 9.4.0, January 2026).

How does calcium carbonate compare with the other forms?

The median amount of calcium per serving in products naming each form; the count in brackets. The amount is the calcium the label gives, as printed (the Supplement Facts row normally states the element; a row named as the compound usually gives the compound's weight and is left out of these figures).

Median calcium per serving by form

Source: Supplement Facts rows and their forms, NIH ODS Dietary Supplement Label Database version 9.4.0, current labels.

Products: 4,1333,056 on the market
Median calcium per serving: 200 mgall calcium products: 115 mg
Share of calcium products: 21%4,133 of 19,724

Is the amount the calcium or the whole calcium carbonate?

A Supplement Facts row normally states the calcium itself (a row like "Calcium (as calcium carbonate)"); a row named as the compound (a row like "Calcium carbonate") usually states the compound's weight, which includes what the calcium is bound to and is larger than the calcium it supplies. The front of a bottle may print either. Of the 4,133 products here, 4,112 give the calcium in its own row (16 of them an amount far outside what other labels list, or one their own %DV disagrees with); 1 gives only a row named as the compound, left out of the medians and counts on this site; 20 give no amount of their own or one in another unit.

The adult Tolerable Upper Intake Level for calcium is 2,500 mg a day; it covers total intake, adults 19-50, 2,000 mg from 51 years. At the most servings their labels direct, 16 of the 4,096 calcium carbonate products with a plausible amount (0.4%) give more than that.

Source: Supplement Facts rows of each product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; upper limit: Institute of Medicine Dietary Reference Intakes (2011) (what counts as plausible).

What else do these products contain?

Ingredients most often listed alongside it, with the median amount in these products and in all products
Ingredient	Share of these products	Median here	Median, all products
Magnesium	69%	100 mg	86 mg
Vitamin D	67%	10 mcg	15 mcg
Vitamin C	62%	150 mg	100 mg
Vitamin B6	59%	10 mg	6 mg
Zinc	59%	15 mg	11 mg
Niacin	57%	24 mg	20 mg
Vitamin B12	56%	25 mcg	36 mcg
Riboflavin	54%	6.4 mg	4 mg
Folate	54%	400 mcg	400 mcg
Thiamin	54%	7 mg	5 mg

Which products are they?

60 of the 4,133 (on-market products first, the newest label first), ordered by the amount of calcium per serving, largest first; an amount that looks like a slip or a compound's weight comes last, marked.

Cal-Mag Citrate with Vitamin D-3 & K-2 2:1 RatioSolaray1,000 mg
Calcium Magnesium ZincSolaray1,000 mg
Calcium with Vitamin D3 Powder UnflavoredKirkman1,000 mg
Enhanced Absorption Calcium Magnesium 2:1 RatioSolaray1,000 mg
Calcium Citrate with Vitamin D-3 1000 mgSolaray1,000 mg
Calcium Magnesium Zinc & Vitamin D3Pure Naturals1,000 mg
Enhanced Absorption Calcium Magnesium 2:1 Ratio with Vitamin D-2Solaray1,000 mg
OsteoPrime Plus Calcium & MagnesiumNature's Way800 mg
Calcium & MagnesiumButterfly Express667 mg
Cal-600Carlson600 mg
Liquid Calcium & MagnesiumSwanson600 mg
Calcium & Magnesium Mineral Complex 750 mgNature's Way500 mg
Calcium Intensive CareProCaps Laboratories500 mg
Essential MultiV Drink Raspberry LemonadeShaklee450 mg
Active Women's MultivitaminSuper Nutrition400 mg
Calcium & Magnesium Gels 400 mg:200 mgCarlson400 mg
T-ThriveJust Ripe Nutrition367 mg
5HTP+ 200 mgNumber One Nutrition328 mg
Ease PlusHealth Concerns292 mg
Lean Shake Burn Chocolate FudgeGNC Total Lean250 mg
Lean Shake Burn StrawberryGNC Total Lean250 mg
Vitality Calcium CompleteVitality For Life250 mg
Double XNutrilite250 mg
Energy & MetabolismGNC Mega Men210 mg
Sport MultivitaminGNC Mega Men210 mg
Daily One for Men 50+Windmill210 mg
High Potency Softgel MultiSwanson200 mg
Maxi-HairCountry Life200 mg
Maxi-Hair PlusCountry Life200 mg
FeelFit Pea Protein Shake Simply1 Coffee FlavorArbonne153 mg
FeelFit Pea Protein Shake Simply1 Strawberry FlavorArbonne153 mg
FeelFit Pea Protein Shake Simply1 Vanilla FlavorArbonne153 mg
Complete Thymic FormulaLogos Nutritionals150 mg
Multi+Butterfly Express140 mg
Prenatal DHA+ GingerNoor Vitamins133 mg
Alive! Men's 50+ Complete MultivitaminNature's Way130 mg
Alive! Men's 50+ Ultra Potency Complete MultivitaminNature's Way130 mg
Alive! Men's Ultra MultivitaminNature's Way130 mg
Alive! Women's Ultra MultivitaminNature's Way130 mg
Men's Daily MultivitaminNutrilite130 mg
Glucofort MaxJustified Laboratories100 mg
Selenium 200 mcgCountry Life100 mg
Special Two Multi VitaminBaar Nature's Blessing100 mg
Sweet Relief Glycogen Support ExtremeJustified Laboratories100 mg
Betaine Hydrochloride 600 mg With PepsinCountry Life100 mg
Keto ElectrolytesCodeage99 mg
SAM-e & TMG Natural Lemon FlavorXYMOGEN75 mg
Women's Golden MultivitaminSolaray75 mg
Melatonin 3 mgNatrol63 mg
D3+K2 5,000 IU D3 / 120 mcg K2Wonder Labs55 mg
Sight CareJust Ripe Nutrition50 mg
Soy-Free Phosphatidyl Serine 150 mgNOW50 mg
Dry XTJacked Factory50 mg
Men's MultivitaminNumber One Nutrition50 mg
Daily VitaminWindmill45 mg
Quantum Glutathione SupportQuantum Nutrition Labs38 mg
Buffered Vitamin C 500 mgSolaray20 mg
Advanced Memory FormulaJust Ripe Nutrition20 mg
Colostrum GOLD First Milk 1000 mgSunshine Naturals10 mg
Calcium D3 + K2 + B12O Orgeuos0.6 mg

Source: NIH ODS Dietary Supplement Label Database version 9.4.0; the form each label names for its row. Daily Values: the FDA's Daily Value page.

Which brands make them?

21st Century (123), Nature's Way (94), ProCaps Laboratories (77), Douglas Laboratories (75), Bronson (65), Puritan's Pride (56), DC (55), Country Life (53), Wonder Laboratories (51), Vitamin World (49).