Does calcium work?

Overall Effectiveness Rating for Calcium

The overall effectiveness rating for calcium is 1.5 out of 3. This rating means there is some evidence that using calcium may lead to positive results. This rating also means that some evidence does not back up all claims. Below you can find individual ratings for specific claims.

Overall Confidence Rating for Calcium

There are 2 studies in the database on calcium; the confidence rating is 20. A score above 80 means the effectiveness rating for this supplement is reliable. A score under 80 means there is insufficient evidence to ensure a reliable effectiveness rating. Note, this rating is for calcium as a whole. There are also individual ratings for the claims below.

Products Containing Calcium

Products Containing Calcium
P4 Pre Game Formula
P10 Pre-Workout
Full list of all 96 products containing Calcium.

Individual Claims

The overall ratings above do no necessarily reflect each claim about calcium. Individual claims can have higher or lower ratings. For example, some supplements may have a lot of backing for one claim, but be completely useless for another. Click on claims below for more information.

Performance Claims Effectiveness Rating Confidence Rating
increase strength

Immune Health Claims Effectiveness Rating Confidence Rating
improve immune function


Title of Study
Calcium supplementation and 4-week exercise on blood parameters of athletes at rest and exhaustion
Skeletal muscle strength in young Asian Indian females after vitamin D and calcium supplementation: a double-blind randomized controlled clinical trial