Peter Gillham's Cal-Mag, High Absorption 2:1 Calcium & Magnesium

What the brand says

Sold as “Peter Gillham's Cal-Mag, High Absorption 2:1 Calcium & Magnesium Citrate Powder; Supports a Healthy Response to Stress, Muscular & Bone Health, Reduce Cramps, Unflavored 16 oz”