Jigsaw Health Mag SRT combines the highly absorbable form of magnesium, di-magnesium malate from Albion, with their proprietary Sustained Release Technology (SRT). SRT slows down the release of magnesium to spread it out over eight hours. This allows for maximum absorption, while eliminating the digestive discomfort often caused by other high-dose magnesium supplements. A two-month supply in every bottle (if taken at the recommended dose).