Jigsaw Health MagSRT B-Free combines the highly absorbable form of magnesium, di-magnesium malate from Albion, with their proprietary Sustained Release Technology (SRT), without the B-vitamins. 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. Each bottle of MagSRT B-Free from Jigsaw Health provides a two-month supply if taken at the recommened dose.