"In postmenopausal women who received poly-gamma-glutamic acid (PGA) once, the absorption rate of calcium in the intestine was significantly increased, especially in those with below average calcium absorption efficiency. "
Reference paper : Tanimoto, H., Fox, T., Eagles, J., Satoh, H., Nozawa, H., Okiyama, A., Morinaga, Y., & Fairweather-Tait, S.J. (2007). Acute effect of poly-gamma-glutamic acid on calcium absorption in post-menopausal women. Journal of the American College of Nutrition , 26 (6), 645–649.