hi vipul, welcome to health care magic, i would advise you to consult your physician for the root cause of your weakness.After examination he may advise you some blood tests etc.it would be better to look for the real cause of your problem.
anyways,simrose cap contains evening primrose oil which has GLA (gamma linolenic acid). Its an essential fatty acid
.Its commonly advised for eczema
and in some rheumatic arthritis
patients and also for menstrual problems in female.