Rex Halwa Salab is an ayurvedic medicine Secondary and off-label uses of Rex Halwa Salab have also been mentioned below. The correct dosage of Rex Halwa Salab depends on the patient's age, gender, and medical history. This information has been provided in detail in the dosage section. Fertility booster capsules enhance reproductive health, balance hormones, improve egg quality, increase sperm count, and support overall fertility.