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Prefert® is a lubricant for couples who wish to have children. It is used during sexual intercourse during ovulation. During ovulation, the properties of the cervix and cervical mucus change. This is basic at the time of ovulation. Prefert® Vaginal Gel has the same pH value (7.0 to 7.4) as the cervical mucus during the fertile days. With a neutral pH value of 7.2, Prefert® protects ...