Though the most common ingredient in the spermicide is nonoxynol-9, it is believed that there are spermicides which are lactic acid based. They use lactic acid anhydride as the chief component. Therefore, you should not be surprised to find a spermicide containing lactic acid.
Use of lactic acid as a contraceptive has been reportedly seen in the ancient times also, where the lactic acid was allowed to be fermented and used as a birth control measure. Egyptian women reportedly used cotton soaked with lactic acid anhydride and inserted it into the vagina. It was reported as early as 1550 B.C. that a mixture of acacia leaves, dates and honey can prevent pregnancy. It is important to note that when acacia leaves are broken down, they convert into lactic acid. This resembles what is called as spermicide in modern times.
Hence, it is not wrong to conclude that lactic acid has an important role to play in birth control and that modern day usage of lactic acid can be done via spermicide. A spermicide, Contra Gel, comes in a 60 ml tube that contains only natural ingredients like water, lactic acid, which in other words is called milk acid. It also includes sodium lactate, which is a natural salt from fermentation. It is always believed to be safer with anything that has natural ingredients in it. There is one more type of spermicide called Femprotect that contains lactic. This is a spermicide in the form of a jelly and has to be used with a diaphragm or cervical cap.
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