Materials, products and services - the Green Guide Online provides details of the life cycle environmental impacts of construction materials and components, and the Green Book is a free online database of products and services.
Spermicides are used globally for birth control, with or without condoms. As the only means of birth control, spermicides are rarely effective. However, in conjunction with condoms, spermicides are somewhat effective in birth control.
The hormones in NuvaRing are the same hormones as in the birth control pill â estrogen and progestin. The hormones in the ring work by. 1  Keeping eggs from leaving the ovaries. 2  Pregnancy cannot happen if there is no egg to join with the sperm.se another method of birth control â like a condom or spermicide â if you have vaginal intercourse during the first week of ring use. The ring can interfere with the placement of the cervical cap, diaphragm, and sponge.