Final answer:
Isotretinoin (Accutane), a form of vitamin A, should be avoided for acne treatment in a female trying to conceive due to its teratogenic effects on the fetus.
Step-by-step explanation:
Vitamin A is the vitamin that should be avoided for acne treatment in a female trying to conceive due to its teratogenic effects on the fetus. Isotretinoin (brand name: Accutane) is a form of vitamin A and is known to cause birth defects if taken during pregnancy. It can lead to abnormalities in various systems of the fetus, including the cardiac, oral, otological, thymic, and central nervous systems.