In meteorology, the term isotherm refers to a contour line that connects points on a weather map that have equal temperatures at a given time. Just as contour lines on topographical maps are used to show gradients of elevation, isotherms are used to show gradients of temperature. Isotherms usually are shown in five- or 10-degree intervals on maps. The temperature differences they delineate are often indicated by different colors. The curve of an isotherm is shaped by variations in temperature across the area being mapped.
Biotin is vital to cell proliferation, which is why it is a valuable tool in hair growth. When ingested, biotin reacts with cell enzymes and plays a vital part in producing amino acids, which are the building blocks of protein.
You should just take biotin, prenatal vitamins are made to support you and a growing fetus. A lot of people think it's the vitamins but it's just the increase in hormones and estrogen that help with nail and hair growth.