early 13c., "apparatus for weighing," from Old French balance (12c.) "balance, scales for weighing," also in the figurative sense; from Medieval Latin bilancia , from Late Latin bilanx , from Latin (libra) bilanx "(scale) having two pans," possibly from Latin bis "twice" + lanx "dish, plate, scale of a balance." The accounting sense is from 1580s; the meaning "general harmony between parts" is from 1732; sense of "physical equipoise" is from 1660s. Balance of power in the geopolitical sense is from 1701. Many figurative uses are from Middle English image of the scales in the hands of personified Justice, Fortune, Fate, etc.; . hang in the balance (late 14c.).
Equipoise has one of the longest detection times of any anabolic steroid; if you are a tested athlete you are urged to forgo its use. Equipoise can be detected in the urine for months even after use has been discontinued; some studies have claimed they can trace the drug back to as far as one year from the end of use. In most countries Equipoise is not legally obtainable; in most cases only through purchase from an underground lab can this drug be obtained. For that reason it is very important you understand the laws in the country you live.