A vitamin D-like compound used medically to treat low calcium levels and bone disorders, made by adding hydrogen atoms to tachysterol.
From 'di-' (two) + 'hydro-' (hydrogen) + 'tachysterol' (a steroid related to vitamin D). Synthesized in the 20th century as researchers sought ways to treat calcium deficiency without using natural vitamin D.
Dihydrotachysterol is chemistry's clever shortcut—instead of waiting for sun exposure to make vitamin D, doctors can give this synthetic molecule that works almost identically to help patients keep their bones strong and calcium in balance.
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