Yes and no. It's not synthetic, but it's not naturally occurring, either (at least, not at levels that are useful). A lot of work went into the production pro

Yes and no. It's not synthetic, but it's not naturally occurring, either (at least, not at levels that are useful). A lot of work went into the production process before penicillin actually became viable as an antibiotic (hence the 16-year gap between discovery and first wide scale use): https://en.wikipedia.org/wiki/Penicillin#Mass_production https://en.wikipedia.org/wiki/Penicillin#Mass_production