Is galvanized pipe safe for use as a bathroom faucet?
Since galvanized pipe was used for close to 100 years as water supply lines yes it is fine to use in your sink.
Galvanized fell out of favor in the 70’s because it is harder to install but I know a couple of contractors that still use it today for the main into the house because it is tough.
You do want to use dielectric unions for your connection from the galvanized to the copper if you don’t galvanic action will corrode the pipe at the junction very quickly in some cases less than a year in others 3+ it depends on the water.
For those that point to the pipe building up on the inside that takes decades in my experience.  And those that talk about lead in the pipe but use brass and stainless just don’t have a clue that unless the brass is rated for potable water it will contain more lead and even brass that is rated for potable water has lead , just an approved amount. Stainless now we deal with chromium, plastic do we even know some haven’t been in use for that long.
There was a time when lead was used for both pipe and solder those days ended back in the 70’s for solder and much earlier for pipe because lead leaks.
I don’t know of any method of transporting water that California prop 65 doesn't require a warning and I don’t even live there any more but everything has the risk warnings.
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