Writing on capsules with permanent markers (alcohol based) seems like a not good idea. but friend working in pharmacy told me, that it shouldn't be a problem and that ink is no harm form body.
Anybody knows a good, healthy method for tagging capsules with some bio pen or color, that won't just come off so easily?
Anybody knows a good, healthy method for tagging capsules with some bio pen or color, that won't just come off so easily?

pls, move it to proper place.