the syringe should have "tick" marks denoting certain number or portion of ml's. liquid ancillaries are usually dosed a certain number of mg or mcg (in the case of clen) per 1ml. so it would be accurate to fill up a syringe to the appropriate tick mark and dispense (not inject). alot of liquid ancillaries come with marked droppers but not all of them are marked to the small level that syringes are.