According to NYS BON, it is perfectly legal for you to give botox injections.
"Can a Registered Professional Nurse (RN) administer botox, sclera therapy,
dermabrasion, laser hair removal and other alternative or cosmetic procedures to a
Answer: Yes. The RN, who has been found competent in these procedures, may carry them
out upon the prescription of an authorized provider who has examined the patient."
I have no idea what state you live in.
But it says right before, this:
"Can a Registered Professional Nurse (RN) be hired by a business corporation to
Answer: No. Business ventures such as med spas, nutrition stores and durable equipment
companies may not hire licensed professionals to provide professional health care services
in New York State."