Botox is FDA-approved and regulated. The product itself is manufactured with strict oversight. When injected properly, Botox is harmless to the body beyond its effect on the targeted nerve.
This makes it even more important to connect with a professional provider. Salons and self-administered injections obtained online are unsafe since there's no way to ensure their injectables were correctly manufactured.
Improper needle placement or an inappropriate dose may cause allergic reactions, permanent nerve damage, or even blindness.