Melanotan II (Tan Jabs): Why They're Not Worth The Risk Tanning from the inside out = Highly Dangerous and Illegal!, Many products advertised on social media platforms promising a tan from the inside out or a tan without sun such as injectable Say No to Nasal Tanning Sprays Dermatology Times How long does Melanotan Nasal Spray Take to Work? Avoid nasal tanning sprays or nasal tanners entirely. These products promise an all over tan without sun exposure but they are unregulated, can be unsafe, and contain potentially risky substances like Melanotan 2.