Melanotan Tanning Peptides: Safe Use, Side Effects & How It Works Scientifically 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. How Long Does It Take For Melanotan To Work? That quick tan injection is NOT worth the risk., Melanotan peptide injections stimulate pigment cells, and its use has been linked to rapid changes in moles, including the potentially fatal skin Don't risk using tanning products containing melanotan Therapeutic Goods Administration (TGA)