Melanocortins Protect against Diabetes Caused by Obesity Encyclopedia MDPI PDF) Association of tanning injection with hypercortisolism, hyperglycaemia and ketosis in type 1 diabetes mellitus Melanotan II A Sun Kissed Look, and a Confident You. You Should Avoid Using Nasal Tanning Sprays 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.