They represent a new therapeutic approach able to act directly on the heart or kidneys, independently of insulin sensitivity (Lopaschuk and Verma, 2020

Additional Monitoring May Be Considered In Research Models Involving: Significant pigmentation variability or extensive freckling Large numbers of moles or atypical pigmentation-related findings UV-response variability and dermatological sensitivity Cardiovascular or significant cardiometabolic conditions Mood-related, psychiatric, or neuroendocrine conditions Neurological sensitivity or chronic migraines Hormonal or melanocortin-related research models Multiple concurrent melanocortin, neuroregulatory, or stimulant-related compounds Avoid or Carefully Evaluate in Research Models With: Known hypersensitivity to peptide compounds Active melanoma or suspicious pigmentation-related findings Severe uncontrolled cardiovascular disease Severe uncontrolled mood-related, psychiatric, or neurological conditions Active severe systemic illness Pregnancy or breastfeeding contexts Additional Research Considerations Because Melanotan II may influence melanocortin, pigmentation-related, and neuroendocrine signaling pathways, research protocols may warrant monitoring of: Pigmentation and melanogenesis-response variability Pigmentation variability involving freckles, moles, or existing pigmentation UV-response variability and dermatological sensitivity Appetite-, mood-, or neuroregulatory-response patterns Overall individual tolerance and pigmentation-response variability Combination protocols involving melanocortin-related, neuroregulatory, or pigmentation-focused compounds may further influence pigmentation and neuroendocrine response pathways

40 Preclinical studies have shown that these effects are mainly mediated trough the effects of GLP-1R activation in the central nervous system (CNS) by the modulation of orexigenic and anorexigenic signaling pathways
doi: 10.1046/j.1365-201x.1996.446304000.x 55
Another potential limitation is that the trials had a one-sequence crossover design, and differences in observation/exposure periods make it difficult to compare safety and tolerability profiles between treatment arms