(It wasnt proven whether the deaths were caused by the peptides or by something else.) Ultimately, the FDA decided not enough data existed to allay the known safety concerns
Safety of astaxanthin for its use as a novel food in food supplements. EFSA Journal 18.2 (2020): e05993
Her community has been active since 2015, which tells you something about whether it works

In laboratory and pre-clinical settings, PT-141 (Bremelanotide) is studied as the defining CNS melanocortin agonist for sexual behaviour neuroscience and melanocortin receptor pharmacology: MC4R pharmacology receptor binding kinetics, Gs/cAMP/PKA signalling, hypothalamic expression mapping, and MC4R-selective research design Melanocortin receptor profiling MC1R/MC3R/MC4R/MC5R binding affinity, SAR studies, and MCR subtype selectivity research Central sexual behaviour neuroscience mPOA and PVN neuronal activation, c-Fos immunoreactivity, and hypothalamic circuit mapping Dopamine system modulation mPOA dopamine release, nucleus accumbens reward integration, and monoaminergic neurotransmitter crosstalk Oxytocin circuit activation PVN oxytocin neuron stimulation and affective/bonding dimension of sexual response HSDD research models female sexual desire deficiency models, melanocortin excitatory pathway engagement, and excitation/inhibition balance Erectile dysfunction research MC4R-mediated erectile pathway, PVN-corpus cavernosum neural connectivity, and PDE5-independent erection modelling CNS vs peripheral mechanism dissection central melanocortin pathway vs nitric oxide/PDE5 axis

Scientific Reports , 7