From what I understand, aside from the GLP drugs and the amylin agonists, there aren't really any other peptides that produce fat loss or weight loss to any meaningful extent. Developing any drug that genuinely worked and wasn't toxic required roughly 40 years of fairly intensive research, so creating something that leads to weight loss is extremely difficult — largely because the body relies on about 20 or so separate but interconnected hormonal systems to regulate weight and appetite, and evolution has strongly safeguarded it against interference.
Growth hormone and secretagogues may shift the overall muscle-to-fat ratio somewhat, but they don't reduce total body weight, and they come with a good number of adverse effects too.
Tesofensine is one of the few compounds obtainable from China that has at least some evidence behind it for working and being relatively safe, though it isn't a peptide. Even so, many people have struggled to dial in the right dose, since it has a very long half-life and a fair number of side effects that tend to worsen considerably over time as it accumulates in the body. In a couple of studies, however, it did deliver around 10% weight loss. It is essentially an SNRI antidepressant, with added dopamine reuptake inhibition on top of serotonin and noradrenaline effects.
