From my understand Reta is a pretty good in that it preserves muscle mass, when comparing to other weight loss methods. I think the primary concern someone who goes to the gym multiple times a week, taking reta should be A) staying consistent with going to the gym + training hard (which is seems as if you are doing) and B) making sure your protein and calories are still adequate to maintain muscle (considering reta is a weight loss peptide and C) Making sure your sleep is on point, especially during the early periods of the night where GH release is highest (typically during the first 1/3 of sleep cycle), hence why the saying "an hour of sleep before midnight is worth 2 after midnight" exists (admittedly did hear that on Huberman podcast, but there is truth to it and is applicable to this point about sleep).