On the muscle preservation front, that means lifting weights to discourage muscle wasting and eating more protein than usualcontemporary evidence-based protein recommendations for active lifters range from 1.6 to 2.2 grams per kilogram of body weight
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(PubMed) van der Put NM, van den Heuvel LP, Steegers-Theunissen RP, et al
the published research on the LR3 analog specifically is primarily in (a) mechanistic and pharmacokinetic studies in animals and isolated tissues, (b) cell culture applications (it is widely used as a serum-free supplement for stem cell and cell-line maintenance), and (c) analytical/anti-doping methodology (LR3 is on the World Anti-Doping Agency prohibited list)
Some actually contain the real drug, which should be given by prescription only