Is Muscle Recovery good for muscle & strength?

The evidence is still emerging, so it's too early to say for certain. Beyond protein and creatine (covered elsewhere), several other nutritional interventions have meta-analytic support for easing exercise-induced muscle damage: dietary flavonoid-containing polyphenols and nitrate-rich beetroot juice both show modest benefit for muscle-damage markers in meta-analysis, as does curcumin supplementation for delayed-onset muscle soreness. That's reflected in an evidence score of 38/100 for its role in muscle & strength, drawn from 6 studies, with an estimated impact on longevity rated limited (25/100).