Tagawa et al. 2020
A meta-analysis using meta-regression techniques on protein intake and lean body mass, which found an inflection point between 1.3 to 1.5 grams per kilogram for optimal protein intake, and included both resistance training and non-resistance training studies.
Videos Mentioning Tagawa et al. 2020

Protein, Fish Oil, Glycogen, and What Limits Muscle Growth (Episode 53)
Stronger By Science
A meta-analysis using meta-regression techniques on protein intake and lean body mass, which found an inflection point between 1.3 to 1.5 grams per kilogram for optimal protein intake, and included both resistance training and non-resistance training studies.

Protein, Lactate, and Strength Phases to Boost Hypertrophy (Episode 52)
Stronger By Science
A meta-analysis on optimal protein intake, which found an inflection point around 1.3-1.5 g/kg/day, but continued benefits up to 2.2 g/kg/day, consistent with Morton et al. but not completely flat beyond the inflection point.