If you notice bruising, redness, or firmness at previous injection sites, these are signs that rotation is even more critical and that you should space out those areas for longer recovery periods
Keeping a written log or using a smartphone application can help track application sites
Michael Lincoff, Kirstine BrownFrandsen, Colhoun HM, Deanfield J, Emerson SS, Sille Esbjerg, et al
What they do produce is a substantial improvement in the quality and recovery of training, body composition over time, and markers of biological age
Ohkama-Ohtsu N, Oikawa A, Zhao P et al (2008) A -glutamyl transpeptidase-independent pathway of glutathione catabolism to glutamate via 5-oxoproline in Arabidopsis