The article treats that last category as one to avoid rather than a legitimate fourth option
Rhythm of carnitine levels in serum and urine of normal subjects
Acknowledgements This research was supported by the National Key R&D Program of China (2018YFC1313304, 2018YFC1313300), National Natural Science Foundation of China (81930065, 81871951), Natural Science Foundation of Guangdong Province (2019A1515010233, 2018B030306049), Pearl River S&T Nova Program of Guangzhou (201806010002), and CAMS Innovation Fund for Medical Sciences (CIFMS) (2019-I2M-5-036)
The objective is alignment with biological rhythms, an approach increasingly reflected in next-generation performance formulations
MOTS-C fits the classic definition of a signaling peptide, whereas 5 Amino 1MQ is a synthetic small molecule that acts as an intracellular blocker