[1] Wankhede S, Langade D, Joshi K, Sinha SR, Bhattacharyya S. Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial. J Int Soc Sports Nutr. 2015 Nov 25; 12:43. doi: 10.1186/s12970-015-0104-9. PMID: 26609282; PMCID: PMC4658772
[2] Gonzales-Arimborgo C, Yupanqui I, Montero E, Alarcón-Yaquetto DE, Zevallos-Concha A, Caballero L, Gasco M, Zhao J, Khan IA, Gonzales GF. Acceptability, Safety, and Efficacy of Oral Administration of Extracts of Black or Red Maca (Lepidium meyenii) in Adult Human Subjects: A Randomized, Double-Blind, Placebo-Controlled Study. Pharmaceuticals (Basel). 2016 Aug 18;9(3):49. doi: 10.3390/ph9030049. PMID: 27548190; PMCID: PMC5039502
[3] Pomportes L, Brisswalter J, Hays A, Davranche K. Effects of Carbohydrate, Caffeine, and Guarana on Cognitive Performance, Perceived Exertion, and Shooting Performance in High-Level Athletes. Int J Sports Physiol Perform. 2019 May 1;14(5):576-582. doi: 10.1123/ijspp.2017-0865. Epub 2019 Apr 11. PMID: 30300016
[4] Arring NM, Millstine D, Marks LA, Nail LM. Ginseng as a Treatment for Fatigue: A Systematic Review. J Altern Complement Med. 2018 Jul;24(7):624-633. doi: 10.1089/acm.2017.0361. Epub 2018 Apr 6. PMID: 29624410.
[5] Smith, A.E., Fukuda, D.H., Kendall, K.L. et al. The effects of a pre-workout supplement containing caffeine, creatine, and amino acids during three weeks of high-intensity exercise on aerobic and anaerobic performance. J Int Soc Sports Nutr 7, 10 (2010). https://doi.org/10.1186/1550-2783-7-10
[6] Hemilä, H. The effect of vitamin C on bronchoconstriction and respiratory symptoms caused by exercise: a review and statistical analysis. All Asth Clin Immun 10, 58 (2014). https://doi.org/10.1186/1710-1492-10-58.
[7] Sarmiento A, Diaz-Castro J, Pulido-Moran M, Kajarabille N, Guisado R, Ochoa JJ. Coenzyme Q10 Supplementation and Exercise in Healthy Humans: A Systematic Review. Curr Drug Metab. 2016;17(4):345-58. doi: 10.2174/1389200216666151103115654. PMID: 26526835 Kwon YJ, Son DH, Chung TH,
[8] Wolffenbuttel BHR, Wouters HJCM, Heiner-Fokkema MR, van der Klauw MM. The Many Faces of Cobalamin (Vitamin B12) Deficiency. Mayo Clin Proc Innov Qual Outcomes. 2019 May 27;3(2):200-214. doi: 10.1016/j.mayocpiqo.2019.03.002. PMID: 31193945; PMCID: PMC6543499
[9] Huaping Shang, Shehua Cao et al. Glabridin from Chinese herb licorice inhibits fatigue in mice. Afr J Tradit Complement Altern Med. 2009 Oct 15;7(1):17-23. doi: 10.4314/ajtcam.v7i1.57225. PMID: 21304608. DOI: 10.4314/ajtcam.v7i1.57225.