betaine

Original Research

Efficacy of creatine supplementation combined with resistance training on muscle strength and muscle mass in older females: A systematic review and meta-analysis
Pinheiro dos Santos EE, de Araújo RC, Candow DG, et al. 
Nutrients. 2021 Oct 24; 13(11), 3757. doi: 10.3390/nu13113757.

Effects of chronic betaine supplementation on performance in professional young soccer players during a competitive season: a double blind, randomized, placebo-controlled trial
Nobari H, Cholewa JM, Castillo-Rodríguez A, et al. 
J Int Soc Sports Nutr. 2021 Oct 18;18(1):67. doi: 10.1186/s12970-021-00464-y. 

Astaxanthin supplementation increases glutathione concentrations but does not impact fat oxidation during exercise in active young men. 
McAllister MJ, Mettler JA, Patek K, et al.
Int J Sport Nutr Exerc Metab. 2021 Oct 5:1-8. doi: 10.1123/ijsnem.2021-0138. Epub ahead of print. 

The effects of phosphocreatine disodium salts plus blueberry extract supplementation on muscular strength, power, and endurance.
Anders JPV, Neltner TJ, Smith RW, et al. 
J Int Soc Sports Nutr. 2021 Sep 9;18(1):60. doi: 10.1186/s12970-021-00456-y.  

Effects of betaine supplementation on markers of  metabolic flexibility, body composition, and anaerobic performance in active college-age females.
Waldman HS, Bryant AR, McAllister MJ. 
J Diet Suppl. 2021 Sep 3:1-17. doi: 10.1080/19390211.2021.1973644. Epub ahead of print. 

Original Research 

The effects of omega-3 and branched-chain amino acids supplementation on serum apoptosis markers following acute resistance exercise in old men
Sheikholeslami-Vatani D, Ahmadi S, Faraji H.
J Aging Phys Act. 2018 Aug 17:1-23. doi: 10.1123/japa.2017-0404. [Epub ahead of print]

Multiday pomegranate extract supplementation decreases oxygen uptake during submaximal cycling exercise, but cosupplementation with N-acetylcysteine negates the effect
Crum EM, Barnes MJ, Stannard SR.
Int J Sport Nutr Exerc Metab. 2018 Aug 1:1-7. doi: 10.1123/ijsnem.2017-0407. [Epub ahead of print].

The effects of chronic betaine supplementation on body composition and performance in collegiate females: a double-blind, randomized, placebo controlled trial 
Cholewa JM, Hudson A, Cicholski T, et al.
J Int Soc Sports Nutr. 2018 Jul 31;15(1):37. doi: 10.1186/s12970-018-0243-x.

Reviews

Multi-ingredient pre-workout supplements, safety implications, and performance outcomes: a brief review
Harty PS, Zabriskie HA, Erickson JL, et al. 
J Int Soc Sports Nutr. 2018 Aug 8;15(1):41. doi: 10.1186/s12970-018-0247-6.