1. Wilson JM, Lowery RP, Joy JM, Andersen JC, Wilson SMC, Stout JR, Duncan N, Fuller JC, Baier SM, Naimo MA, et al. The effects of 12 weeks of beta-hydroxy-beta-methylbutyrate free acid supplementation on muscle mass, strength, and power in resistance-trained individuals: a randomized, double-blind, placebo-controlled study. Eur J Appl Physiol 2014;114:1217–27.
2. Wilson JM, Lowery RP, Joy JM, Walters JA, Baier SM, Fuller JCJ, Stout JR, Norton LE, Sikorski EM, Wilson SMC, et al. β-Hydroxy-β-methylbutyrate free acid reduces markers of exercise-induced muscle damage and improves recovery in resistance-trained men. Br J Nutr 2013;110:538–44.
3. Wilkinson DJ, Hossain T, Hill DS, Phillips BE, Crossland H, Williams J, Loughna P, Churchward-Venne TA, Breen L, Phillips SM, et al. Effects of leucine and its metabolite β-hydroxy-β-methylbutyrate on human skeletal muscle protein metabolism. J Physiol 2013;591:2911–23.
4. Townsend JR, Hoffman JR, Gonzalez AM, Jajtner AR, Boone CH, Robinson EH, Mangine GT, Wells AJ, Fragala MS, Fukuda DH, et al. Effects of β-Hydroxy-β-methylbutyrate Free Acid Ingestion and Resistance Exercise on the Acute Endocrine Response. Int J Endocrinol 2015;2015:856708.
5. Townsend JR, Fragala MS, Jajtner AR, Gonzalez AM, Wells AJ, Mangine GT, Robinson EH4, McCormack WP, Beyer KS, Pruna GJ, et al. β-Hydroxy-β-methylbutyrate (HMB)-free acid attenuates circulating TNF-α and TNFR1 expression postresistance exercise. J Appl Physiol (1985) 2013;115:1173–82.
6. Tinsley GM, Givan AH, Graybeal AJ, Villarreal MI, Cross AG. β-Hydroxy β-methylbutyrate free acid alters cortisol responses, but not myofibrillar proteolysis, during a 24-h fast. Br J Nutr 2018;119:517–26.
7. Robinson EH4, Stout JR, Miramonti AA, Fukuda DH, Wang R, Townsend JR, Mangine GT, Fragala MS, Hoffman JR. High-intensity interval training and β-hydroxy-β-methylbutyric free acid improves aerobic power and metabolic thresholds. J Int Soc Sports Nutr 2014;11:16,16. eCollection 2014.
8. Redd MJ, Hoffman JR, Gepner Y, Stout JR, Hoffman MW, Ben-Dov D, Funk S, Church DD, Avital G, Chen Y, et al. The effect of HMB ingestion on the IGF-I and IGF binding protein response to high intensity military training. Growth Horm IGF Res 2017;32:55–9.
9. Miramonti AA, Stout JR, Fukuda DH, Robinson EH4, Wang R, La Monica MB, Hoffman JR. Effects of 4 Weeks of High-Intensity Interval Training and β-Hydroxy-β-Methylbutyric Free Acid Supplementation on the Onset of Neuromuscular Fatigue. J Strength Cond Res 2016;30:626–34.
10. Lowery RP, Joy JM, Rathmacher JA, Baier SM, Fuller JCJ, Shelley MC2, Jäger R, Purpura M, Wilson SMC, Wilson JM. Interaction of Beta-Hydroxy-Beta-Methylbutyrate Free Acid and Adenosine Triphosphate on Muscle Mass, Strength, and Power in Resistance Trained Individuals. J Strength Cond Res 2016;30:1843–54.
11. Hoffman JR, Gepner Y, Stout JR, Hoffman MW, Ben-Dov D, Funk S, Daimont I, Jajtner AR, Townsend JR, Church DD, et al. β-Hydroxy-β-methylbutyrate attenuates cytokine response during sustained military training. Nutr Res 2016;36:553–63.
12. Gonzalez AM, Stout JR, Jajtner AR, Townsend JR, Wells AJ, Beyer KS, Boone CH, Pruna GJ, Mangine GT, Scanlon TM, et al. Effects of β-hydroxy-β-methylbutyrate free acid and cold water immersion on post-exercise markers of muscle damage. Amino Acids 2014;46:1501–11.
13. Gonzalez AM, Fragala MS, Jajtner AR, Townsend JR, Wells AJ, Beyer KS, Boone CH, Pruna GJ, Mangine GT, Bohner JD, et al. Effects of β-hydroxy-β-methylbutyrate free acid and cold water immersion on expression of CR3 and MIP-1β following resistance exercise. Am J Physiol Regul Integr Comp Physiol 2014;306:483.
14. Fuller JC, Sharp RL, Angus HF, Khoo PY, Rathmacher JA. Comparison of availability and plasma clearance rates of β-hydroxy-β-methylbutyrate delivery in the free acid and calcium salt forms. Br J Nutr 2015;114:1403–9.
15. Fuller JCJ, Sharp RL, Angus HF, Baier SM, Rathmacher JA. Free acid gel form of β-hydroxy-β-methylbutyrate (HMB) improves HMB clearance from plasma in human subjects compared with the calcium HMB salt. Br J Nutr 2011;105:367–72.
16. Din USU, Brook MS, Selby A, Quinlan J, Boereboom C, Abdulla H, Franchi M, Narici MV, Phillips BE, Williams JW, et al. A double-blind placebo controlled trial into the impacts of HMB supplementation and exercise on free-living muscle protein synthesis, muscle mass and function, in older adults. Clin Nutr 2019;38:2071–8.
17. Asadi A, Arazi H, Suzuki K. Effects of β-Hydroxy-β-methylbutyrate-free Acid Supplementation on Strength, Power and Hormonal Adaptations Following Resistance Training. Nutrients 2017;9:1316. doi: 10.3390/nu9121316.
18. Arazi H, Hosseini Z, Asadi A, Ramirez-Campillo R, Suzuki K. β-Hydroxy-β-Methylbutyrate Free Acid Attenuates Oxidative Stress Induced by a Single Bout of Plyometric Exercise. Front Physiol 2019;10:776.