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Comparison of availability and plasma clearance rates of β-hydroxy-β-methylbutyrate delivery in the free acid and calcium salt forms

  • John C. Fuller (a1), Rick L. Sharp (a2), Hector F. Angus (a2), Paul Y. Khoo (a2) and John A. Rathmacher (a1) (a3)...

Abstract

β-Hydroxy-β-methylbutyrate (HMB), a leucine metabolite, has long been supplemented as a Ca salt (Ca-HMB) to increase strength and performance gains with exercise and to reduce recovery time. Recently, the free acid form of HMB (HMB-FA) has become commercially available in capsule form (gelcap). The current study was conducted to compare the bioavailability of HMB using the two commercially available capsule forms of HMB-FA and Ca-HMB. We also compared the pharmacokinetics of each form when administered mixed in water. Ten human subjects (five male and five female) were studied in a randomised crossover design. There was no significant sex by treatment interaction for any of the pharmacokinetic parameters measured. HMB-FA administered in capsules was more efficient than Ca-HMB capsule at HMB delivery with a 37 % increase in plasma clearance rate (74·8 (sem 4·0) v. 54·5 (sem 3·2) ml/min, P<0·0001) and a 76 % increase in peak plasma HMB concentration (270·2 (sem 17·8) v. 153·9 (sem 17·9) μmol/l, P<0·006), which was reached in one-third the time (P<0·009). When HMB-FA and Ca-HMB were administered in water, the differences still favoured HMB-FA, albeit to a lesser degree. Plasma HMB with HMB-FA administered in water was greater during the early phase of absorption (up to 45 min postadministration, P<0·05); this resulted in increased AUC during the first 60 min after administration, when compared with Ca-HMB mixed in water (P<0·03). In conclusion, HMB-FA in capsule form improves clearance rate and availability of HMB compared with Ca-HMB in capsule form.

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Corresponding author

* Corresponding author: Dr J. A. Rathmacher, fax +1 515 296 0908, email rathmacher@mti-hmb.com

References

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