By Scott W Pierce DVM
A study was performed to evaluate the changes in serum levels of Hyaluronic acid following oral and intravenous administration in the horse. The horses were handled in a routine manner and were not on any other medications during the study.
Ten horses were chosen for the study. They were divided into three groups. Baseline blood samples were taken on each horse at the beginning of the study. One group received 100mg Hyaluronic acid daily in an oral gel preparation, the second a single intravenous dose of 40mg of Hyaluronic acid, and the third group was non-treated and served as controls. Daily blood samples were drawn from each horse for seven days. Serum samples were submitted to the laboratory where the Quantitative Hyaluronic Test Kit by Corgenix was used.
The oral HA group had the highest level of serum Hyaluronic acid. The oral group was the only group to have a substantial increase in serum HA by day seven (18% over baseline). The oral group rose from 82ng/ml to 97ng/ml. The intravenous group had a slight elevation by day 4, 78ng/ml to 80ng/ml then by day 7 the HA level decreased to below the baseline value. The control group had a constant level of 40 to 50ng/ml.
The use of oral Hyaluronic acid had a serum enhancing effect on circulating Hyaluronic acid. Circulating HA has been shown to be 10 to 100ng/ml 1 with a half-life of two days or less. 2 Therefore, daily supplementation with Hyaluronic acid is necessary to increase the serum levels of HA.
1 The Properties and Turnover of Hyaluronan: Laurent TC, Fraser JR: Ciba Found Symp 1986; 124:9-29
2 Turnover and Metabolism of Hyaluronan: Fraser JR, Laurent TC, Department of Medicine; University of Melbourne, Parkville, Victoria, Australia; Ciba Found Symp 1989; 143:41-53; discussion 53-9 281-5
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