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Sequential changes in WOMAC A (pain) scores expressed as a percentage of baseline values. Placebo (blue, n = 22), high dose sierrasil (green, n = 20), low dose sierrasil (red, n = 21) and low dose sierrasil + cat's claw extract (orange, n = 25) all demonstrated a time dependent improvement in the pain indices of WOMAC A. However, in the placebo group this was delayed until the last month of the study. All sierrasil treated groups displayed a faster onset of action.
