Abstract
The anti-fatigue effect of phosphoserine, L-serine and a mixture of sodium phosphate and L-serine was studied in rats. Phosphoserine orally administered induced a statistically significant anti-fatigue effect in rats of both sexes submitted to a training test by rotarod, with 14 sessions in 3 days. Phosphoserine was utilized better than the mixture of sodium phosphate and L-serine, where L-serine alone induced no effect. Therefore, the effect of phosphoserine seems to be due to the phosphoryl bond.