Physical effort produces peripherical and central tiredness. A supplement with L-tryptophan provides an optimal serotonin concentration, which modulates tiredness and pain sensation at central level.Therefore, physical potential improves in a natural way.

• Tiredness can be caused by energy components irregularities in the plasma or can have a neuromuscular origin
• Physical exercise produces metabolic changes at muscular and central nervous system level. These metabolic changes lead to muscular performance decrease
• The positive tryptophan effect on tiredness could be explained by the brain’s neurotransmitter serotonin capacity to modulate and reduce nociceptive impulses resulting from muscles, tendons and ligaments tension during exercise. A reduction of tiredness’ perception indirectly increases sport performance and wellness feeling.