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Background: The aim of this study was to verify the effects of protracted intake of chlorophyll on blood counts’ parameters and iron levels in endurance athletes, investigating supposed anti-anemic properties.Methods: Twenty-two endurance athletes were randomly assigned into two groups in a double-blind study: the experimental group (EG) consumed chlorophyll, while the control group (CG) consumed a placebo, at a dose of 1.6 drops × kg per day for 120 days. Blood cell count and the serum iron analyses were carried out before starting the experiment, after 30 days and after 120 days.Results: EG showed statistically significant increase in platelet distribution width (PDW, MD = 0.83, 95% CI 0.41, 1.38), mean platelet volume (MPV, MD = 0.41, 95% CI 0.19, 0.67) and platelet/large cell ratio (P-LCR, MD = 3.28, 95% CI 1.51, 5.25) after 120 days. No variations in CG were found during the follow-up.Conclusions: The increase of platelet-related measures could positively influence the endurance performance by reducing pain and fatigue. The supposed ergogenic effects and anti-anemic properties however require further study. [ABSTRACT FROM AUTHOR]