Which supplement can lead to a decline in performance and may be ineffective in raising hemoglobin concentrations? a. creatine b. coenzyme q10 c. iron d. pyruvate

Iron is the supplement that can lead to a decline in performance and may be ineffective in raising hemoglobin concentrations. Correct C

Iron is a mineral that's vital to the human health and it is needed for transporting oxygen and carbon dioxide.

steady state because it the only on that maes sense