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EC50 (Effective Concentration)

Written by the Fiveable Content Team โ€ข Last updated August 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated August 2025

Definition

The EC50, or Effective Concentration 50, is the concentration of a substance at which 50% of a specific biological response or effect is achieved. It helps determine the potency of a substance.

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