Penis-enlargement products: Do they work? - Mayo Clinic
2020-6-3 · The length of a non-erect penis doesn't consistently predict length when the penis is erect. If your penis is about 13 cm (5 inches) or longer when erect, it's of normal size. A penis is considered abnormally small only if it measures less than 3 inches (about 7.5 centimeters) when erect, a condition called micropenis.
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