Penis erection length is only 12CM, is it normal?

Patient's question:

Patient Gender: Male
Detailed Condition and Purpose of Consultation: To understand the following

Doctor's answer:

Generally, an erect penis longer than 10 cm is considered normal, and there is no such thing as being too small. Consuming beef, lamb, dog meat, and soy products may promote the development of the penis and secondary sexual characteristics. Choose one of the following options: dry roast the testicles and placenta of pigs, sheep, or dogs, grind them into powder, and take 2 grams each time, twice a day. Long-term use has a similar effect.
Every night before bed, gently massage the penis with the fingertips, or lightly tap the penis with the index finger for 15 minutes. Alternatively, wrap the penis tightly with a warm, damp towel and rub it vigorously with both hands for 15 minutes each night. These are common self-healing methods. If you feel your penis is too small, you might want to try them.