What historical concern related to alfalfa's biological effects prompts reservation about concentrated use during gestation?
Answer
The potential for it to stimulate the uterus.
Beyond the modern concerns regarding bacterial risk and L-canavanine exposure, there is a historical consideration regarding alfalfa's potential physiological effects. Specifically, there is concern that alfalfa might possess properties that stimulate uterine activity. Since stimulating the uterus is generally something advised against during pregnancy to maintain stability, this potential effect adds another substantial layer of caution against using high-dose or concentrated alfalfa supplements without strict medical oversight.

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