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While there are no recommended daily allowances for lecithin, some researchers have suggested a daily supplement of 550 mg for men and 425 mg for women. Most people receive an adequate amount of lecithin through their diet.
The lecithinâsphingomyelin ratio (aka L-S or L/S ratio) is a test of fetal amniotic fluid to assess for fetal lung immaturity. Lungs require surfactant, a soap-like substance, to lower the surface pressure of the alveoli in the lungs.n LâS ratio of 2 or more indicates fetal lung maturity and a relatively low risk of infant respiratory distress syndrome, and an L/S ratio of less than 1.5 is associated with a high risk of infant respiratory distress syndrome.