An observational study of 31 pregnant women demonstrated that an herbal yeast product is able to keep the haemoglobin levels of expectant mothers stable without additional vitamin or iron preparations having to be taken. The product improved the general wellbeing and vitality of the women. Herbal yeast also helps improve the uptake of iron from the diet (catalyst function).
Leffler L., Leffler T., Joller P., Haemoglobin levels during pregnancy, observational study on the effect of Bio-Strath® Food Supplement on the haemoglobin levels of pregnant women, Schweizerische Zschr. GanzheitsMedizin 2000; 12 (6): 327–328