115fe21f___Pregnancy___Medicinal_Plants__5
[0] Echinacea [1] Echinacea spp. [2] Reduce duration, recurrence of colds and URI [3] Positive [4] 5-20 mL tincture [5] 
The dose listed here and considered safe by herbalists is higher than that used in the study by Gallo et al.
Pregnancy Care | Pregnancy | Medicinal Plants
5