Source: https://www.amazon.com/Stinging-Nettle-Leaf-Sifted-Organic/dp/B00016XK2S/ref=as_li_ss_tl?ie=UTF8&qid=1485883560&sr=8-4&keywords=nettle&linkCode=ll1&tag=wellnessmama-20&linkId=5b530049d6d40af0ab89878216874cc8