Rumex obtusifolius Dock,
I used broad leaf Dock but you can also use Curly Leaf Dock. Always harvest sustainably especially with roots. Never take more than you need. Never take all. Digging up Dock is very time consuming and difficult. You need to be tender to not destroy the root but firm to remove it from the rock and sandy soil in which it often grows. You can often find it growing along paths, parking lots, and roads. A strong weed with strong medicine.
Yellow Dock is called that because of the vibrant yellow of the root. The root color is so intense it can stain glass and is used as a dye. It is a wonderful astringent bitter for use in hot conditions of the stomach and intestines, especially ones cause by stagnation and fermentation in the gut. It stimulates liver and gallbladder function aiding in the release of bile easing constipation. Note, the looser the stool the lower the dose. Interestingly because it is astringent it also aids in Diarrea. It strengthens the gut by improving its muscle tone and health. Yellow dock also improves blood quality and as an alterative cleans and improves bodily fluids, and health and vitality. It is excellent for improving bodily uptake of iron and has a large amount of iron itself making it great for iron deficiency. Additionally, it can help calm liver stagnation that appears on the skin.
Yellow dock is helpful for those with weak digestion, iron deficiency, and increases mineral nutrition to the tissues. Loose bowel tone with constipation can be improved with yellow dock, especially in a decoction. It is an excellent remedy for those recovering from chronic gut stagnation and inflammation that has backed up into the liver. I think of IBD and IBS being states that may benefit from Yellow Dock, but with our modern diets we all need some gut relief.
For correction of diarrea it is good to include a mucilagenious herb to help absorption of fluids after use of an astringent. This makes Yellow Dock friends with Marshmallow Root. Burdock, dandelion, and calendula are also companions of this herb. Calendula is especially helpful for those with internal wounds like ulcers.