Chickweed Contraindications?

Would someone with a heart stent, thyroid disease and diabetes be safe in taking chickweed, in your opinion?
I am taking it for the curbing of the appetite. But I know someone who wants to try it but has the above conditions.

The actions of chickweed, used internally, are: soothing, cooling, anti-rheumatic and mildly laxative. I don't know of any reason why it would negatively affect the thyroid, heart and blood circulation or diabetes.