Where is the best dendrobium origin

At present, Dendrobium is mainly cultivated, mainly produced in Zhejiang, Yunnan, Guangxi, Anhui, Hunan and other places; the above places of Dendrobium can be effective, there is no best saying.
Dendrobium is beneficial to the stomach and generates fluids (by replenishing fluids in the stomach to nourish the stomach), nourishes yin and clears heat (nourishes yin essence and removes heat). The main treatment for heat disease and fluid injury, dry mouth and thirst, lack of stomach yin (lack of yin fluid in the stomach), less food and dry vomiting, not subsiding after illness, deficiency of yin and fire (deficiency of yin essence in the body, the appearance of hyperactive deficiency and fire), bone vapor and labor heat, darkness of the eyes, impotence of sinew and bone weakness.
The adverse reactions and contraindications of Dendrobium ironpierre are not clear, during the period of taking it, the diet should be light, avoid smoking, alcohol and spicy, cold, greasy food.
If the patient has any discomfort, please go to the regular medical institutions; if you need to use Dendrobium, must be under the guidance of a professional doctor to use medication.