Can Dendrobium (Shihu) be steeped in water and consumed for a long period?
Generally speaking, Dendrobium (Shihu) is not recommended for long-term daily consumption as a herbal tea. The detailed explanation is as follows:

Dendrobium is a traditional Chinese medicinal herb known for nourishing yin, clearing heat, benefiting the stomach, and promoting the production of body fluids. Drinking Dendrobium-infused water in moderation may offer various health benefits, such as enhancing immunity, improving digestion, protecting the liver, and providing antioxidant effects. However, due to its slightly cold nature, long-term or excessive consumption may lead to adverse effects.
The cold nature of Dendrobium may harm the spleen and stomach, potentially causing symptoms such as abdominal pain, diarrhea, and loss of appetite. Prolonged excessive consumption might interfere with the normal circulation of qi and blood, leading to stagnation and possibly triggering various illnesses. Some individuals may experience allergic reactions to certain components in Dendrobium, manifesting as rashes, itching, or swelling.
Dendrobium contains various active compounds that may interact with certain medications, affecting their efficacy. It also has a blood sugar-lowering effect; diabetic patients who do not monitor their blood glucose levels may risk hypoglycemia if they consume Dendrobium tea indiscriminately. Pregnant women, nursing mothers, children, and individuals with a cold body constitution should consult a qualified physician before consuming Dendrobium tea to ensure safety. For those who do consume Dendrobium tea, it is recommended to do so in moderation and in combination with other Chinese herbs to enhance therapeutic effects and minimize side effects.