1. Easy availability
2. Economical
3. Fewer side effects as compared to synthetic drugs
4. Simple method of preparation
5. Provide precursor for the synthesis of many compounds

Disadvantages

1. Most of the herbal products enter the market without being tested for their safety and efficacy.
2. Standardization is required because of inconsistency in their active constituents.
3. Yield of active constituents is not constant and it varies with season.
4. Estimation of a particular constituent is difficult and sometimes tracing the active constituent is difficult.
5. Presence of other constituents in herbal formula affects therapeutic response in many ways.
6. Standardization and estimation of active constituents require modern methods.
7. Certain herbal formulations and extracts are difficult to process as they have low practical yield.
8. Herbal drug interactions are difficult to predict.
9. As compared to synthetic drugs, herbal formulations are not available in all dosage forms.