Sure.

1. Steam Distillation: 
   - Pros: This is a well-established and generally cost-effective method that works well with a wide range of plants.
   - Cons: It requires heat, which can degrade or alter some compounds, and not all compounds are volatile enough to be extracted by steam.
   
2. Expression:
   - Pros: No heat is used, which can be beneficial for heat-sensitive compounds. It's especially effective for citrus oils.
   - Cons: It's not suitable for all types of plant materials and can result in a lower yield compared to other methods. Also, the oils can contain traces of pesticides if the peels were treated.

3. Solvent Extraction:
   - Pros: It can extract a wider range of compounds, including non-volatile compounds. It's useful for delicate, heat-sensitive materials.
   - Cons: Residues of the solvent can remain in the final product, which may not be desirable for therapeutic uses. This method is also more complex and costly.

4. Carbon Dioxide (CO2) Extraction:
   - Pros: This method can extract a wide range of compounds and doesn't involve heat, which is beneficial for preserving the quality of the oil.
   - Cons: It requires specialized, expensive equipment and is more complex. It also can't be used for all types of plant materials.

5. Cold-Pressed Extraction:
   - Pros: Like expression, this method doesn't involve heat, preserving the quality of the oil.
   - Cons: It may not extract all the available oil, resulting in a lower yield. It's also not suitable for all types of plant materials.

As for safety, solvent extraction can potentially be the least safe for consumers due to the risk of solvent residues in the final product. However, regulations typically require these residues to be at very low levels, and many companies test their oils to ensure they meet these standards. The other methods are generally considered safe, although it's always important for the oils to be used correctly and safely.
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