In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: In addition , it is important to report adverse effects associated with frequently consumed supplements and herbal products to the Food and Drug Administration and in the literature .
### Output Text:
In addition , it is important to report adverse effects associated with frequently consumed supplements and herbal products to the Food and Drug Administration and in the literature . 