| Vegan? Maybe | Vegetarian? Maybe |
Classifications are made based on the available commercial supply of the ingredient, and are made based on the criteria on our classifications page.
Commercially available guanine may be vegan depending on the source and may be vegetarian depending on the source.
Guanine is one of the four nucleotide bases used in DNA. It is used as a colorant in cosmetic products. It is usually produced synthetically, but can also be extracted from fish scales.