Is l-isoleucine vegan?
L-isoleucine may not be vegan since it can be derived from duck feathers.
A vegan dietitian reviewed this note on l-isoleucine for Fig. Check if other ingredients are vegan with the free Fig app!
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Learn how to think about ingredients like l-isoleucine
There are more than 500 ingredients to avoid on a vegan diet. Some ingredients like beef and pork are clearly not vegan; however, others are not as obvious. This is especially true of additives or vague ingredients like "natural flavors."
When in doubt, look for certified vegan labels on products. You can also contact food manufacturers directly to ask if specific products are vegan.
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