Allantoin chemical formula. Allantoin structural chemical formula isolated on transparent background. stock illustration...

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What's a royalty-free license?

Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that content. It's a win-win, and it's why everything on iStock is only available royalty-free — including all Acid images and footage.

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Learn more about royalty-free images or view FAQs related to stock illustrations and vectors.