Usage History of 'retinols'

The following chart shows how frequently 'retinols' appeared in printed materials over time. For example, the word 'retinols' occurred 2 times in books in 1963 and 84 times in 2008. From 1963 to 2008, the word 'retinols' was used a total of 1,757 times in books scanned by Google. See Reference: Google Ngram project.

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