Usage History of 'retinol'

The following chart shows how frequently 'retinol' appeared in printed materials over time. For example, the word 'retinol' occurred 4 times in books in 1842 and 10,757 times in 2008. From 1842 to 2008, the word 'retinol' was used a total of 298,354 times in books scanned by Google. See Reference: Google Ngram project.

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