[Research] The melanin-dispersing part of licorice root is liquiritin. 4% Liquiritin is an effective dose - far better than hydroquinone. What % of licorice root is liquiritin? (I make some guesses)

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The closest answer I've been able to find is that a different compound, glabridin, is the most prevalent and makes up 10 - 25% of licorice root extract.So liquiritin is lower than that. Let's be generous and say it's 10%. To get a topical product with the ideal dose of liquiritin, it would need to be 40% licorice root extract. Quite possibly a lot more.So does anyone know: if there are products with pure liquiritin, or, products with an extremely high % of licorice root?Here's the study for the 4% - "Comparison of efficacy of topical 2% liquiritin, topical 4% liquiritin and topical 4% hydroquinone in the management of melasma""Conclusion Topical 4 % liquiritin is significantly more effective than topical 2% liquiritin and topical 2% liquiritin is also significantly more effective than 4% hydroquinone."http://www.jpad.org.pk/july%20sep%202009/7.original%20article%20topical%20liquirtin%20vs.%20hydroquinone%20in%20m_205.pdf
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