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Vitamin A 0.05% gel

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I am trying to find out which chemical form of vitamin A is used in pharmaceutical gels.

- Vitamin A 0.05% gel for pharmaceutical

1) vitamin A
2) vitamin A Aldehyde
3) 9-cis-Retinoic Acid
4) 13-cis-Retinoic Acid

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https://brainmass.com/biology/biological-chemistry/vitamin-gel-chemicals-38813

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Vitamin A creams and gels are used to treat acne and wrinkles. There are several brand names and patented chemical names which are varieties of vitamin A developed by different companies. One of the most widely ...

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The solution explains Vitamin A and provides the answer in a short paragraph.

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