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2. The 13 Best Gentle Retinols for Sensitive Skin

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   All it takes is a little bit of research and some skincare know-how, which is exactly why we're sharing the best retinols for sensitive skin here.

3. Vitamin A - Wikipedia

   en.wikipedia.org/wiki/Vitamin_A

   A plasma concentration of about 2.0 μmol/L is normal; less than 0.70 μmol/L (equivalent to 20 μg/dL) indicates moderate vitamin A deficiency, and less than 0.35 μmol/L (10 μg/dL) indicates severe vitamin A deficiency. Breast milk retinol of less than 8 μg/gram milk fat is considered insufficient. [6]

4. How Often Should You Use Retinol? Here's What Dermatologists Say

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5. What's the Difference Between Retinol and Retinoids?

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   We're the first to admit the difference between retinol, retinoids, and retinal can be confusing. That's why we tapped dermatologists Dr. Whitney Bowe and Dr. Michelle Henry to explain. Plus, they ...

6. Retinol - Wikipedia

   en.wikipedia.org/wiki/Retinol

   Retinol, also called vitamin A 1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [3] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes , immune function and reproductive development. [ 3 ]

7. Hypervitaminosis A - Wikipedia

   en.wikipedia.org/wiki/Hypervitaminosis_A

   Retinyl esters can be distinguished from retinol in serum and other tissues and quantified with the use of methods such as high-performance liquid chromatography. [ 21 ] Elevated amounts of retinyl ester (i.e., >10% of total circulating vitamin A) in the fasting state have been used as markers for chronic hypervitaminosis A in humans and ...

8. The 8 Best Vitamin A Serums That Smooth and Even Skin ... - AOL

   www.aol.com/8-best-vitamin-serums-smooth...

   Rapid Wrinkle Repair Retinol Serum. With this retinol serum, a little goes a long way. You only need a pea-sized amount for your face and neck, and the silky texture sinks into the skin instantly.

9. Retinoid - Wikipedia

   en.wikipedia.org/wiki/Retinoid

   First generation retinoids are produced naturally in the body and interact with their normal biological counterparts, such as retinol binding protein 4 for retinol, retinoid receptors for all-trans-retinoic acid or 9-cis-retinoic acid. [9] 13-cis retinoic acid has an unknown biological pathway but appears to act as a growth factor. [10]