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Glossary Retina

The retina is a thin layer of tissue located at the back of the eye that contains light-sensitive cells, which convert light into neural signals for visual processing. While it is primarily associated with vision, the retina's health can indirectly relate to hair loss, as certain systemic conditions affecting the retina, such as diabetes or hypertension, may also influence hair follicle health and hair growth. Key distinguishing characteristics of the retina include its composition of photoreceptor cells (rods and cones) and its role in processing visual information, which is essential for overall sensory perception.

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How does retinol improve scalp health and prepare the skin for other hair growth treatments? Retinol improves scalp health by promoting cellular turnover and reducing congestion.
Can retinol help enhance the absorption of ingredients like minoxidil or peptides? Retinol may enhance absorption of minoxidil and peptides by modifying skin barrier properties.
Is retinol safe to use on the scalp, or should it be diluted to avoid irritation? Retinol can be used on the scalp but should be diluted to minimize irritation.
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Research

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research The triacylglycerol synthesis enzyme DGAT1 also catalyzes the synthesis of diacylglycerols, waxes, and retinyl esters

258 citations , July 2005 in “Journal of lipid research”

This study found that DGAT1 exhibits additional acyltransferase activities in vitro, including MGAT, wax synthase, and ARAT activities, suggesting these could be relevant to its in vivo functions.

research Retinol Esterification by DGAT1 Is Essential for Retinoid Homeostasis in Murine Skin

91 citations , November 2008 in “Journal of biological chemistry/The Journal of biological chemistry”

This study found that DGAT1 functions as a key enzyme in murine skin to regulate retinoic acid levels and prevent retinoid toxicity, impacting hair cycle and sensitivity to retinol.

research The Additive Effects of Minoxidil and Retinol on Human Hair Growth in Vitro

32 citations , January 2007 in “Biological & Pharmaceutical Bulletin”

This study found that combining minoxidil and retinol additively promoted hair growth in vitro, enhancing Erk- and Akt-dependent pathways and preventing apoptosis in dermal papilla cells and keratinocytes.

research Mice lacking the epidermal retinol dehydrogenases SDR16C5 and SDR16C6 display accelerated hair growth and enlarged meibomian glands

16 citations , September 2019 in “Journal of biological chemistry/The Journal of biological chemistry”

This study found that the retinol dehydrogenases SDR16C5 and SDR16C6 in mice play a crucial role in skin retinol dehydrogenase activity, affecting hair growth and gland functions without impacting survival.

research Increasing the percutaneous absorption and follicular penetration of retinal by topical application of proretinal nanoparticles

14 citations , March 2019 in “European journal of pharmaceutics and biopharmaceutics”

This study observed that proretinal nanoparticles delivered significantly higher concentrations of retinal to the stratum corneum and hair follicles compared to non-particulate forms, potentially improving topical retinoid therapy.

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