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September 2020 in “International Journal of Nanomedicine” Both human and animal-derived small extracellular vesicles speed up skin healing equally well.
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June 2022 in “Pharmaceutics” Goat placenta in microneedle patches is effective and safe for skin regeneration.
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June 2001 in “PubMed” Pig ear skin is similar to human skin, making it useful for research, but it has some differences.
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October 2020 in “European journal of pharmaceutics and biopharmaceutics” Caffeine penetrates skin quickly through open hair follicles, but less through closed ones, with levels becoming equal after 22 hours.