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I still get the occasional numbness with stinging and burning in my legs

And thats when the question hits

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(4) Fangru Jiang, Yanan Wu, Zhe Liu, et al (2023) Synergy of GHK-Cu and hyaluronic acid on collagen IV upregulation via fibroblast and ex-vivo skin tests Journal of Cosmetic Dermatology, 2023 Sep, Volume 22 (Issue 9), Pages 2598-2604