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Limited peptide candidates The molecular weight cutoff and stability requirements mean that only a subset of therapeutic peptides can be delivered sublingually with current technology

Refrigeration Required Other lipotropic formulationsespecially those with higher concentrations of Vitamin B12 or without preservativesrequire refrigeration to prevent degradation and bacterial contamination

While retinoids increase photosensitivity and require careful sun avoidance, GHK-Cu protects keratinocytes from lethal UV-B radiation and blocks UV-induced erythema without making skin more sensitive to sun exposure

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Butyrate promotes IL-10 secretion and reduces vascular cell adhesion molecule-1 (VCAM-1) release, which is critical for macrophage recruitment and trans-endothelial migration (63, 64)