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Research Limitations and Gaps While the individual peptides have encouraging results in animal or cellular models, several limitations remain: Lack of clinical trial data on combinations or long-term effects Unknown interaction dynamics between multiple peptides in vivo Variability in peptide purity and stability among sources Dosing and timing considerations remain undefined in a blended context Limited human translational data beyond small pilot or observational studies Further research is needed to determine how such peptides behave together , including any potential synergistic , neutral , or even antagonistic interactions
For patients with more advanced facial ageing, significant jowls and loose skin of the neck, a deep plane facelift remains the gold standard
Inge TH, Courcoulas AP, Jenkins TM, et al
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