European research with twenty patients demonstrated substantial dermal high quality improvement and atrophic acne scar reduction from PN injections, confirming its basic safety and efficiency as just one treatment method. Nevertheless, this requires larger sized, for a longer time-term randomized studies for more conclusive evidence. 已知對膠原蛋白過敏患，包括（但不限於）曾使用膠原蛋... https://laetigen19741.eedblog.com/35392142/little-known-facts-about-膠原蛋白