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Description
Theranostics 2022;12:52375257

Many people use it without apparent issues

If this happens consistently, switch to a 45-degree angle, use a shorter needle, and always pinch the skin when injecting in the thigh

Having a long needle isn't necessary

10.1186/s40360-021-00525-7 12 BaileyD

A 2024 clinical study on PDRN efficacy (PubMed: 38842633) confirmed that weekly application for 12 weeks produced statistically significant improvements in hair density
