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Anyway, the fact is that some people manage perfectly well on a 1mg injection every three months but others, and the vast majority of the PA Society do not, and they feel a return of their symptoms, or their family and friends notice a return of their symptoms long before their next injection is due
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They also offer more controllable results, making them more ideal for precise enhancements like the lips, and PRF more suitable for broader areas, such as tear troughs
By a single added tyrosine at the amino terminus, introduced to improve stability and handling rather than to change activity
The combination of chemical degradation and bacterial growth makes the risk outweigh the cost of a replacement vial