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Key characteristics: 24-month shelf life from manufacture when refrigerated 21 days at room temperature (below 86 degrees Fahrenheit) No preservatives in the prefilled pens Single-use pens designed for one injection Extensive stability testing and quality control Consistent potency from batch to batch The single-use pen design eliminates one major variable: you never need to worry about how long an opened vial lasts because each pen is used once and discarded

This is what causes the yellow or brassy appearance many people notice over time

Generally, these injections are considered safe

Advanced therapies should be chosen thoughtfully, ideally with clinician guidance, especially when they require higher investment