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Most human growth hormone (HGH) is sold as a lyophilized (freeze-dried) powder that must be mixed with a diluent before injection
. However, it does not typically contain additional preservatives and must be mixed with bacteriostatic water for storage after mixing.

Why preservatives are typically added to HGH
Refrigeration is required for HGH after it is mixed because the active ingredient, somatropin, is a fragile protein that can degrade over time. Preservatives are added to certain HGH formulations to extend their shelf life in liquid form by inhibiting microbial growth.

ZPHC HGH and reconstitution
Powder form: Before mixing, lyophilized ZPHC HGH is more stable and does not need refrigeration.Reconstitution: To be used for injections, the powder must be reconstituted (mixed) with a liquid diluentPlain sterile water: If mixed with plain sterile water, the HGH should be used immediately and any unused portion should be discarded. This is because sterile water lacks a preservative.Bacteriostatic water: To extend the shelf life for multiple doses, you must use bacteriostatic water, which contains a preservative like benzyl alcohol or metacresolRefrigeration: Even when reconstituted with bacteriostatic water, the HGH must be refrigerated to maintain its potency. The shelf life is typically limited to a few weeks, after which the HGH degrades and should be discarded.
HGH in pen form much like insulin pens will last very long time. After first use. ( just be sure to change the pin needle). To avoid degrading, from airborne and unsterile surface debris.