Peptides come in a lyophilized form. This process of lyophilization, also known as freeze-drying, is a process that results in preserving biological material, by removing water from the specific material. In order to achieve this, the sample needs to be frozen and dried under a vacuum, at extremely low temperatures. Lyophilized peptides have a much longer shelf-life than samples that are not treated.As part of the process of using lyophilized peptides, the powder needs to be reconstituted in a solution. This solution may differ between vendors, or differ between different compounds. Usually BAC- or sterile water is used to reconstitute the powder into an injectable soluble.  See our article on the differences between BAC- and sterile water – click here.When a peptide powder is reconstituted, it needs to be stored in a cold space away from direct sunlight. A fridge is advised, as the cold prolongs shelf-life and the enclosed space protects the solution against sunlight. Reconstituted solutions that are left outside or left in sunlight will deteriorate quickly.

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