Peptide pen tips 31G 8mm are very small, thin needles made to fit on pen-style shot devices used in research labs. They are sold sterile, in lab-grade quality, and work with 3mL cartridges on the PSPen and similar pen devices. They are used by trained researchers and licensed laboratories, not by people at home.
The needle part that goes into the skin is very thin, so it usually causes less pain than thicker needles. Studies on insulin shots, which work much the same way, show these thin needles deliver the same amount of liquid as thicker ones while hurting less. The short 8mm length is made just right: it reaches the fatty layer under the skin without going too deep into muscle.
Not everything is known. These tips are sold only for lab research, not for use on people or animals, and they have not been checked or approved by the FDA. Labs should ask for a Certificate of Analysis to confirm quality. Anyone handling them should use sterile methods and follow all safety rules.
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