Basics & Technique
Shake or swirl?
Updated 2026-05-02
Always swirl. Never shake. Shaking throws the peptide around hard enough to snap its delicate structure, which makes your solution cloudy and can ruin the dose. Swirling rolls the water gently around the vial so the powder dissolves without stress. The same rule applies to every protein drug in pharmacy. Pro tip: aim the water down the inside glass wall of the vial instead of straight onto the powder.
IfIf powder won't dissolve
Thenthen rest the vial in the fridge for 10 to 15 minutes and swirl again
IfIf it gets cloudy after shaking
Thenthen let it sit at room temp and watch - if it doesn't clear, discard it
IfIf you received a cloudy vial from a supplier that was clearly shaken in transit
Thenthen contact them before using
Key facts
- Mechanical shear from shaking can fragment or denature peptide chains
- Vigorous agitation at the air-liquid interface causes irreversible protein aggregation
- High-molecular-weight and aggregation-prone peptides are especially sensitive
- Down-the-wall mixing is standard pharmaceutical biologics handling
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