Peptides are supplied as lyophilised (freeze-dried) powders. The appearance can vary between batches and products. You may see:
A fine loose powder
Small clumps
A compact powder "puck" at the bottom of the vial
A slightly hardened or solid-looking powder
Small fragments stuck to the sides of the vial
All of these are normal for lyophilised material and don't indicate a product issue. The freeze-drying process and the conditions during shipping (vibration, temperature changes) can both affect how the powder settles inside the vial.
Is the vacuum seal supposed to make a sound?
Some vials have a vacuum seal that makes a soft hiss when opened, others don't. Either is normal — vacuum seal isn't a quality indicator.
Concerned about the appearance?
If something looks unusual, email [email protected] with:
Your order number
A clear photo of the vial
Our team will review and let you know whether anything needs to be done. We typically respond within 1 business day.