Supplies
Everything you need to mix a vial and measure doses, with what to look for when you buy.
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What everyone needs
For mixing a vial and getting rid of used needles safely, however you measure doses.
Bacteriostatic water
Mixes the powder. It’s sterile water with a preservative. If your product came with its own liquid, or its profile lists a different one, use that instead.
Look for
- Labeled bacteriostatic water
- Sealed and in date
Alcohol prep pads
Wipe the rubber top of the vial or cartridge before every needle goes in, then let it dry.
Look for
- Sterile
- Individually wrapped
Sharps container
Every used needle and syringe goes straight in. When it’s about ¾ full, get rid of it the way your area’s rules say.
How to get rid of it (FDA) (opens in a new tab)Look for
- FDA-cleared
- Tight, puncture-resistant lid
Then pick how you’ll measure doses
Pick one. The dose calculator works with either.
With insulin syringes
Draw each dose straight from the vial. The fewest things to buy.
U-100 insulin syringes
A new one for every dose. Get the smallest size that fits your dose; a 1 mL syringe also adds the water when you mix.
Which size fits your doseLook for
- U-100 scale
- 0.3, 0.5 or 1 mL
- Sterile, single-use, needle attached
V2 pen
Holds a 3 mL cartridge. On documented V2 models 1 click = 1 unit = 0.01 mL, up to 60 units a dose; confirm it in your pen’s instructions.
Look for
- V2 with a 60-unit dial
- Fits standard 3 mL cartridges
Suggested on Amazon
Qouinuey V2 pen, 60-unit
Comes with a case. Pen only: cartridges and needles are sold separately.
Empty 3 mL cartridges
The mixed liquid goes into a cartridge, and the cartridge goes into the pen.
Look for
- Sterile and sealed one by one
- 3 mL, made for V2 pens
Suggested on Amazon
Mematflo 3 mL glass cartridges, 30 pack
Steam-sterilized and individually sealed. Listed for V1 and V2 pens.
Pen needles
Screw onto the pen. Put on a new one for every injection.
Look for
- Sterile, single-use
- Screw-on, for pen injectors
Suggested on Amazon
CareLiving pen needles, 32G 4 mm, 100 count
Sterile. The listing says they fit most pen injectors.
3 mL syringes
For adding the water to the vial and moving the mixed liquid into a cartridge. A new one each time.
Look for
- Sterile, single-use, needle attached
- Medical use, not “lab use only”
Safety basics
From the FDA’s advice for pens, needles and syringes.
A new needle every time
Put a new needle on the pen, or use a new syringe, for every injection.
Never share
Not pens, cartridges, needles or syringes, even after changing the needle.
Straight into the sharps container
Right after each use. Keep the container away from children and pets.
Check the dates
Don’t use needles or syringes past the expiry date on the box.
Sources: FDA insulin safety tips (opens in a new tab), sharps disposal guide (opens in a new tab) and the pen-sharing warning on FDA drug labels (example: Ozempic label, section 5.4 (opens in a new tab)).
About these links
- No affiliate links. Each link goes straight to the product’s page on Amazon. PepSavvy earns nothing if you buy, and no seller paid to be listed.
- Examples, not endorsements. We haven’t tested these products. Their listings matched the “look for” points when we checked them on October 14, 2026, and you can judge any other brand by the same points.
- Check before you buy. Sellers can change a listing at any time. Prices change too, so we don’t show them.
- Equipment only. This page doesn’t cover where to get peptides, and it isn’t advice to use any compound or dose.