Which one do I need?
Tap what you are doing and the list appears: what you need, what is worth adding, what you can skip, with one line on why. One or two optional questions fine-tune it. Every pick is worked out from the products' recorded specifications.
What this does: matches supplies to your situation by their specifications. What it does not do: tell you what to inject or how much; it never asks. If you already know the exact product type you want, the Product Finder goes straight to specifications, and the tools and calculators handle the arithmetic once you have bought. Every situation below also has a printable checklist.
The same lists, written out
Printable, linkable versions of each situation, made from the same product records.
What the six situations cover
The interactive list above is built from these situations. Each one has a printable checklist made from the same product records, and draws only on the categories named here.
Inject
Syringes, skin prep, pressure afterwards, and where the needle goes. The subcutaneous routine: a fine syringe, a clean site, pressure afterwards, somewhere legal for the needle.
Optional questions: How much liquid do you draw each time?; Any trouble reading the lines on a syringe?. Categories used: Syringes & Needles, Sterile Prep, Comfort & Safety, Measuring & Tracking. Printable checklist.
Mix a vial
Turning powder into liquid: the right water and the tools to move it. Turning a freeze-dried powder into a liquid you can draw: the right water, something to move it with, something to write on.
Optional questions: Will you draw from the vial more than once?; Needles for moving the water, or none?. Categories used: Mixing & Water, Syringes & Needles, Sterile Prep, Measuring & Tracking. Printable checklist.
Use a pen
Pen needles and the short list around them. A pen does its own measuring, so the list is short.
Optional questions: Does the pen travel with you?. Categories used: Syringes & Needles, Sterile Prep, Travel. Printable checklist.
Store vials cold
Keeping vials at fridge temperature at home, and proving it. 2–8 °C (36–46 °F), dark, and proof that it stayed there.
Optional questions: Where will they live?; How do you want to check the temperature?. Categories used: Storage & Cold, Travel, Measuring & Tracking. Printable checklist.
Travel with vials
Keeping vials cold and legal on the way, by car or by plane. Keep it cold, keep it legal, keep it findable.
Optional questions: How are you travelling?; How long between fridges?. Categories used: Travel, Storage & Cold, Measuring & Tracking. Printable checklist.
Dispose of needles
The container that a pharmacy or council will actually take. Where it goes depends on where you live; what it goes in does not.
Optional questions: How many needles a month?; Is there a drop-off near you?. Categories used: Sterile Prep. Printable checklist.
How the picks are made
Every product in the catalogue carries recorded specifications (gauge, barrel size, cap size, cooling method, hours cold, and so on). A situation asks for a set of those specifications per slot; the products that meet them are ranked by the site's own pick, then by price tier. Nearly every line is chosen from those records; the two lines (cold pack, numbing cream) are picked by hand, because no specification decides them. Nothing here is advice about what to inject or how much. For the reasoning behind each category, see the guides, the glossary, and the side-by-side comparisons.