How much peptide is left behind by each pen version.

[damic]

love the data!

[Nuncles]

That's very helpful.

But if pens are inaccurate when it comes down the last bit, who should let their cartridge go that low? As Randy has stated. The last 10 or so unita are inaccurate. I tested a pen that is not supposed to let you dial more than what's left in the cartridge. I consistently got 15 to 20 units less than what the pen dial indicates, on that final dose.

[ogsteve]

@Randy said:

Here's a quick comparison of what's left behind in a cart after each pen version has pushed to its limit.

If you really need to get every last drop out, just use a syringe to pull out the remaining; never use a spacer.

Why no spacer?

[Nuncles]

According to Jeff, it can make the doses inaccurate.

[Randy]

@ogsteve make dosing inaccurate and will break your pens, if you really need the last 5 units use a syringe to get it out.

[ogsteve]

@Randy I just bought some replacement pusher feet off Etsy. They just replace the factory ones. Would these have the same issue?

[AngieC]

@ogsteve Ooo, curious about this. Did you have to break the sterility of the vial to put in the new 'pusher foot'?

[Randy]

@ogsteve you mean a spacer? yeah you are going to break your pen.

[ogsteve]

@AngieC it looks like they replace the pusher foot on the pen itself. Has nothing at all to do with the cartridge.

[Randy]

@ogsteve replace the pusher foot with a longer one or add a spacer. Same same.

[Stevepep]

Do not use a spacer; it will most certainly break the pen. Been there, done that. Listen to @randy. They get stuck in that position and even if you manage to get the plunger back down, it will never be accurate again.