CommunityInjection Technique

Endotoxins (would you inject and if so any modifications)

18 replies8 peopleJan 9, 2026☆ Follow
Summary

Is 19 EU endotoxins per 17 mg tirzepatide injection safe given FDA limits and what modifications reduce risk

Participants calculate roughly 1.13 EU per mg and 19 EU per 17 mg dose, well below the 5 EU per kg per hour threshold for a 110 kg person. Most conclude the level is tolerable for occasional use and suggest starting with smaller doses, alternating vials, splitting injections across hours, or filtering to dilute exposure. A few note that real-world reactions can occur below official limits and that intra-batch variability remains unknown.

What this discussion establishesStill open

Whether intra-batch endotoxin variability is high enough to make single-vial testing unreliable

Nothing here is advice.

18 replies · 8 people
WarmMeadow92archiveopening postJan 9

I'm in an independent test group and one vial from a recent batch came back with around 78 units of endotoxins. That's higher than earlier tests and seems to be climbing. The vial tested at about 69 milligrams of the peptide so roughly 1.13 units per milligram. At a 17 milligram dose that works out to about 19 units per injection. The limit is 5 units per kilogram of body weight per hour so at 110 kilograms the body could handle 550 units hourly. Nineteen units looks tolerable though higher than I'd prefer. I may start with smaller doses from this batch mixed with another supply to reach the full amount and switch batches before finishing it.

ClearHarbour45archiveJan 9
↳ replying to @WarmMeadow92 (opening post)

I ran the same numbers and got the same result. I'd try one shot and see what happens. The per-hour part confuses me though does that mean the amount stays in your blood every hour or just how much you take in each hour. There's information out there on endotoxins but I can't find it right now.

WarmMeadow92archiveJan 9
↳ replying to @ClearHarbour45

My reading so far indicates the five-unit limit is per hour per kilogram because endotoxins clear fairly fast mainly through the liver. The bigger worry is the sudden spike from one injection and the immune response it triggers. The official limit is just an upper bound and clinicians might consider lower amounts safer in practice. Some people could react at far fewer units than the guidance allows.

SharpCinder28archiveJan 9

I stumbled upon these careful views shared by another person about endotoxin test outcomes.

SharpCinder28archiveJan 9
↳ replying to @WarmMeadow92

I checked with an AI since the guidance keeps shifting and it looks acceptable for occasional use. A different option might be easier on the liver though.

SteadyTimber49archiveJan 9

I might go for it since I can handle quite a bit of uncertainty. Switching between milder groups sounds good to me.

WarmMeadow92archiveJan 9
↳ replying to @SteadyTimber49

What if I mixed one vial of the higher-endotoxin batch with two milliliters of bacteriostatic water and another cleaner vial with two milliliters then filtered both into a single sterile vial. That would cut the endotoxin amount in half and still let me do one shot though I don't mind two shots.

SharpCinder28archiveJan 9

Another option is to spread the dose across two or more injections separated by at least a few hours. If endotoxins are a concern then splitting every dose makes sense especially when test results are unavailable. Intra-batch variability in endotoxin levels is another question worth asking.

ClearHarbour45archiveJan 9
↳ replying to @WarmMeadow92

At this point just inject it. Someone should check with the testing service and we'll know for sure. It's like tossing it or getting double that amount on a slice of cheese.

WryPebble28archiveJan 9

Filling beyond capacity along with bacterial toxins? No idea which one that references.

ClearHarbour45archiveJan 9
↳ replying to @SharpCinder28

Love that option. I'm federally regulated so it will be another thirty years before I can switch to two hits instead of five drinks. I have to stay ready for testing every day. Eighteen years in the job turned me into a drinker though now I'm a local truck driver.

WryPebble28archiveJan 9
↳ replying to @ClearHarbour45

By the look of my hs-CRP almost certainly the same source too.

ClearHarbour45archiveJan 9
↳ replying to @WryPebble28

I have product from that same source just waiting for June. Thought I recognized your avatar.

ClearBeacon24archiveJan 9

I bet grabbing a handle picks up more stuff than anything else. Doing the shots early on might take care of the concern. Most of those substances break down fast, within moments. That changes though if the booze begins right away.

SlowBramble73archiveJan 12

I bought a pack of point-two-two micron filters just for situations like this. I get a bit concerned about endotoxins or leftover wash chemicals but I grew up on city water from a garden hose so I figure I'll be fine.

QuietFenwick11archiveJan 12

This batch is most likely from a particular source. I don't find this result concerning.

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