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c/newbiequestions·posted 6 days ago by u/aurel_boateng

what is bac water and why does everyone keep saying it

Week One Receipts ×9

Asking properly rather than in a comment on somebody else’s thread: what is bac water and why does everyone keep saying it.

Concentration is mass over volume, and a U-100 syringe reads 100 units per millilitre. Those two facts are the whole of the arithmetic this board keeps explaining.

Week 2 for me was completely flat and I was convinced something was wrong. It was not. Month two was where everything happened.

I confused two very similar words on my first order and asked here, expecting to be mocked. Three people explained it properly instead.

Tell me where this is wrong. That is the useful part of posting it.

837 up / 94 down90% upvoted31 commentsid 1a0zen23 Jul 2026

31 comments

23 in this archive, depth 4

best — the order this archive was captured in

u/cato_batista84 points·4 days ago

Bacteriostatic water contains a preservative, which is what makes repeated entry into a vial reasonable. Sterile water does not, and the two are not interchangeable for that purpose.

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u/piotr_grimaldi68 points·4 days ago

pens and vials are the same molecule with different logistics

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u/greta_chukwu53 points·4 days ago

Yes. The starting dose is a tolerance step. It is not supposed to do very much.

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u/wholesome_lurker19 points·4 days ago

Bacteriostatic water contains a preservative, which is what makes repeated entry into a vial reasonable.

This is the answer. Everything else in the thread is elaboration on it.

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u/elin_trevino4 points·4 days ago

Cosigning the wiki point, and also: ask anyway. The wiki cannot tell you it understood your question.

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u/yannick_salinas56 points·4 days ago

What is the actual question underneath the question? Happy to answer both.

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u/ffmi_watcher19 points·4 days ago

What is the actual question underneath the question?

yannick_salinas has explained this better than the wiki does, which is saying something.

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u/karma_irrelevant40 points·6 days ago

This. Ask the basic question; the answers are what make the board searchable for the next person.

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u/hugo_norgaard28 points·6 days ago

Yes — nobody here is your clinician, and the good answers on this board all end with that.

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u/santiago_ndiaye36 points·5 days ago

read the wiki first, then ask anyway

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u/elise_grimaldi0 points·5 days ago

read the wiki first, then ask anyway

Adding the one habit worth starting today: write the concentration on the vial.

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u/aurel_boatengOP0 points·6 days ago

Pen or vial?

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u/aurel_boatengOP16 points·5 days ago

That is area percent from a certificate, not the amount of peptide in the vial. Two different numbers and a very common mix-up.

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u/britt_abubakar28 points·5 days ago

Agreed — week two with nothing on the scale is so common it should be in the sidebar. It probably is.

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u/pavel_kravchenko23 points·5 days ago

Not quite. Bacteriostatic and sterile water are different products and only one is intended for repeated entry.

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u/fasting_insulin_f14 points·5 days ago

Not quite.

Agreed, and for anyone finding this later: that is the normal experience, not a warning sign.

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u/enzo_fonseca24 points·6 days ago

Push back on the advice above: nobody here can tell a member what dose to take, however confidently it is phrased.

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u/mateusz_adebayo20 points·6 days ago

ask the dumb question, three other people are searching for it

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u/aurel_boatengOP13 points·5 days ago

ask the dumb question, three other people are searching for it

Slight disagreement with this bit only, because a beginner reading it might take it as a plan rather than a description.

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u/clara_danquah10 points·5 days ago

a COA is a certificate of analysis, the lab document for a batch

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u/reads_the_wiki12 points·5 days ago

Same. The injection was the thing I was most nervous about and the thing that turned out to matter least.

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u/nayeli_iyer9 points·4 days ago·edited

The injection was scarier in my head than in reality. It took about ten seconds and I felt slightly silly afterwards.

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u/dexa_twice_yearlybody comp6 points·4 days ago

week two with nothing happening is normal

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