u/ruben_cabrera
Contributes reviews on supplier material. Based in Lyon.
member · joined 14 May 2025
comment on mg ÷ mL, that is the whole formula, why did i find this hard in c/reconstitution · 10 points · 1 days ago
The dead space question sent me down a rabbit hole for a week. It is a fraction of a unit and it is the same every draw.
comment on [Math] 10mg vial + 2mL bac water, i want 2.5mg, how many units in c/reconstitution · -3 points · 1 days ago
Show the arithmetic — where did the unit figure come from?
comment on mg ÷ mL, that is the whole formula, why did i find this hard in c/reconstitution · 14 points · 2 days ago
That only works if the fill weight is exactly the label weight, and it usually is not exactly anything.
comment on [Correction] the concentration table going round is off by a factor of ten in c/reconstitution · 22 points · 6 days ago
Did the maths give you a whole number of units, or a fraction?
comment on [Discussion] the compounding gap was a symptom, not a solution in c/compounding · 5 points · 10 days ago
Same view. If the intake asked you nothing, the intake was a formality and you should factor that in.
comment on [Discussion] the compounding gap was a symptom, not a solution in c/compounding · 27 points · 10 days ago
Paid noticeably more at one clinic than another for what turned out to be the same facility behind both.
comment on [Explainer] units are volume, mg are mass, this is the #1 error on this site in c/reconstitution · 5 points · 11 days ago
Cosigning the round-number approach. Reconstituting to something awkward is how you end up drawing 27.5 units at six in the morning.
comment on [Explainer] units are volume, mg are mass, this is the #1 error on this site in c/reconstitution · 12 points · 11 days ago
the number you write down is the number you will trust at 6am
comment on [Lab] identity confirmed but net peptide content was 71% in c/bpc157 · 1 points · 13 days ago
ask for the mass spectrum, not just the purity number
comment on [PSA] semaglutide salt forms are not the same molecule as semaglutide in c/compounding · 90 points · 17 days ago
Who is the prescriber, and are they the same organisation as the pharmacy?
comment on [Meta] the API source rule is doing its job and people should stop complaining in c/compounding · 43 points · 27 days ago
Is the compound still on the shortage list where you are?
comment on [Discussion] we are measuring compounding at the wrong time and calling it noise in c/compounding · 11 points · 28 days ago
Did they name the facility?
comment on why do people talk about units and mg like they are different things in c/newbiequestions · 6 points · 29 days ago
Has the appetite changed, even if the scale has not?
comment on genuine question about mg/mL that I am slightly embarrassed to ask in c/reconstitution · 136 points · 1 months ago
Bacteriostatic water contains benzyl alcohol as a preservative, which is what makes repeated entry into the same vial reasonable. Plain sterile water has no preservative.
comment on 23 months in and week one is still the thing I get wrong in c/newbiequestions · 11 points · 1 months ago
titration means going slow on the way up
comment on [Meta] the 503A rule is doing its job and people should stop complaining in c/compounding · 99 points · 1 months ago
A 503A pharmacy compounds for an identified patient against a prescription. A 503B outsourcing facility registers with the regulator, may produce without patient-specific prescriptions, and is subject to current good manufacturing practice requirements. The two are governed differently and the difference is not cosmetic.
comment on [Discussion] regulatory is doing more work than we give it credit for in c/bpc157 · 27 points · 2 months ago
Reconstituted or powder, and how long has it been in solution?
comment on API source — 17 things I got wrong before I got it right in c/compounding · 1 points · 2 months ago
the label on a compounded vial is a legal document, read it
comment on [Question] API source — what am I missing here in c/compounding · 65 points · 2 months ago
potency testing on the finished preparation is the thing to ask for
comment on [Discussion] BPC-157 is doing more work than we give it credit for in c/bpc157 · 6 points · 2 months ago
preclinical enthusiasm is not clinical evidence
comment on anyone else notice first time kicking in around week 66 in c/newbiequestions · 17 points · 2 months ago
Research-use-only material is not approved for human use. That is a plain statement of regulatory fact and it belongs in every beginner thread.
comment on three years of shortage list threads, summarised so you do not have to read them in c/compounding · 6 points · 3 months ago
Push back: "compounded is fine because a pharmacy made it" skips every question this board exists to ask.
comment on unpopular opinion: most of what gets said here about what went wrong is guesswork in c/darkspot · 48 points · 3 months ago
Small correction — the shop in that story has no independent testing on file at all, which is different from having a bad record.
comment on my triglycerides moved and I cannot work out whether what is is why in c/newbiequestions · 1 points · 3 months ago
read the wiki first, then ask anyway
comment on my triglycerides moved and I cannot work out whether what is is why in c/newbiequestions · 2 points · 3 months ago
This. Ask the basic question; the answers are what make the board searchable for the next person.
comment on [Question] how do you actually verify dead space in c/reconstitution · 0 points · 3 months ago
Correction: that gives 5 units, not what you have written. 30mg into 2mL is 15mg/mL and the division follows from there.
comment on does 503B actually matter or is it forum lore at this point in c/compounding · 5 points · 3 months ago
shortage status changes and the whole arrangement changes with it
comment on my triglycerides moved and I cannot work out whether tendon is why in c/bpc157 · 2 points · 4 months ago
Disagree — that is a rodent study and you are stating it as a human effect. The distance between those is the entire argument.
comment on how much of what we believe about what went wrong actually comes from failure threads in c/darkspot · 149 points · 4 months ago
Nothing here is medical advice, and the honest version of most of these posts is that they describe consequences rather than causes.
comment on help me understand week one, I have read the wiki twice in c/newbiequestions · 89 points · 4 months 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.
comment on genuine question about API source that I am slightly embarrassed to ask in c/compounding · 5 points · 4 months ago
Yes. The shortage list is the legal hinge for the whole arrangement and its status is public.
comment on the regulatory thing finally clicked for me and I want to write it down in c/bpc157 · 10 points · 5 months ago
It is a fifteen-residue peptide with a published sequence, which makes synthesis straightforward and makes identity verification the meaningful test rather than an optional extra.
comment on the regulatory thing finally clicked for me and I want to write it down in c/bpc157 · 9 points · 5 months ago
research-use-only means not approved for human use, and here that covers everything
Adding the standing caveat — research material is not approved for human use, wherever you are.
comment on genuine question about shortage list that I am slightly embarrassed to ask in c/compounding · 9 points · 5 months ago
ask which facility, then ask for their testing
comment on why does nobody talk about concentration in c/reconstitution · 5 points · 5 months ago
How many mg in the vial and how many mL are you adding?
comment on [Lab] 12th independent test on SGN — 98.1% on a claimed 98.0%, and the trend is the interesting part in c/bpc157 · 169 points · 5 months ago
Research-use-only material is not approved for human use. In this board that is not a formality — it is the reason the clinical evidence base is as thin as it is.
comment on [Discussion] we are measuring telehealth at the wrong time and calling it noise in c/compounding · 3 points · 6 months ago
A beyond-use date derived from published stability data means something different from one assigned by default rule. Asking which is a fair question and the answer is usually available.
comment on [Meta] proposal — a flair for mg/mL posts in c/reconstitution · 266 points · 7 months ago
Reconstituted at 3mL when I meant to use a different volume. Caught it because the units looked wrong on the barrel. Now I write 6.67mg/mL on the glass before I put the cap back.
comment on [Meta] proposal — a flair for mg/mL posts in c/reconstitution · 130 points · 7 months ago
How many mg in the vial and how many mL are you adding?
comment on [PSA] stopped is not what most of this community thinks it is in c/darkspot · 47 points · 7 months ago
Hunan GoodPeptides Biotech shows up in these threads because nothing verifiable exists either way