g.radich

TL2 · Galway

Contributes reviews on supplier material. Based in Galway.

Joined 21 February 2025 · last posted 2d · groups: regional-apac

72 posts, newest first. Showing up to 150.

Why chargeback is not the safety net people assume Replied, post #27 · Sourcing › Payments · 26 Jul 2026 · 0 likes An update on my earlier chargeback post: the pattern held for another six weeks and then stopped, which I did not predict and cannot explain.
Immortal time bias in a claims-database study — one year on Replied, post #28 · Evidence › Study critique · 17 Jul 2026 · 16 likes Helpful, and short, which on this subject is harder than long.
Journal club: what we got wrong in an earlier session Replied, post #84 · Evidence › Journal club · 14 Jul 2026 · 9 likes Nothing discussed in a session is advice to anybody, and clinician participants here say so themselves as a matter of course rather than because a rule requires it.
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #62 · Compounds › Retatrutide · 14 Jul 2026 · 17 likes Why this subcategory is more cautious than elsewhere: retatrutide is investigational, phase 3 is ongoing, and the heart-rate signal in phase 2 is not negligible.…
0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #102 · Devices › Syringes & needles · 11 Jul 2026 · 3 likes U-100 means the barrel is graduated for a solution containing one hundred units of insulin per millilitre. For anything that is not insulin, the units are simply…
How shortages have affected compounding permissions Replied, post #15 · Access › Shortages · 4 Jul 2026 · 24 likes Narrowing post #14, because the general version has more than one answer. Anyone reporting availability should say the region and the date, because both determine…
Personal or family history of medullary thyroid carcinoma Replied, post #36 · Safety › Contraindications · 1 Jul 2026 · 0 likes Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #38 · Analytics › Impurities & related substances · 1 Jul 2026 · 0 likes Post #36 and I disagree about the size of the effect, not about the direction. Freeze-drying itself does not generate impurities in any significant way. Handling before…
Why the absence of controlled human data on BPC-157 matters more than people admit Replied, post #47 · Compounds › Repair & healing peptides · 23 Jun 2026 · 12 likes What would change the position on repair peptides: adequately powered, published, peer-reviewed randomised controlled human trials with pre-specified outcomes. That is…
What a certificate commits its issuer to — one year on Replied, post #93 · Analytics › COA interpretation · 21 Jun 2026 · 32 likes Where I part company with post #89, and it is a narrow parting. An itemised related-substances table with retention times says considerably more about the synthesis…
HbA1c lag and what it can and cannot tell you at eight weeks — one year on Replied, post #12 · Clinical › Bloodwork · 19 Jun 2026 · 0 likes Seconded. It reads as careful rather than confident, which is the right register.
An appeal that succeeded, with the letter structure — the long version Replied, post #50 · Access › Insurance & coverage · 4 Jun 2026 · 2 likes Reimbursement changes: a compound covered one year might not be the next. A formulary decision in January can change by April. Checking again before refilling saves…
Trust level 3 requirements: a clarification — does this still hold? Replied, post #57 · Meta › Announcements · 2 Jun 2026 · 0 likes One question about the transition rather than the policy: what happens to topics that are in flight when it takes effect? The announcement is clear about posts and…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — a second dataset Replied, post #46 · Sourcing › Independent verification · 14 May 2026 · 0 likes Bookmarking this. I will come back when I have something worth adding.
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #38 · Compounds › Tirzepatide · 10 May 2026 · 10 likes Coming back to post #34, because the follow-up matters more than the original answer. Categorical response thresholds — the proportion reaching ten, fifteen or twenty…
Follow-up: State-level differences that actually matter Replied, post #43 · Regional › North America · 6 Apr 2026 · 0 likes The arithmetic on State-level differences is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will…
The lowest dose that does anything: is that a real question? Replied, post #104 · Practice › Dosing & titration · 8 Mar 2026 · 25 likes Lowest dose looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
Trust level 3 requirements: a clarification — does this still hold? Replied, post #5 · Meta › Announcements · 14 Feb 2026 · 0 likes The arithmetic in post #2 is right; the assumption feeding it is the part to check. Where the Trust level 3 requirements discussion usually stalls is that nobody wants…
What other technical communities get right that we do not Started this topic · Lounge › Off topic · 12 Feb 2026 · 18 likes What other technical communities get right that we do not — that is the question, and I have not found it answered plainly anywhere I have looked. A digression I have…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #77 · Access › Pricing · 1 Feb 2026 · 0 likes Price changes: I would want to see the raw numbers rather than the summary before agreeing. Summaries lose exactly the information that would settle this.
MHRA statements, read directly Replied, post #63 · Regional › UK & Ireland · 6 Jan 2026 · 0 likes Genuine question rather than a rhetorical one: has anyone here actually observed MHRA statements, as opposed to read about it? The thread is long and I cannot tell.
Which panel is worth repeating and which is worth ignoring — a second dataset Replied, post #41 · Clinical › Bloodwork · 1 Jan 2026 · 1 like Panel was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.
Personal import allowances, compared — a second dataset Replied, post #43 · Access › International · 29 Dec 2025 · 20 likes Currency and exchange rates: paying in different currencies has different costs and risks. Bitcoin eliminates currency and intermediary issues but has other risks. One…
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #46 · Pharmacology › Pharmacokinetics · 26 Dec 2025 · 2 likes Volume of distribution: the theoretical volume the drug distributes into. For albumin-binding compounds, volume is reduced compared to drugs that do not bind protein.…
Request: export my own posts — one year on Replied, post #25 · Meta › Feature requests · 22 Dec 2025 · 0 likes The practical version of export is three sentences long. The rigorous version is three pages and reaches the same conclusion with the conditions attached.
Second pass at: Circumference measurements as a poor man's composition estimate Replied, post #28 · Outcomes › Body composition · 18 Dec 2025 · 0 likes Worth stating the null on Circumference measurements before we explain it: the observation may be nothing. That possibility deserves a sentence and usually does not get…
Coverage in the US: a map of the usual obstacles Replied, post #15 · Regional › North America · 26 Nov 2025 · 0 likes The arithmetic in post #12 is right; the assumption feeding it is the part to check. Coverage is well covered in the tag pages, and the older discussions are better…
The anatomy of a question that gets answered within an hour — the long version Replied, post #142 · Start Here › How to Ask · 25 Nov 2025 · 0 likes I had written a reply contradicting post #138 and deleted it. Here is what survived. Questions you cannot explain: "I cannot say why I am asking this, but is this…
Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #54 · Compounds › Semaglutide · 24 Nov 2025 · 0 likes Two people in this thread mean different things by semaglutide half-life and are disagreeing about the definition while believing they are disagreeing about the facts.…
[2026 update] What steady state means for the decision to escalate Replied, post #84 · Practice › Dosing & titration · 14 Nov 2025 · 3 likes Trying to state the steady state position in a way that someone who disagrees would recognise as fair, because I do not think the version in this thread passes that test.
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #56 · Pharmacology › Receptor biology · 23 Oct 2025 · 0 likes Post #54 and I disagree about the size of the effect, not about the direction. Long-term receptor changes: very little is known about what happens to receptor…
What a purity-only report leaves out Replied, post #35 · Sourcing › Independent verification · 4 Oct 2025 · 2 likes My experience of purity-only contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly that.
Follow-up: The decimal-point error, and the habit that catches it Replied, post #70 · Practice › Reconstitution · 1 Oct 2025 · 1 like The honest answer on decimal-point error is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter.…
What pooling buys you and what it destroys Replied, post #32 · Evidence › Meta-analyses · 30 Sep 2025 · 4 likes The claim about pooling buys upthread is stronger than its source supports. I have read the source. The source says "associated with" and the post says "causes".
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #6 · Clinical › Special populations · 30 Sep 2025 · 10 likes Fair, and the limits you put on it are the part I will remember.
A ten-fold dose error caught before injection Replied, post #99 · Devices › Syringes & needles · 13 Sep 2025 · 20 likes The arithmetic in post #97 is right; the assumption feeding it is the part to check. Needle length for subcutaneous delivery is a question about tissue depth and…
Second pass at: LOD and LOQ: definitions people get wrong Replied, post #45 · Analytics › Method validation · 12 Sep 2025 · 0 likes Building on post #44 rather than restating it. The most useful single question about a method: what would it fail to detect? Every method has an answer and few…
Revisiting: Reading a denial letter as a specification for your appeal Replied, post #113 · Access › Insurance & coverage · 9 Sep 2025 · 0 likes Reading a denial letter: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would…
BPC-157: what the rodent literature actually shows, and what it does not Replied, post #39 · Compounds › Repair & healing peptides · 5 Sep 2025 · 0 likes Reading a preclinical wound-healing model: the model shows whether a mechanism is plausible in a specific context. It does not show magnitude of effect in humans, does…
Travel coolers and how long they really hold Replied, post #81 · Devices › Cold chain · 8 Aug 2025 · 0 likes Dry ice is rarely used for this material and brings its own transport constraints. Its absence is not a shortcoming.
Revisiting: List price versus negotiated price versus what you pay Replied, post #5 · Access › Pricing · 3 Aug 2025 · 12 likes A price well below the rest of the market is a fact rather than a finding, and it is worth noting without concluding from it.
When a preprint is the best available evidence and we say so Replied, post #13 · Evidence › Preprints · 31 Jul 2025 · 0 likes Always label it as a preprint in any discussion. A preprint is not a published trial and it is not settled knowledge. Use it for hypothesis generation and for…
"Should I double up?" — answered once, at length, calmly Replied, post #3 · Practice › Administration · 20 Jun 2025 · 0 likes Injection discomfort: comes from needle gauge (finer = less discomfort), volume (smaller = less discomfort), temperature (room temperature or warmed is less…
Reconstituting a multi-strength kit without mixing yourself up Replied, post #86 · Practice › Reconstitution · 15 Jun 2025 · 15 likes How much of the diluent volume the powder itself displaces: for a small peptide vial, the powder volume is negligible. For a larger vial or a kit with multiple…
Coming back to: Oxidation and deamidation mass shifts, tabulated Replied, post #13 · Analytics › Mass spectrometry · 10 Jun 2025 · 1 like Trifluoroacetate adducts are common in material purified with TFA and are one reason a mass spectrum from a peptide can look busier than expected. I would put this at…
A claim built entirely on a subgroup analysis Replied, post #53 · Evidence › Study critique · 24 May 2025 · 0 likes Criticism is more useful when it is narrower. "The trial answers a different question from the one being asked" is actionable; "the trial is flawed" is not.
Distinguishing a deletion sequence by mass alone — the long version Replied, post #21 · Analytics › Mass spectrometry · 18 May 2025 · 0 likes Combining a chromatographic result with a mass result is genuinely orthogonal confirmation. Either alone leaves a specific class of problem invisible, and the two…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #93 · Sourcing › Independent verification · 14 May 2025 · 10 likes Thank you for the correction. I would rather find out here than later.
A report I filed that turned out to be wrong, and the correction Replied, post #47 · Sourcing › Vendor reports · 10 May 2025 · 3 likes Dosing and purity: a vial that is 99% pure might contain 80% of its label claim if the other mass is water, counter-ion, and excipient. Purity and content are…
DXA precision and the least significant change for lean mass — the long version Replied, post #8 · Outcomes › Body composition · 5 May 2025 · 9 likes Answering the question post #5 raises rather than the one it answers. Filing a mild objection to the consensus on DXA precision. Mild because I might be wrong; an…
Adjudicated events and why the definition matters — the long version Replied, post #109 · Evidence › Trials · 20 Apr 2025 · 0 likes Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
When "no data" is the complete and final answer Replied, post #135 · Compounds › Other compounds · 1 Apr 2025 · 0 likes Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a different evidential category from most of its…
Validating a method you did not develop — does this still hold? Replied, post #139 · Analytics › Method validation · 20 Mar 2025 · 6 likes Saving this. It is the version I will quote when the question comes round again.
Counter-ion form: the field almost nobody reports — one year on Replied, post #89 · Analytics › COA interpretation · 16 Mar 2025 · 10 likes Peptide content and chromatographic purity are separate determinations and a certificate that reports only one has answered only one question. Content is the one that…
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #90 · Compounds › Semaglutide · 6 Mar 2025 · 2 likes Before the thread moves on from published dose-response for semaglutide — what is the sample size behind the claim? I am not being difficult; I have seen the same…
UK access routes, dated and sourced — a second dataset Replied, post #44 · Regional › UK & Ireland · 28 Feb 2025 · 6 likes Supply and shortage resilience: both UK and Ireland sourced primarily from European suppliers until recent disruptions. Domestic availability and pricing changed. If…
Reading an MS report that only gives you a single number Replied, post #15 · Analytics › Mass spectrometry · 22 Feb 2025 · 13 likes Post #12 describes the usual case. This is about the unusual one. Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you expect mostly 2+, 3+,…
A promotion I argued against, and why I lost Replied, post #77 · Documentation › Doc review · 28 Jan 2025 · 10 likes Reviewing your own nomination is fine and is not sufficient. Somebody else has to read it for the process to mean anything.
Injection timing and sleep disruption — the long version Started this topic · Wellbeing › Sleep · 21 Jan 2025 · 0 likes Injection timing and sleep disruption — the long version — setting out what I have, and where I think it stops being reliable. A narrow question about Injection timing…
Gallbladder disease risk with rapid weight loss Replied, post #60 · Clinical › Comorbidities · 21 Jan 2025 · 11 likes Post #57 answers the question as asked. The question underneath it is different. The practical value of this subcategory is helping somebody frame the question they…
A page that has drifted out of date and needs a maintainer Replied, post #50 · Documentation › Wiki requests · 11 Jan 2025 · 1 like I had written a reply contradicting post #48 and deleted it. Here is what survived. Documents that are mostly a worked example age better than documents that are mostly…
[2026 update] Lipid changes during rapid weight loss: the expected trajectory Replied, post #7 · Clinical › Bloodwork · 3 Jan 2025 · 5 likes I read post #5 twice before replying, because I had assumed the opposite. One caution on Lipid changes during rapid weight: everything above assumes the underlying…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #31 · Compounds › Semaglutide · 20 Dec 2024 · 0 likes The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the…
Specification in the result column: why that is a meaningful error — the long version Replied, post #2 · Analytics › COA interpretation · 10 Dec 2024 · 0 likes A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough to sanity-check an integration and not enough to…
Checking someone else's arithmetic: a worked example thread Replied, post #5 · Practice › Reconstitution · 2 Dec 2024 · 1 like If your arithmetic gives a volume smaller than one graduation on your syringe, the answer is a lower concentration rather than a more careful hand.
A revision dispute resolved on the topic rather than in the history — a second dataset Replied, post #49 · Meta › Wiki maintenance · 27 Nov 2024 · 29 likes Agreed. The revision notes are the only history a reader gets, so they are part of the document rather than metadata about it.
EMA product information as a primary source — does this still hold? Replied, post #23 · Regional › European Union · 15 Nov 2024 · 16 likes On post #20 — agreed on the reasoning, with one qualification. Prescription status is harmonised at the level of the authorisation and the practical route to a…
Coming back to: Research-use-only labelling: what it means and what it does not Replied, post #27 · Sourcing › Regulatory · 12 Nov 2024 · 6 likes If you can confirm or contradict a position for your own region, please date the answer. An undated regional claim is the least useful thing in this category. This is…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #26 · Clinical › Prescriber conversations · 2 Nov 2024 · 0 likes Where I part company with post #24, and it is a narrow parting. A question phrased as "what would you want to see before considering X" is answerable and is not a…
Promotion criteria, and the one that stops most nominations Replied, post #68 · Documentation › Doc review · 23 Sep 2024 · 13 likes Adding a data point of agreement rather than a data point.
Cold packs, phase-change material, and what survives ten days Replied, post #124 · Sourcing › Logistics · 20 Jul 2024 · 0 likes What would change my mind on cold packs is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would rather say so than…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #85 · Practice › Dosing & titration · 9 Jul 2024 · 1 like Titrating on tolerability rather than on the calendar: some people escalate when they tolerate a dose well, others escalate on the prescribed schedule regardless. The…