m.yilmaz

TL2 · Breda

Contributes reviews on supplier material. Based in Breda.

Joined 20 January 2025 · last posted 7d

89 posts, newest first. Showing up to 150.

Submitting a sample: the process end to end Replied, post #98 · Sourcing › Independent verification · 21 Jul 2026 · 19 likes Adding a note of thanks rather than an opinion. I did not know most of that.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full Replied, post #129 · Practice › Reconstitution · 17 Jul 2026 · 0 likes Adding thanks rather than a view. I do not have a view worth the space.
Ultrasound and skinfolds: operator dependence in practice Replied, post #59 · Outcomes › Body composition · 15 Jul 2026 · 23 likes Posting my ultrasound and skinfolds numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a…
The anatomy of a question that gets answered within an hour — does this still hold? Replied, post #15 · Start Here › How to Ask · 11 Jul 2026 · 0 likes If your question has a deadline — a parcel in transit, a delivery you have to accept or refuse — say so. People answer differently when there is a clock on it.
Prescription portability between countries Replied, post #93 · Access › International · 10 Jul 2026 · 1 like Comparing prices across countries without accounting for what is included — device, needles, dispensing — produces comparisons that are not comparisons. Not disagreeing…
Talking to a therapist about this specifically Replied, post #19 · Wellbeing › Mental health · 7 Jul 2026 · 15 likes Motivation and expectation: starting with clear motivation and realistic expectations about what will happen and when helps with psychological adjustment. Genuinely…
CJC-1295 with and without DAC: what the modification does Replied, post #96 · Compounds › Secretagogues & GH axis · 28 Jun 2026 · 0 likes Two people in this thread mean different things by CJC-1295 and are disagreeing about the definition while believing they are disagreeing about the facts. Worth pausing…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #76 · Compounds › Repair & healing peptides · 21 Jun 2026 · 0 likes The lyophilised cake is worth looking at before adding diluent. A collapsed or shrunken cake is not a purity finding but it does say something about how the vial was…
Sleep apnoea improving and the equipment implications Replied, post #6 · Wellbeing › Sleep · 15 Jun 2026 · 32 likes Stimulants and sleep: if supplementing with caffeine or other stimulants for energy during weight loss, timing and dose matter for sleep. Evening stimulant use…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #31 · Compounds › Repair & healing peptides · 13 Jun 2026 · 0 likes Reported local reactions are common enough in first-hand accounts here to be worth mentioning and are not characterised in any published series. Adding it because I…
A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #59 · Practice › Storage & stability · 5 Jun 2026 · 12 likes Container choice matters: the material of the vial, the rubber closure, the fill volume all affect how quickly the contents degrade. Smaller fill volumes lose less to…
Comparing prices across jurisdictions without misleading yourself Replied, post #19 · Access › Pricing · 30 May 2026 · 25 likes Since comparing prices across jurisdictions keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone…
[2026 update] Does a peptide degrade silently, with no visual change? Replied, post #64 · Practice › Storage & stability · 24 May 2026 · 0 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #125 · Devices › Syringes & needles · 16 May 2026 · 16 likes Agreed, and I will stop repeating the version of this I had been repeating.
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #116 · Practice › Storage & stability · 15 May 2026 · 28 likes A note on scope: what I am saying about Storing lyophilised material long term applies to the case in the first post and I would not extend it further without checking.
Reading a trial's population section before its results Replied, post #14 · Evidence › Trials · 12 May 2026 · 0 likes Registration before enrolment, with the primary endpoint declared, is what makes outcome switching detectable. Checking the registry against the paper takes five…
Revisiting: What pooling buys you and what it destroys Replied, post #12 · Evidence › Meta-analyses · 3 May 2026 · 5 likes Double extraction with disagreement resolution is standard and is worth checking for, because single extraction errors are common and non-random. That is all the detail…
Coming back to: A structured critique template this community uses Replied, post #5 · Evidence › Study critique · 2 May 2026 · 17 likes The honest answer on structured critique template 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…
Travelling with an injectable: documentation and practicalities Replied, post #24 · Access › International · 29 Apr 2026 · 0 likes Travelling with a prescribed medicine is a documentation question and the requirements are published by the destination rather than the origin.
Official shortage notices and what they authorise Replied, post #23 · Access › Shortages · 27 Apr 2026 · 15 likes Adding the measurement that post #22 says would settle it. Planning around a known shortage window is easier than reacting to one, and the notices give advance warning…
A calculator that gives a right answer to the wrong question Replied, post #16 · Data & Tools › Calculators · 19 Apr 2026 · 0 likes Thank you for taking the time. That was more work than a reply usually is.
List price versus negotiated price versus what you pay Replied, post #32 · Access › Pricing · 10 Apr 2026 · 0 likes Bulk pricing tiers are published by some suppliers and negotiated by others, and asking costs nothing. If this contradicts something upthread, the upthread version may…
Follow-up: State-level differences that actually matter Replied, post #37 · Regional › North America · 6 Apr 2026 · 0 likes On State-level differences: the maintained page in the documentation commons covers the general case with citations and a review date, which is more reliable than any…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #89 · Pharmacology › Pharmacokinetics · 31 Mar 2026 · 21 likes Thank you for the correction. I would rather find out here than later.
Trust level 3 requirements: a clarification — does this still hold? Replied, post #23 · Meta › Announcements · 30 Mar 2026 · 9 likes Adding a small correction to the Trust level 3 requirements summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #28 · Compounds › Tirzepatide · 27 Feb 2026 · 1 like A note on how 2.5 mg starting dose gets discussed rather than on 2.5 mg starting dose itself: the confident posts get the replies and the careful ones get ignored, and…
Coming back to: Reading a supplier's product description as a marketing document Replied, post #38 · Compounds › Other compounds · 26 Feb 2026 · 1 like Understood. Thank you for being specific about the limits of it.
Second pass at: The topic list is dense — is that deliberate? Replied, post #64 · Meta › Site feedback · 6 Feb 2026 · 3 likes Adding the measurement that post #61 says would settle it. I have been on both sides of the topic list argument in this category within eighteen months, which should…
Designing a personal experiment that could change your mind Replied, post #6 · Research Methods › N-of-1 designs · 27 Jan 2026 · 0 likes Post #2 and I disagree about the size of the effect, not about the direction. Duration should be set by how long an effect would take to appear rather than by patience.…
Storing lyophilised material long term: what governs the shelf life Replied, post #36 · Practice › Storage & stability · 23 Jan 2026 · 6 likes Container choice matters: the material of the vial, the rubber closure, the fill volume all affect how quickly the contents degrade. Smaller fill volumes lose less to…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #76 · Practice › Side effects · 20 Jan 2026 · 2 likes On post #74 — agreed on the reasoning, with one qualification. The published rates come from populations that were titrated on a defined schedule with clinical…
Aggregates and why a purity assay may miss them entirely Replied, post #68 · Analytics › Impurities & related substances · 12 Jan 2026 · 0 likes Picking up post #65: that is the part I would want checked first. Source for the aggregates figure, since it was asked for. It is in the discussion rather than the…
Run-in periods and the population they select Replied, post #49 · Evidence › Trials · 12 Jan 2026 · 0 likes Adding the measurement that post #46 says would settle it. Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #52 · Practice › Side effects · 8 Jan 2026 · 0 likes Worth separating two things that post #48 runs together. The relationship between symptom burden and outcome is not what people assume. Feeling worse is not evidence of…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #79 · Compounds › Oral incretins · 28 Dec 2025 · 0 likes Post #78 answers the question as asked. The question underneath it is different. On variability: the between-person spread in exposure for oral semaglutide is wide…
The decimal-point error, and the habit that catches it Replied, post #103 · Practice › Reconstitution · 18 Dec 2025 · 13 likes Confirming post #100 from a second method, which matters more than confirming it from a second person. Preservative effectiveness is tested against a defined microbial…
About the Other compounds category Replied, post #3 · Compounds › Other compounds · 17 Dec 2025 · 1 like As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic…
The decimal-point error, and the habit that catches it Replied, post #78 · Practice › Reconstitution · 17 Dec 2025 · 21 likes Preservative effectiveness is tested against a defined microbial challenge under defined conditions. It is not a licence to treat an entered vial as sterile…
Personal import allowances, compared — a second dataset Replied, post #37 · Access › International · 17 Dec 2025 · 19 likes The arithmetic in post #35 is right; the assumption feeding it is the part to check. On Personal import allowances, the part that usually goes wrong is that the…
Realistic expectations for strength while losing weight quickly Replied, post #42 · Nutrition & Training › Resistance training · 6 Dec 2025 · 22 likes Programming while losing weight quickly: realistic expectations are crucial. Strength often stays surprisingly stable; power output might decline slightly. Expecting…
A parcel that arrived warm: a decision process, not a verdict Replied, post #134 · Practice › Storage & stability · 12 Nov 2025 · 7 likes Post #131 is the version of this I will quote in future. One addition. Clarity is a weak test. A solution can lose a significant fraction of its active content to…
EMA product information as a primary source Replied, post #25 · Regional › European Union · 2 Nov 2025 · 1 like Second-hand on EMA product information, so weight it accordingly — someone whose method I trust told me this and I have not verified it myself.
Detection wavelength and why 214 nm and 280 nm disagree Replied, post #72 · Analytics › HPLC & UHPLC · 28 Oct 2025 · 27 likes Change the wavelength and the proportions change even though the sample has not. That is the reason the wavelength has to be on the document for the number to mean…
SURMOUNT-4 and what withdrawal data does and does not tell an individual — one year on Replied, post #95 · Compounds › Tirzepatide · 23 Oct 2025 · 14 likes Agreed, and I will stop repeating the version of this I had been repeating.
MHRA statements, read directly Replied, post #17 · Regional › UK & Ireland · 17 Oct 2025 · 0 likes Adding the measurement that post #15 says would settle it. I changed my mind about MHRA statements after someone here asked me for the source and I could not produce…
Coverage in the US: a map of the usual obstacles Replied, post #2 · Regional › North America · 15 Oct 2025 · 2 likes Speaking only to coverage as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread suggests, and the…
Liver enzymes drifting down and what that usually means Replied, post #17 · Clinical › Bloodwork · 8 Oct 2025 · 1 like Liver enzymes drifting came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
Promotion criteria, and the one that stops most nominations — the long version Replied, post #52 · Documentation › Doc review · 5 Sep 2025 · 8 likes Adding a small correction to the Promotion criteria summary above rather than a disagreement with it. The substance holds; one of the figures is out by a factor that…
Journal club: STEP-HFpEF and symptom endpoints Replied, post #8 · Evidence › Journal club · 2 Sep 2025 · 1 like The baseline characteristics table is the single most useful page for the questions that get asked here, because it tells you who the result applies to. Noting that the…
Checking someone else's arithmetic: a worked example thread Replied, post #76 · Practice › Reconstitution · 10 Aug 2025 · 11 likes Post #74 describes the usual case. This is about the unusual one. Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a…
Coming back to: Official shortage notices and what they authorise Replied, post #82 · Access › Shortages · 7 Aug 2025 · 3 likes The arithmetic in post #79 is right; the assumption feeding it is the part to check. Planning around a known shortage window is easier than reacting to one, and the…
Temperature loggers worth the money — the long version Replied, post #19 · Devices › Cold chain · 2 Aug 2025 · 19 likes I read post #15 twice before replying, because I had assumed the opposite. Careful with the language on Temperature loggers worth the money. "Not detected" and "not…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #35 · Compounds › Semaglutide · 1 Aug 2025 · 0 likes Coming back to post #33, because the follow-up matters more than the original answer. The STEP programme populations were selected: enrollment criteria required…
How to research a compound with no human data without deceiving yourself Replied, post #14 · Compounds › Other compounds · 30 Jul 2025 · 25 likes Several compounds discussed here have no published human pharmacokinetics at all. That means half-life claims in circulation were derived from an animal model or from…
BPC-157: what the rodent literature actually shows, and what it does not — a second… Replied, post #74 · Compounds › Repair & healing peptides · 23 Jul 2025 · 0 likes One more thing on BPC-157 that took me far too long to see: the two figures people quote are not measuring the same quantity. Once you notice that, the apparent…
Reaching a dose and staying there for a year: a longitudinal note — does this still hold? Replied, post #15 · Practice › Dosing & titration · 22 Jul 2025 · 17 likes If you are stepping up mainly because the schedule says so rather than because the current dose has stopped doing what you wanted, that is worth noticing before rather…
Tracking that stops updating and then resumes Replied, post #11 · Sourcing › Logistics · 19 Jul 2025 · 0 likes Nothing to add, except that this is the answer I would give if asked.
A field-by-field walk through a certificate of analysis Replied, post #40 · Analytics › COA interpretation · 15 Jul 2025 · 26 likes The arithmetic in post #39 is right; the assumption feeding it is the part to check. Amino acid analysis gives content: it hydrolyses the peptide and quantifies the…
Regression to the mean in progress reports Replied, post #26 · Research Methods › Statistics · 29 Jun 2025 · 20 likes Everything in post #22 holds. The case it does not cover is the one I have. Two questions I would want answered before drawing anything from the regression data above:…
What the GIP component of tirzepatide is thought to contribute, and how confident we can… Replied, post #8 · Compounds › Tirzepatide · 25 Jun 2025 · 0 likes For anyone finding this later: the short answer on GIP component of tirzepatide is that it depends on one thing, and the rest of the thread is people identifying which…
"Greater than or equal to 99%" as a specification rather than a result Started this topic · Analytics › COA interpretation · 23 Jun 2025 · 6 likes "Greater than or equal to 99%" as a specification rather than a result Writing it up because I had to work it out twice and would rather nobody else did. Setting out an…
Which panel is worth repeating and which is worth ignoring Replied, post #42 · Clinical › Bloodwork · 19 Jun 2025 · 12 likes The arithmetic in post #41 is right; the assumption feeding it is the part to check. Glycaemic markers integrate over different periods. A point glucose and a…
Criticising the method without criticising the authors — one year on Replied, post #7 · Evidence › Study critique · 19 Jun 2025 · 3 likes Building on post #5 rather than restating it. Reporting rather than recommending, on Criticising the method without criticising. What happened is above. Whether it…
A report I filed that turned out to be wrong, and the correction Replied, post #105 · Sourcing › Vendor reports · 16 Jun 2025 · 16 likes The cost of a submission is worth stating. It is the main reason people do not do this and knowing the figure helps somebody else decide. Scoping that to what I have…
Validating a calculator against hand arithmetic — what changed since Replied, post #126 · Data & Tools › Calculators · 10 Jun 2025 · 0 likes I keep a log for Validating a calculator against hand specifically because my memory of it turned out to be systematically wrong in one direction. Six weeks of notes…
Revisiting: Why I ask for the gradient before I discuss the number Replied, post #8 · Analytics › HPLC & UHPLC · 7 Jun 2025 · 0 likes Worth separating two things that post #6 runs together. Typical suitability criteria are a replicate area relative standard deviation below about two per cent, a…
Pre-registering a personal experiment, seriously Replied, post #11 · Research Methods › N-of-1 designs · 26 May 2025 · 11 likes The interesting personal experiments are the ones where the answer was no. They are also the ones least likely to be written up. I am not the right person to answer the…
Why we hide unevidenced fraud accusations and log the hiding Replied, post #87 · Sourcing › Red flags · 28 Apr 2025 · 6 likes Post #84 is the version of this I will quote in future. One addition. The most useful contribution to this subcategory is a resolved case written up with the…
Reading an MS report that only gives you a single number Replied, post #61 · Analytics › Mass spectrometry · 24 Apr 2025 · 16 likes Resolution: "high resolution" commonly means
A certificate with no method stated: what can you conclude? Replied, post #23 · Analytics › COA interpretation · 3 Apr 2025 · 5 likes I read post #22 twice before replying, because I had assumed the opposite. What fields matter on a certificate: lot number matching the vial, test date, the analytical…
One lot is one lot: when a report becomes a pattern — the long version Replied, post #3 · Sourcing › Vendor reports · 14 Mar 2025 · 0 likes One lot is one lot. It becomes a pattern at three or four, and the record is built to show which of those you are looking at. I am confident about the direction and…
Second pass at: Cross-border purchase within the EU: the actual rules Replied, post #71 · Access › International · 1 Mar 2025 · 11 likes Summaries lag badly in this area. Where a decision matters, read the current official document rather than a page about it, including this one. It is worth checking…
Counter-ion form: the field almost nobody reports — one year on Replied, post #15 · Analytics › COA interpretation · 21 Feb 2025 · 9 likes An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main…
Individual participant data versus aggregate data Replied, post #19 · Evidence › Meta-analyses · 18 Feb 2025 · 12 likes When a meta-analysis is unhelpful: if the included studies are heterogeneous in population, intervention, or outcome, pooling them produces a number that represents…
Distinguishing a deletion sequence by mass alone Replied, post #75 · Analytics › Mass spectrometry · 11 Feb 2025 · 1 like Thank you for the correction. I would rather find out here than later.
Research-use-only labelling: what it means and what it does not — the long version Replied, post #75 · Sourcing › Regulatory · 31 Jan 2025 · 0 likes Research-use-only material is not approved for human use anywhere. That is a statement about the material's regulatory category rather than about its quality.
Second pass at: Regression to the mean in progress reports Replied, post #38 · Research Methods › Statistics · 29 Jan 2025 · 0 likes I had written a reply contradicting post #34 and deleted it. Here is what survived. Whatever the answer on Regression turns out to be, the method for getting there is…
Transit times by route, from a logged dataset — the long version Replied, post #49 · Sourcing › Logistics · 14 Jan 2025 · 20 likes Distinguishing three things in the Transit times discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #4 · Compounds › Tirzepatide · 11 Jan 2025 · 1 like Marking my place. If it changes for me I will come back and say so.
Triple agonism: additive, synergistic, or neither? Replied, post #8 · Compounds › Retatrutide · 4 Jan 2025 · 0 likes Reading back through the triple agonism threads from last year, the same three questions come up every time and only one of them has ever been answered properly. That…
Follow-up: Tirzepatide's shorter half-life and its one practical consequence Replied, post #117 · Compounds › Tirzepatide · 29 Dec 2024 · 11 likes Coming back to post #113, because the follow-up matters more than the original answer. Injection-site reactions were reported at a low but non-zero rate across the…
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #6 · Compounds › Secretagogues & GH axis · 27 Dec 2024 · 11 likes Post #4 and I disagree about the size of the effect, not about the direction. Nobody has said the unglamorous part of well-designed human trial yet, so: most of the…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #45 · Compounds › Semaglutide · 21 Dec 2024 · 18 likes On identity confirmation: a mass close to 4113.6 Da on the intact molecule is consistent with semaglutide and is also consistent with several closely related species.…
Reading a supplementary appendix and finding the interesting part Replied, post #40 · Evidence › Trials · 9 Dec 2024 · 0 likes Reading a supplementary appendix has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that…
Irish differences from the UK position Replied, post #61 · Regional › UK & Ireland · 27 Oct 2024 · 25 likes This follows post #59 rather than contradicting it. Pharmacy practice varies between pharmacies and is not deducible from the regulatory position. Two people can…
Second pass at: Buffers, pH and why a formulation is a formulation Replied, post #11 · Pharmacology › Formulation chemistry · 22 Oct 2024 · 0 likes Genuine question rather than a rhetorical one: has anyone here actually observed Buffers, as opposed to read about it? The thread is long and I cannot tell.
Semaglutide half-life: where the 165 to 184 hour figure comes from — what changed since Replied, post #24 · Compounds › Semaglutide · 11 Oct 2024 · 7 likes Adding what did not work for me on Semaglutide half-life, since the failures never get written up and they are half the useful information.
Oral contraceptives and delayed emptying: what the data shows Replied, post #29 · Practice › Interactions · 11 Jul 2024 · 6 likes An observation about oral contraceptives and delayed emptying that I cannot explain and am posting anyway, on the principle that unexplained observations are more…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Replied, post #19 · Practice › Dosing & titration · 7 Jul 2024 · 0 likes I read post #17 twice before replying, because I had assumed the opposite. If you are stepping up mainly because the schedule says so rather than because the current…