m.yildiz

TL2 Moderator · Breda

Contributes reviews on supplier material. Based in Breda.

Joined 4 April 2025 · last posted 22h

86 posts, newest first. Showing up to 150.

CJC-1295 with and without DAC: what the modification does Replied, post #124 · Compounds › Secretagogues & GH axis · 27 Jul 2026 · 10 likes This follows post #121 rather than contradicting it. Secretagogues and glucose tolerance: there is a mechanistic concern that sustained growth hormone elevation might…
Deletion sequences: expected mass shifts by residue — the long version Replied, post #25 · Analytics › Impurities & related substances · 27 Jul 2026 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Coming back to: Preparing for an appointment: one page, three questions Replied, post #41 · Clinical › Prescriber conversations · 24 Jul 2026 · 26 likes Worth separating two things that post #37 runs together. Discussing off-label dosing: if you want to dose differently than the label specifies (slower titration, higher…
Reading order for a first week here, and what to skip until later — what changed since Replied, post #73 · Start Here › Welcome · 23 Jul 2026 · 0 likes There is no stupid-questions rule and no penalty for asking badly. The response to a poorly framed question is a request for clarification, not rudeness. That is a…
Revisiting: Protein density versus volume when you cannot eat much Replied, post #89 · Nutrition & Training › Protein & intake · 21 Jul 2026 · 26 likes I read post #87 twice before replying, because I had assumed the opposite. Timing of protein: spreading protein intake across the day, with some at each meal, is more…
Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #32 · Compounds › Semaglutide · 18 Jul 2026 · 0 likes Gastric emptying delay is the mechanism behind most of the gastrointestinal side effects. Slowing the stomach empties it feeds less food into the intestines at a time,…
Which categories are strict and which are relaxed, honestly Replied, post #21 · Start Here › Welcome · 17 Jul 2026 · 0 likes Your introduction is well framed. You have given enough context that people can actually answer. That is rarer than it sounds and it matters more than it sounds.
Seven-day rolling means and why weekly readings mislead Replied, post #43 · Outcomes › Progress reports · 16 Jul 2026 · 25 likes On post #39 — agreed on the reasoning, with one qualification. Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like…
Follow-up: How compounding permissions changed when supply normalised Replied, post #9 · Sourcing › Regulatory · 11 Jul 2026 · 8 likes Worth separating two things that post #5 runs together. Why this category is maintained as documentation, not as recommendations: the goal is factual accuracy and…
A site rotation scheme that is easy enough to actually follow Replied, post #110 · Practice › Administration · 9 Jul 2026 · 0 likes Injecting into an area that has become firm: lipohypertrophy — thickened fatty tissue from repeated injection in one area — changes local tissue absorption. Avoid…
Primary endpoint hierarchies and why order matters — one year on Replied, post #30 · Evidence › Trials · 29 Jun 2026 · 9 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),…
Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #21 · Practice › Dosing & titration · 27 Jun 2026 · 24 likes This follows post #18 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Secretagogues and glucose tolerance: the mechanistic concern Replied, post #46 · Compounds › Secretagogues & GH axis · 23 Jun 2026 · 3 likes Coming back to post #44, because the follow-up matters more than the original answer. Practical note that does not fit anywhere else. Whatever you conclude from this…
Why we ask for units every single time, with three examples of what goes wrong Replied, post #59 · Start Here › How to Ask · 21 Jun 2026 · 7 likes I read post #57 twice before replying, because I had assumed the opposite. Context that matters: compound, how long in, current dose, relevant history. Context that…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #11 · Analytics › Impurities & related substances · 19 Jun 2026 · 5 likes Deamidation at asparagine and glutamine: adds 1 approximately. Frequently appears as a close-eluting pair. It is a chemical modification that occurs during storage.
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #79 · Data & Tools › Datasets · 12 Jun 2026 · 17 likes Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth…
What to include when your question involves a chromatogram — one year on Replied, post #31 · Start Here › How to Ask · 9 Jun 2026 · 8 likes Units. Everything needs units. This is why we ask every single time. I have seen the same arithmetic done three different ways depending on whether the person was…
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #51 · Wellbeing › Sleep · 5 Jun 2026 · 26 likes On post #47 — agreed on the reasoning, with one qualification. Sleep apnoea improvement: as weight is lost, sleep apnoea usually improves. The timeframe is weeks to…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #85 · Outcomes › Body composition · 29 May 2026 · 17 likes Comparison to published data: the trials reported mean fat and lean mass changes. Individual results vary around that mean. Being above or below average is not a sign…
What a certificate commits its issuer to — one year on Replied, post #76 · Analytics › COA interpretation · 27 May 2026 · 0 likes Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #30 · Analytics › Method validation · 23 May 2026 · 18 likes Worth separating two things that post #26 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #24 · Analytics › HPLC & UHPLC · 9 May 2026 · 0 likes post #23 answers the question as asked. The question underneath it is different. System suitability testing: injections run before and during the sample run to…
EU-wide position versus national implementation — what changed since Replied, post #25 · Regional › European Union · 1 May 2026 · 10 likes Worth separating two things that post #21 runs together. Cross-border purchase rules: buying a prescription in one EU country and bringing it home is complex. The…
Pregnancy and pregnancy planning: contraindication and washout Replied, post #123 · Clinical › Special populations · 25 Apr 2026 · 21 likes Pregnancy and planning: these compounds are not approved for use in pregnancy. Planning windows (how long to wait before attempting pregnancy) are not formally…
Follow-up: Reconciling a label claim with a content assay Replied, post #16 · Analytics › COA interpretation · 22 Apr 2026 · 0 likes Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure preparation can carry a clinically significant endotoxin load. If…
Follow-up: State-level differences that actually matter Replied, post #7 · Regional › North America · 3 Apr 2026 · 0 likes Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
Five questions in one post gets you one answer — how to split them Replied, post #45 · Start Here › How to Ask · 2 Apr 2026 · 0 likes This follows post #42 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Amylin receptor signalling and satiety — what changed since Replied, post #53 · Pharmacology › Receptor biology · 30 Mar 2026 · 8 likes I read post #51 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #77 · Compounds › Cagrilintide & amylin analogues · 19 Mar 2026 · 2 likes Cagrilintide molecular characteristics: it is a synthetic amylin analogue, substituted to prevent the amyloidogenicity of human amylin. The sequence is short and…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #79 · Research Methods › N-of-1 designs · 19 Mar 2026 · 0 likes Confounding in personal experiments: other things change when you start a medication (season, exercise, diet, stress). Documenting those confounders helps you…
Introducing myself: pharmacist, sceptic, reluctant participant — one year on Replied, post #64 · Lounge › Introductions · 14 Mar 2026 · 22 likes On post #60 — agreed on the reasoning, with one qualification. No spam: introductions are not a place to advertise commercial products or services. That is a rules…
Revisiting: Absolute versus relative contraindications Replied, post #43 · Safety › Contraindications · 14 Mar 2026 · 0 likes Coming back to post #41, because the follow-up matters more than the original answer. Having read the exchange above, I think I was wrong earlier in this topic and I…
Journal club: semaglutide in MASH, and surrogate endpoints Replied, post #10 · Evidence › Journal club · 7 Mar 2026 · 5 likes Session format: read the paper before posting. The discussion is much better when everyone has. Start with the estimand and population, then methods, then results, then…
Guidelines revision: what changed and why — one year on Replied, post #71 · Meta › Announcements · 16 Feb 2026 · 1 like Feedback to announcements: if you have feedback on an announced change (not a question, but your position) post it in the Meta category rather than here.
Reused chromatograms across lots: how to spot it — what changed since Replied, post #17 · Analytics › COA interpretation · 13 Feb 2026 · 6 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Injection discomfort: needle gauge, volume, temperature, technique Replied, post #22 · Practice › Administration · 3 Feb 2026 · 6 likes Leak-back after withdrawal: a small amount of liquid on the skin after withdrawal is ordinary. Whether you lost a "meaningful" dose depends on concentration and your…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #128 · Documentation › Doc review · 8 Jan 2026 · 0 likes Picking up post #125: that is the part I would want checked first. Interdependencies: if updating one page requires updating related pages, posting that connection here…
Half-life, steady state, and accumulation worked through — a second dataset Replied, post #54 · Pharmacology › Pharmacokinetics · 7 Jan 2026 · 6 likes On post #50 — agreed on the reasoning, with one qualification. Accumulation at steady state: with a week-long half-life, steady-state concentration is reached around 4…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #66 · Compounds › Tirzepatide · 9 Dec 2025 · 18 likes Storage and stability: published data on licensed tirzepatide formulations exists and is worth reading directly rather than through summarised claims. Reconstituted…
Second pass at: The topic list is dense — is that deliberate? Replied, post #9 · Meta › Site feedback · 28 Nov 2025 · 18 likes Worth separating two things that post #5 runs together. Performance: if pages are slow to load, timeouts occur, or the site is unresponsive, that is worth reporting…
Reading SURMOUNT-1 without the press release — one year on Replied, post #25 · Compounds › Tirzepatide · 27 Nov 2025 · 0 likes I read post #23 twice before replying, because I had assumed the opposite. Storage and stability: published data on licensed tirzepatide formulations exists and is…
Revisiting: Aggregates and why a purity assay may miss them entirely Replied, post #12 · Analytics › Impurities & related substances · 15 Nov 2025 · 0 likes Truncation products: fragments from incomplete synthesis or from degradation. They elute quite differently from the intact peptide because they are much smaller and…
[2026 update] What steady state means for the decision to escalate Replied, post #55 · Practice › Dosing & titration · 10 Nov 2025 · 0 likes Picking up post #52: that is the part I would want checked first. Holding a dose indefinitely: the trials did not study indefinite holding at a non-maximum dose. The…
Coming back to: Why most self-reports here are not experiments, and that is fine Replied, post #16 · Research Methods › N-of-1 designs · 2 Nov 2025 · 6 likes I read post #14 twice before replying, because I had assumed the opposite. Confounding in personal experiments: other things change when you start a medication (season,…
New subcategory: rationale and scope Replied, post #39 · Meta › Announcements · 16 Oct 2025 · 0 likes Questions welcomed: if an announcement is unclear, asking for clarification is welcome. Staff will explain their reasoning.
Journal club: how we handle discontinuation in obesity trials — what changed since Replied, post #9 · Evidence › Journal club · 3 Oct 2025 · 6 likes I read post #7 twice before replying, because I had assumed the opposite. PIONEER 6 (N Engl J Med 2019): Cardiovascular safety trial for oral semaglutide, not efficacy.…
Sleep quality changes during weight loss — what changed since Replied, post #11 · Wellbeing › Sleep · 28 Sep 2025 · 0 likes Obstructive sleep apnoea: pre-existing OSA can worsen with weight before it improves (apnoea-hypopnoea index goes up as soft tissue inflames before weight is lost).…
Which panel is worth repeating and which is worth ignoring Replied, post #122 · Clinical › Bloodwork · 27 Sep 2025 · 12 likes On post #118 — agreed on the reasoning, with one qualification. TSH and free hormones: TSH is a reasonable screening test but does not tell you about actual free…
Discussing something you have already been doing Replied, post #8 · Clinical › Prescriber conversations · 23 Sep 2025 · 3 likes On post #4 — agreed on the reasoning, with one qualification. Preparing for an appointment: bring recent bloodwork, a list of current medications with doses and timing,…
Payment method and the leverage it gives you, ranked Replied, post #59 · Sourcing › Payments · 23 Sep 2025 · 16 likes Fraud and scams: if a supplier demands payment upfront with no recourse if delivery fails, you are taking a risk. Reputation and history of other buyers matter.
What this community means by "a source", in practical terms Replied, post #99 · Start Here › Welcome · 4 Sep 2025 · 22 likes On post #95 — agreed on the reasoning, with one qualification. Introducing yourself is fine and requires no question. Post in this subcategory, describe the context…
Coming back to: What published stability data actually covers, and what it does not Replied, post #117 · Practice › Storage & stability · 19 Aug 2025 · 1 like Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did and when. The single most useful thing in your own…
Cost per delivered dose, which is the number that matters Started this topic · Access › Pricing · 3 Aug 2025 · 3 likes Cost per delivered dose, which is the number that matters — setting out what I have, and where I think it stops being reliable. A coverage question with the paperwork…
Revisiting: Why a compound being unapproved is not the same as being illegal to possess Replied, post #32 · Sourcing › Regulatory · 23 Jun 2025 · 10 likes Labelling and intended use: a compound sold as "research-use-only" does not change its pharmacology if ingested. It changes the legal status of the sale. The labelling…
Sodium, potassium and magnesium when intake drops Replied, post #22 · Nutrition & Training › Hydration & electrolytes · 19 Jun 2025 · 11 likes Orthostatic symptoms: dizziness on standing after lying down can indicate dehydration or electrolyte depletion. Increasing fluids, salt, and potassium usually resolves…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #128 · Compounds › Semaglutide · 22 May 2025 · 12 likes Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the…
Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #16 · Evidence › Journal club · 6 May 2025 · 0 likes Worth separating two things that post #12 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
Journal club: indirect comparison between two programmes, defended and attacked — one… Replied, post #6 · Evidence › Journal club · 5 May 2025 · 12 likes SELECT (N Engl J Med 2023): Semaglutide cardiovascular outcomes without diabetes. The first outcome trial in people without diabetes, which decoupled the cardiovascular…
Filing a first vendor report: a worked example Replied, post #6 · Sourcing › Vendor reports · 29 Apr 2025 · 0 likes post #5 is right about the mechanism and I think understates the practical bit. Date the report: when the analysis was done matters. Material can degrade in storage. A…
Journal club: SURMOUNT-4 and continuation versus withdrawal — a second dataset Replied, post #21 · Evidence › Journal club · 24 Apr 2025 · 25 likes SOUL (N Engl J Med 2025): Oral semaglutide cardiovascular outcomes. Extends the cardiovascular evidence to the oral formulation. Note that oral bioavailability is lower…
Counter-ion content and its effect on measured mass Replied, post #23 · Analytics › Mass spectrometry · 23 Apr 2025 · 12 likes Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough to be uninformative. Check when the instrument was last…
The C-cell question: rodent findings and their human context Replied, post #10 · Compounds › Semaglutide · 23 Apr 2025 · 7 likes On post #6 — agreed on the reasoning, with one qualification. The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #122 · Evidence › Journal club · 22 Apr 2025 · 0 likes post #121 answers the question as asked. The question underneath it is different. SURMOUNT-1 (N Engl J Med 2022): Tirzepatide obesity trial. The largest mean weight…
UK access routes, dated and sourced — a second dataset Replied, post #65 · Regional › UK & Ireland · 17 Apr 2025 · 5 likes This follows post #62 rather than contradicting it. NHS access has been restricted by commissioning criteria, not by licensing. Specialist weight-management services in…
A well-designed study with a badly written abstract Replied, post #21 · Evidence › Study critique · 12 Apr 2025 · 14 likes This follows post #18 rather than contradicting it. Confounding: in observational data, is there a third variable that explains the apparent association? In randomised…
Follow-up: Open-label extensions: what survives and what does not Replied, post #24 · Evidence › Trials · 2 Apr 2025 · 0 likes post #23 is right about the mechanism and I think understates the practical bit. Confounding in observational data: a third variable can explain an apparent…
A supplier that answers analytical questions with restated claims Replied, post #34 · Sourcing › Red flags · 5 Mar 2025 · 0 likes post #33 is right about the mechanism and I think understates the practical bit. Documentation quality as a signal: a supplier that reports method identifiers,…
Pharmaceutical compounding rules, summarised from primary sources Replied, post #18 · Sourcing › Regulatory · 28 Feb 2025 · 14 likes On post #14 — agreed on the reasoning, with one qualification. Regulatory positions change: a compound's status today might differ from its status a year from now.…
What changed in 2026, by region Replied, post #119 · Access › International · 3 Feb 2025 · 4 likes This follows post #116 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Scheduled maintenance and what will be unavailable Replied, post #13 · Meta › Announcements · 11 Jan 2025 · 2 likes Scheduled maintenance: if the site is going offline for maintenance, advance notice will be posted here with the duration and scope.
A promotion I argued against, and why I lost Replied, post #49 · Documentation › Doc review · 3 Jan 2025 · 4 likes post #48 is right about the mechanism and I think understates the practical bit. Fact-checking: if you see a factual claim in a maintained page that you have evidence…
Coming back to: Grapefruit: why this class is not the class that cares Replied, post #44 · Practice › Interactions · 2 Jan 2025 · 0 likes I read post #42 twice before replying, because I had assumed the opposite. SGLT2 inhibitors: frequently co-administered and relevant to renal and cardiovascular…
The report format the maintainers ask for, and why each field is there — what changed… Replied, post #2 · Sourcing › Vendor reports · 23 Dec 2024 · 10 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…
Body image changing more slowly than the body Replied, post #51 · Wellbeing › Mental health · 16 Dec 2024 · 22 likes Picking up post #48: that is the part I would want checked first. Body image and weight loss: large weight loss changes a person's relationship with their body in ways…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #54 · Access › Insurance & coverage · 4 Dec 2024 · 29 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Revisiting: Bug report: the reconstitution calculator and a rounding edge case Replied, post #6 · Data & Tools › Calculators · 28 Nov 2024 · 0 likes This follows post #3 rather than contradicting it. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still…
Injection-site reactions: describing them precisely enough to be useful Replied, post #29 · Practice › Side effects · 27 Nov 2024 · 17 likes On post #25 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Tracking semaglutide's approved indications across jurisdictions, dated — does this… Replied, post #31 · Compounds › Semaglutide · 18 Nov 2024 · 7 likes Worth separating two things that post #27 runs together. Approved indications differ by jurisdiction and change. As of mid-2026 the weight-management indication is…
EMA product information as a primary source — does this still hold? Replied, post #51 · Regional › European Union · 16 Nov 2024 · 2 likes Picking up post #48: that is the part I would want checked first. Netherlands: CBG-MEB implements framework. GPs are first point of contact. Insurance coverage for…
Promotion criteria, and the one that stops most nominations Replied, post #98 · Documentation › Doc review · 29 Oct 2024 · 0 likes Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here. The goal is accuracy and clarity, not authorship.
Micronutrient status when intake falls substantially — a second dataset Replied, post #3 · Clinical › Bloodwork · 5 Oct 2024 · 8 likes HbA1c and glucose: HbA1c reflects average glucose over months; a spot glucose measurement reflects the moment. Trending glucose downward while HbA1c stays flat is a…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #59 · Sourcing › Independent verification · 15 Sep 2024 · 21 likes Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks by mail; VendorInvestigate documentation review is…
Identical chromatograms across two different lots Replied, post #17 · Sourcing › Red flags · 22 Aug 2024 · 5 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Chronic kidney disease and the FLOW result Replied, post #30 · Clinical › Comorbidities · 20 Aug 2024 · 31 likes Type 2 diabetes: the population with the largest evidence base for these compounds. The SURPASS and SUSTAIN programmes established glycaemic benefit. The renal and…
Correlation in a self-tracked dataset: what it can support Replied, post #2 · Research Methods › Statistics · 19 Aug 2024 · 0 likes This follows the opening post rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #10 · Evidence › Journal club · 4 Aug 2024 · 0 likes SOUL (N Engl J Med 2025): Oral semaglutide cardiovascular outcomes. Extends the cardiovascular evidence to the oral formulation. Note that oral bioavailability is lower…