k.haddad

TL2 Moderator · Osijek

Contributes reviews on supplier material. Based in Osijek.

Joined 15 March 2025 · last posted 9d

85 posts, newest first. Showing up to 150.

Muscle cramps: the ordinary causes before the exotic ones — a second dataset Replied, post #60 · Practice › Side effects · 19 Jul 2026 · 18 likes Hair shedding: telogen effluvium associated with rapid weight loss is reported. The timing usually correlates with the speed of weight change rather than the compound…
Tracking a shortage from primary sources rather than rumour Replied, post #105 · Access › Shortages · 16 Jul 2026 · 0 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…
Pooling trials with different estimands Replied, post #89 · Evidence › Meta-analyses · 11 Jul 2026 · 0 likes Pooled estimates and heterogeneity: when trials differ in population, duration, or comparator, a pooled estimate answers a question that no individual trial asked. High…
What a certificate commits its issuer to — one year on Replied, post #105 · Analytics › COA interpretation · 8 Jul 2026 · 21 likes A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is…
Shakes versus food: a pragmatic assessment Replied, post #21 · Nutrition & Training › Protein & intake · 3 Jul 2026 · 0 likes Fibre: adequate fibre intake supports fullness and gut motility, both of which matter during the gastrointestinal effects of these compounds. High fibre on top of…
Follow-up: Reading an interaction checker output critically Replied, post #24 · Practice › Interactions · 29 Jun 2026 · 1 like post #23 is right about the mechanism and I think understates the practical bit. Supplements and herbs: many have no established interaction. Some do. If you are taking…
Type 2 diabetes and the largest part of the evidence base — does this still hold? Replied, post #17 · Clinical › Comorbidities · 27 Jun 2026 · 10 likes PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and insulin resistance. Data on compounds in this class in PCOS specifically is…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #57 · Analytics › Impurities & related substances · 25 Jun 2026 · 5 likes I read post #55 twice before replying, because I had assumed the opposite. Aggregates: multiples of the monomer mass. May not elute at all under a standard…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #36 · Sourcing › Independent verification · 23 Jun 2026 · 8 likes This follows post #33 rather than contradicting it. Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks…
An appeal that succeeded, with the letter structure — the long version Replied, post #91 · Access › Insurance & coverage · 13 Jun 2026 · 3 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…
GHRH analogues versus ghrelin mimetics: different mechanisms, conflated discussion Replied, post #19 · Compounds › Secretagogues & GH axis · 7 Jun 2026 · 2 likes On post #15 — agreed on the reasoning, with one qualification. Why this subcategory is stricter about sourcing than most: the evidence base is weaker and that is…
[2026 update] Storing lyophilised material long term: what governs the shelf life Replied, post #126 · Practice › Storage & stability · 1 Jun 2026 · 4 likes Vial integrity: once a vial is entered with a needle repeatedly, the rubber closure degrades and the integrity fails. Using the same vial repeatedly over weeks or…
About the Comorbidities category Replied, post #3 · Clinical › Comorbidities · 29 May 2026 · 11 likes 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…
Prescription portability between countries Replied, post #41 · Access › International · 23 May 2026 · 18 likes Language barriers: if you need to communicate with a supplier, clinician, or regulator in a language not your first language, misunderstanding is possible. Clarify when…
Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #12 · Compounds › Semaglutide · 29 Apr 2026 · 1 like The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives you are not approaching steady state yet, which is…
CJC-1295 with and without DAC: what the modification does Replied, post #42 · Compounds › Secretagogues & GH axis · 26 Apr 2026 · 2 likes Coming back to post #40, because the follow-up matters more than the original answer. Ipamorelin selectivity claims originate in preclinical characterisation and are…
Subgroup analyses: pre-specified versus discovered — a second dataset Replied, post #44 · Evidence › Trials · 14 Apr 2026 · 4 likes Dropout is information: high dropout rates can indicate tolerability problems or lower efficacy than the summary suggests. Where the analysis handled dropouts matters.…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #13 · Devices › Syringes & needles · 6 Apr 2026 · 29 likes Coming back to post #11, because the follow-up matters more than the original answer. Syringe barrel size: common sizes are 0.3 mL, 0.5 mL, and 1.0 mL. Smaller barrels…
Revisiting: Liver enzymes drifting down and what that usually means Replied, post #17 · Clinical › Bloodwork · 1 Apr 2026 · 4 likes Coming back to post #15, because the follow-up matters more than the original answer. Analytical imprecision: any measurement has an error margin. A small difference in…
Managing an unplanned gap in supply Replied, post #77 · Access › Shortages · 29 Mar 2026 · 7 likes Patient advocacy during shortages: some advocacy groups advocate for patients during shortages. Knowing who they are and following their communication is useful.
Second pass at: Identical chromatograms across two different lots Replied, post #79 · Sourcing › Red flags · 20 Mar 2026 · 5 likes Worth separating two things that post #75 runs together. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you did…
Measurement error in home scales, with a worked standard deviation Replied, post #27 · Research Methods › Statistics · 19 Mar 2026 · 1 like I read post #25 twice before replying, because I had assumed the opposite. Regression to the mean: if you select people with extreme values (very high or very low),…
Choosing which test to pay for, given a fixed budget Replied, post #22 · Sourcing › Independent verification · 12 Mar 2026 · 0 likes Worth separating two things that post #18 runs together. Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is…
Measurement error in a self-reported exposure Replied, post #15 · Evidence › Study critique · 22 Feb 2026 · 1 like Bias towards the null and bias away from the null: different criticisms have different directions. Differential dropout might bias away from null; conservative…
Coming back to: The SOUL trial and oral semaglutide cardiovascular outcomes Replied, post #103 · Compounds › Oral incretins · 21 Feb 2026 · 0 likes post #102 answers the question as asked. The question underneath it is different. Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg…
A history of disordered eating: proceeding carefully Replied, post #73 · Wellbeing › Mental health · 25 Jan 2026 · 19 likes post #72 is right about the mechanism and I think understates the practical bit. Substance use: if someone has a history of substance use, appetite suppression and…
The headache that turns out to be dehydration Replied, post #148 · Nutrition & Training › Hydration & electrolytes · 21 Jan 2026 · 28 likes Potassium: similar to sodium; losing weight involves some potassium loss. Bananas, sweet potatoes, and other potassium-rich foods help. Severe depletion is rare but…
Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #12 · Analytics › Mass spectrometry · 19 Jan 2026 · 32 likes Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
Coming back to: Private prescribing in the UK: what is actually involved Replied, post #26 · Regional › UK & Ireland · 31 Dec 2025 · 10 likes post #25 is right about the mechanism and I think understates the practical bit. Importing for personal use: importing a prescription-only medicine without a…
The decimal-point error, and the habit that catches it Replied, post #83 · Practice › Reconstitution · 17 Dec 2025 · 27 likes Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL. On a U-100 syringe at that concentration, 100 units = 1 mL = 2.5 mg, so…
Prescription requirements and telehealth models Replied, post #57 · Sourcing › Regulatory · 9 Dec 2025 · 21 likes Approval versus licensing: a compound can be approved for a specific indication in one country and not approved at all in another. Tracking jurisdictional approval is…
Revisiting: Aggregates and why a purity assay may miss them entirely Replied, post #39 · Analytics › Impurities & related substances · 22 Nov 2025 · 0 likes Related substances: compounds chemically related to the target peptide but not the target peptide itself. The standard method separates them and reports them as area…
Freeze-thaw and why one cycle is not the same as five Replied, post #25 · Practice › Storage & stability · 20 Nov 2025 · 15 likes post #24 is right about the mechanism and I think understates the practical bit. Visual inspection: if a solution is visibly cloudy, discoloured, or contains particles,…
How to read a phase 2 result without treating it as a phase 3 result Replied, post #5 · Compounds › Retatrutide · 14 Nov 2025 · 17 likes Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that…
Micro-titration: a disputed topic, argued properly Replied, post #2 · marked as the solution · Practice › Dosing & titration · 8 Nov 2025 · 7 likes the opening post is right about the mechanism and I think understates the practical bit. How the published trials escalated: they used specific step sizes and…
High-resolution MS on aggregates and what it can see Replied, post #112 · Analytics › Mass spectrometry · 5 Nov 2025 · 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…
Journal club: the retatrutide phase 2 obesity paper Replied, post #9 · Evidence › Journal club · 4 Nov 2025 · 4 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
Power cut for eleven hours: how I assessed it afterwards Replied, post #88 · Practice › Storage & stability · 9 Oct 2025 · 0 likes Visual inspection: if a solution is visibly cloudy, discoloured, or contains particles, those are red flags. Faint opalescence or minor colour shift may be normal but…
Payment method and the leverage it gives you, ranked Replied, post #77 · Sourcing › Payments · 25 Sep 2025 · 9 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…
Journal club: STEP-HFpEF and symptom endpoints — a second dataset Replied, post #15 · Evidence › Journal club · 23 Sep 2025 · 21 likes On post #11 — agreed on the reasoning, with one qualification. Session format: read the paper before posting. The discussion is much better when everyone has. Start…
Older adults, sarcopenia risk, and the trade-off nobody quantifies — the long version Replied, post #20 · Clinical › Special populations · 10 Sep 2025 · 25 likes Older adults: sarcopenia risk is higher, polypharmacy is common, and the clinical trials did not enroll many people over 75. Extrapolating to very old people is…
Why "any advice?" is the least effective ending for a post — the long version Replied, post #50 · Start Here › How to Ask · 7 Sep 2025 · 5 likes Lab result questions: state the result, the reference interval, and what else is on the same panel. A single flag on a single draw is usually uninformative without…
Adolescents: a distinct evidence base — one year on Replied, post #12 · Clinical › Special populations · 28 Aug 2025 · 0 likes Hepatic impairment: less is known about dosing in significant liver disease than in kidney disease. Extreme caution applies because the liver metabolises a large…
A preprint whose numbers changed substantially at publication Replied, post #13 · Evidence › Preprints · 8 Aug 2025 · 0 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…
Promotion criteria, and the one that stops most nominations — the long version Replied, post #35 · Documentation › Doc review · 3 Aug 2025 · 1 like 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.
BPC-157: what the rodent literature actually shows, and what it does not Replied, post #24 · Compounds › Repair & healing peptides · 29 Jul 2025 · 0 likes post #23 answers the question as asked. The question underneath it is different. Oral versus injected administration claims for BPC-157: the preclinical work studied…
What a documentation review can and cannot tell you Replied, post #51 · Sourcing › Independent verification · 28 Jul 2025 · 14 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…
Follow-up: Why we hide unevidenced fraud accusations and log the hiding Replied, post #10 · Sourcing › Red flags · 26 Jul 2025 · 6 likes Safety documentation absent: a supplier that cannot provide information about sterility testing, endotoxin testing, or safety documentation when asked is raising flags.
Coming back to: When "no data" is the complete and final answer Replied, post #52 · Compounds › Other compounds · 20 Jul 2025 · 13 likes On post #48 — agreed on the reasoning, with one qualification. Sequence verification: for an obscure compound, a report of the amino acid sequence or a…
Forced degradation studies: designing one that is informative — does this still hold? Replied, post #42 · Analytics › Method validation · 18 Jul 2025 · 0 likes Accuracy: the method measures what you intend to measure. For purity methods, this is tested by spike-and-recover experiments: add a known amount of impurity to a…
[2026 update] What we do not know about retatrutide, listed explicitly Replied, post #14 · Compounds › Retatrutide · 17 Jul 2025 · 19 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.
A calculator that gives a right answer to the wrong question — does this still hold? Started this topic · Data & Tools › Calculators · 13 Jul 2025 · 0 likes A calculator that gives a right answer to the wrong question — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is…
Trial registration and comparing the protocol with the paper Replied, post #18 · Evidence › Trials · 30 Jun 2025 · 0 likes Worth separating two things that post #14 runs together. Multiplicity and multiple comparisons: if a trial tests many hypotheses, the chance of a false positive on at…
Anxiety in the first weeks: drug, situation, or both Replied, post #104 · Wellbeing › Mental health · 18 Jun 2025 · 30 likes Support and community: some people process weight change through community (online or in-person). Others prefer privacy. Knowing what you need and seeking it…
Foaming during reconstitution and whether it matters Replied, post #16 · Practice › Reconstitution · 16 Jun 2025 · 2 likes This follows post #13 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Coming back to: Official shortage notices and what they authorise Replied, post #25 · Access › Shortages · 9 Jun 2025 · 0 likes On post #21 — agreed on the reasoning, with one qualification. Communication from suppliers: a supplier having supply problems usually communicates them. If a supplier…
Half-life, steady state, and accumulation worked through Replied, post #29 · Pharmacology › Pharmacokinetics · 27 May 2025 · 2 likes Half-life: semaglutide ≈ 165–184 hours (about a week). Tirzepatide ≈ 5 days. Liraglutide ≈ 13 hours. The half-life determines how much accumulation happens at steady…
Asking about a compound your prescriber has not heard of Replied, post #45 · Clinical › Prescriber conversations · 21 May 2025 · 13 likes Preparing for an appointment: bring recent bloodwork, a list of current medications with doses and timing, and any questions written out. Written questions get better…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #111 · Practice › Reconstitution · 20 May 2025 · 7 likes post #110 is right about the mechanism and I think understates the practical bit. A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #3 · Data & Tools › Calculators · 12 May 2025 · 1 like Worth separating two things that the opening post runs together. Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs…
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #53 · Compounds › Tirzepatide · 12 May 2025 · 13 likes SURMOUNT-1 reported weight reduction of a magnitude that was the largest for a pharmacological intervention at that time of publication. It also reported a clear dose…
A claim built entirely on a subgroup analysis Replied, post #2 · Evidence › Study critique · 22 Apr 2025 · 5 likes Defending a paper against criticism: if the authors respond, they might clarify something the paper explained poorly. Their response might also miss your point. Either…
Adjudicated events and why the definition matters — the long version Replied, post #82 · Evidence › Trials · 5 Apr 2025 · 18 likes Picking up post #79: that is the part I would want checked first. Surrogate endpoints: an endpoint that is not the outcome that matters but is measured as a stand-in.…
[2026 update] US compounding rules and how they changed Replied, post #5 · marked as the solution · Regional › North America · 24 Mar 2025 · 7 likes Canada: Health Canada licenses compounds. Prescribing is provincial. Compounds are prescription-only. Coverage varies between public and private insurance.
Counter-ion form: the field almost nobody reports — one year on Replied, post #34 · Analytics › COA interpretation · 28 Feb 2025 · 8 likes Water content (residual moisture) matters: lyophilised peptide is not dry. A few percent water is normal. The difference between a TFA salt and an acetate salt can be…
Telehealth prescribing models in the US Replied, post #62 · Regional › North America · 23 Feb 2025 · 20 likes post #61 is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather than…
Distinguishing a deletion sequence by mass alone Replied, post #92 · Analytics › Mass spectrometry · 15 Feb 2025 · 17 likes Worth separating two things that post #88 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #103 · Evidence › Meta-analyses · 12 Feb 2025 · 0 likes On post #99 — agreed on the reasoning, with one qualification. Funnel plots: a plot of study effect size versus sample size that helps detect publication bias. If small…
Recovery when intake is low: what to cut first Replied, post #40 · Nutrition & Training › Resistance training · 12 Jan 2025 · 0 likes Coming back to post #38, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
Dose numbers for oral formulations are not comparable to injectable ones — a second… Replied, post #39 · Compounds › Oral incretins · 11 Jan 2025 · 9 likes This follows post #36 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Fixed versus detachable needles: the trade-offs Replied, post #102 · Devices › Syringes & needles · 9 Jan 2025 · 14 likes Insulin syringe graduations: U-100 syringes are marked in units where 100 units = 1 mL. Always confirm your syringe is U-100. Confusion between insulin units and…
Books and papers worth reading that are not about this at all Replied, post #15 · Lounge › Off topic · 7 Jan 2025 · 0 likes Science communication: if you come across an interesting science paper or article about peptides or metabolism, sharing it and discussing the idea is on-topic.
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Started this topic · Compounds › Tirzepatide · 1 Jan 2025 · 58 likes Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — setting out what I have, and where I think it stops being reliable. Comparing SURMOUNT-2 (…
Persistent vomiting and the threshold for seeking help — one year on Replied, post #23 · Safety › Adverse events · 20 Dec 2024 · 16 likes Psychological adverse events: mood changes, anxiety, or suicidal ideation warrant discussion with a mental health professional. These are rare but real.
[2026 update] New subcategory: rationale and scope Replied, post #28 · Meta › Announcements · 28 Nov 2024 · 0 likes Scheduled maintenance: if the site is going offline for maintenance, advance notice will be posted here with the duration and scope.
Why "any advice?" is the least effective ending for a post Replied, post #69 · Start Here › How to Ask · 24 Nov 2024 · 0 likes I read post #67 twice before replying, because I had assumed the opposite. Arithmetic questions: write out the steps. "I have a 10 mg vial, I added 2 mL, I want a 0.25…
Sample size intuition for a personal experiment Replied, post #2 · Research Methods › Statistics · 8 Nov 2024 · 2 likes Absence of evidence and evidence of absence: if a study is small and finds no effect, that is absence of evidence, not evidence of absence. A larger study might find an…
Research-use-only labelling: what it means and what it does not — the long version Replied, post #18 · Sourcing › Regulatory · 29 Oct 2024 · 19 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…
Irish differences from the UK position Replied, post #33 · Regional › UK & Ireland · 12 Oct 2024 · 0 likes Cross-border arrangements: some people source from other EU countries. Rules on import for personal use are changing post-Brexit. Current status requires checking with…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #3 · Access › Shortages · 8 Oct 2024 · 14 likes Coming back to the opening post, because the follow-up matters more than the original answer. Supply interruptions: official shortage notices are published by…
Progressive overload when the scale is falling — one year on Replied, post #74 · Nutrition & Training › Resistance training · 20 Sep 2024 · 7 likes Worth separating two things that post #70 runs together. Adaptation and plateau: if strength does not change for weeks, that is stability, not backsliding. Expecting…
Circumference measurements as a poor man's composition estimate Replied, post #106 · Outcomes › Body composition · 28 Aug 2024 · 16 likes post #105 is right about the mechanism and I think understates the practical bit. Comparison to published data: the trials reported mean fat and lean mass changes.…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #36 · Analytics › COA interpretation · 25 Aug 2024 · 20 likes I read post #34 twice before replying, because I had assumed the opposite. Purity and content are different measurements: purity tells you what proportion of the…
Guidelines revision: what changed and why Replied, post #5 · Meta › Announcements · 24 Jul 2024 · 18 likes Staff-only posts: some announcements are visible only to staff (concerning internal operations). Members see public announcements.
Cold packs, phase-change material, and what survives ten days Replied, post #17 · Sourcing › Logistics · 15 Jun 2024 · 1 like post #16 is right about the mechanism and I think understates the practical bit. Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is…