m.steiner

TL2 Moderator · Ghent

Contributes reviews on supplier material. Based in Ghent.

Joined 2 July 2025 · last posted 6d

82 posts, newest first. Showing up to 150.

Common supplements people ask about, assessed one at a time Replied, post #82 · Practice › Interactions · 22 Jul 2026 · 0 likes post #81 is right about the mechanism and I think understates the practical bit. I disagree with the reply above, and I think the disagreement is substantive rather…
PIONEER 6 cardiovascular safety, read as a safety trial rather than an efficacy one Replied, post #15 · Compounds › Oral incretins · 21 Jul 2026 · 19 likes PIONEER 6 was a cardiovascular safety trial for oral semaglutide, not an efficacy trial. Non-inferiority for safety was demonstrated. The point estimates favoured the…
Seven-day rolling means and why weekly readings mislead Replied, post #68 · Outcomes › Progress reports · 20 Jul 2026 · 0 likes Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful than "currently at 82 kg" because the rate tells you whether the change is steady,…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #78 · Analytics › Impurities & related substances · 15 Jul 2026 · 0 likes Acetate content: counter-ion content. Trifluoroacetate or acetate from the salt form of the peptide. Affects mass calculations and should be stated on a complete…
Packaging that arrived damaged: documenting it properly Replied, post #35 · Sourcing › Logistics · 2 Jul 2026 · 0 likes Picking up post #32: that is the part I would want checked first. Declaring contents accurately: declaring accurately reduces intervention risk. A declaration of…
Reading a rodent study on a secretagogue without over-extrapolating — the long version Replied, post #16 · Compounds › Secretagogues & GH axis · 30 Jun 2026 · 0 likes Ipamorelin selectivity claims originate in preclinical characterisation and are reasonably well supported for what they claim: less effect on cortisol and prolactin…
Pages past their review date, listed — does this still hold? Replied, post #21 · Meta › Wiki maintenance · 22 Jun 2026 · 9 likes Orphaned pages: if a page has no incoming links and is not reachable from navigation, it is orphaned. Such pages should either be linked or deprecated.
Splitting an overlong document into two Replied, post #23 · Documentation › Wiki requests · 3 Jun 2026 · 10 likes Flag a page that has drifted: if you notice a maintained page has information that is outdated (dates that have passed, regulatory changes, new evidence) post a flag so…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #88 · Sourcing › Logistics · 1 Jun 2026 · 24 likes Insurance and carrier liability: most parcel carriers limit liability. Understanding the limits before choosing a carrier matters if you are shipping expensive material.
Five questions in one post gets you one answer — how to split them Replied, post #91 · Start Here › How to Ask · 26 May 2026 · 0 likes Disagreement-style questions: "I read this and it contradicts what I heard here, which is right?" is answerable. "Is this a bad idea?" without giving the context is not.
What to include when your question involves a chromatogram — one year on Replied, post #12 · Start Here › How to Ask · 22 May 2026 · 17 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.
Two scans six weeks apart on different machines: a cautionary tale Replied, post #23 · Outcomes › Body composition · 21 May 2026 · 1 like This follows post #20 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #11 · Compounds › Semaglutide · 18 May 2026 · 13 likes Albumin binding is not a unique structural feature and nothing in the class lacks it, but the reversibility matters. Semaglutide binds albumin covalently through a…
Transporting a vial for a weekend away — a second dataset Replied, post #56 · Practice › Storage & stability · 18 May 2026 · 9 likes Temperature excursions: if a vial sat at room temperature for a time, the question is whether the excursion was long enough to cause damage. Hours at room temperature…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #48 · Compounds › Semaglutide · 2 May 2026 · 25 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.
Anaesthesia and elective surgery: the aspiration question Replied, post #105 · Practice › Interactions · 29 Apr 2026 · 0 likes Alcohol: no absolute contraindication but it raises gastrointestinal irritation risk and this drug class already does that. The conservative position during titration…
Two scans six weeks apart on different machines: a cautionary tale Replied, post #8 · Outcomes › Body composition · 29 Apr 2026 · 1 like Ultrasound: thickness of subcutaneous fat at specific sites. Less standardised than DXA and operator-dependent. Useful as a supplementary measure but not as a primary…
Dizziness on standing and the electrolyte explanation — does this still hold? Replied, post #70 · Practice › Side effects · 19 Apr 2026 · 6 likes Lean mass loss: the rate of lean tissue loss depends on protein intake, resistance training volume, and total energy deficit. Adequate protein and maintaining training…
About the Interactions category Replied, post #5 · Practice › Interactions · 13 Apr 2026 · 0 likes Alcohol: no absolute contraindication but it raises gastrointestinal irritation risk and this drug class already does that. The conservative position during titration…
Spike-and-recover accuracy for a peptide assay Replied, post #34 · Analytics › Method validation · 8 Apr 2026 · 29 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…
A plateau that disappeared when I changed how I measured Replied, post #27 · Outcomes › Progress reports · 28 Mar 2026 · 1 like post #26 answers the question as asked. The question underneath it is different. Menstrual cycle: for people who menstruate, weight can shift by several pounds across…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #6 · Evidence › Preprints · 5 Mar 2026 · 1 like On post #2 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #11 · Compounds › Repair & healing peptides · 17 Feb 2026 · 0 likes Analytical identity of BPC-157: a 15-residue peptide with an unambiguous mass (≈1419.5 Da). Identity confirmation by LC-MS is trivially easy, which means there is no…
[2026 update] Confounding by indication, explained with a concrete example Replied, post #57 · Evidence › Study critique · 16 Feb 2026 · 20 likes This follows post #54 rather than contradicting it. Choosing the worst interpretation: "The confidence interval includes a harmful effect" is true if the CI goes from…
Mass error in ppm: the arithmetic and the caveat Replied, post #107 · Analytics › Mass spectrometry · 15 Feb 2026 · 32 likes Picking up post #104: that is the part I would want checked first. Tandem mass spectrometry: MS/MS fragments the molecular ion and uses fragment masses to confirm…
Coming back to: Time to steady state after a dose increase Started this topic · Pharmacology › Pharmacokinetics · 11 Feb 2026 · 0 likes Time to steady state after a dose increase Writing it up because I had to work it out twice and would rather nobody else did. Posting the method first, because I know…
Analytical identity of BPC-157: a 15-mer with a simple mass — does this still hold? Replied, post #6 · Compounds › Repair & healing peptides · 27 Jan 2026 · 14 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…
Second pass at: Pregnancy and pregnancy planning: contraindication and washout Replied, post #103 · Clinical › Special populations · 26 Jan 2026 · 0 likes This follows post #100 rather than contradicting it. Hypoglycemia risk: in people already on insulin or sulfonylureas, adding a GLP-1 agonist requires insulin dose…
Constipation management, with a dietitian's contribution Replied, post #22 · Practice › Side effects · 23 Jan 2026 · 15 likes I read post #20 twice before replying, because I had assumed the opposite. Pancreatitis: a rare but serious event with a specific presentation (epigastric pain, back…
Aggregates and why a purity assay may miss them entirely Replied, post #59 · Analytics › Impurities & related substances · 8 Jan 2026 · 24 likes post #58 answers the question as asked. The question underneath it is different. Deletion sequences (incomplete coupling during synthesis): lower in mass by one…
A single out-of-range value on an otherwise normal panel Replied, post #3 · Clinical › Bloodwork · 4 Jan 2026 · 3 likes This follows post #2 rather than contradicting it. Liver enzymes: elevation does not specify cause. ALT and AST can rise from many things. Bilirubin helps narrow down…
Pharmaceutical compounding rules, summarised from primary sources — a second dataset Replied, post #57 · Sourcing › Regulatory · 30 Nov 2025 · 0 likes Import restrictions vary by compound and by jurisdiction: what is a controlled substance in one place is legal to purchase in another. What you can import for personal…
Can a home kit substitute for a laboratory report? A careful no Replied, post #61 · Analytics › Home & field testing · 23 Nov 2025 · 4 likes What physical quantity does the device measure? A colorimetric or lateral-flow method typically responds to a class of chemistry rather than to a specific molecule. It…
DXA precision and the least significant change for lean mass Replied, post #10 · Outcomes › Body composition · 20 Nov 2025 · 0 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…
Citation sweep results: how many references did not say what was claimed Replied, post #3 · Meta › Wiki maintenance · 3 Nov 2025 · 1 like post #2 is right about the mechanism and I think understates the practical bit. Orphaned pages: if a page has no incoming links and is not reachable from navigation, it…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #108 · Start Here › Welcome · 22 Oct 2025 · 6 likes On post #104 — agreed on the reasoning, with one qualification. There is no stupid-questions rule and no penalty for asking badly. The response to a poorly framed…
What pooling buys you and what it destroys Replied, post #43 · Evidence › Meta-analyses · 15 Oct 2025 · 9 likes Why forest plots are more informative than pooled numbers: they show the variation across studies, which tells you whether the effect is consistent or heterogeneous. A…
[2026 update] Does dual agonism explain the effect size, or is it dose? Replied, post #39 · Compounds › Tirzepatide · 8 Oct 2025 · 25 likes Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply achieving higher receptor engagement? The honest answer is that…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #37 · Analytics › COA interpretation · 17 Sep 2025 · 3 likes post #36 answers the question as asked. The question underneath it is different. Sterility testing is separate: chromatographic purity, mass spectrometry, and endotoxin…
Pinch or no pinch, and how needle length changes the answer Replied, post #57 · Practice › Administration · 11 Sep 2025 · 4 likes Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the stinging sensation substantially. This is the simplest thing to try…
Which panel is worth repeating and which is worth ignoring Replied, post #108 · Clinical › Bloodwork · 11 Sep 2025 · 3 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…
The nausea timeline across the first four weeks, with a tabulated log Replied, post #12 · Practice › Side effects · 23 Aug 2025 · 22 likes I read post #10 twice before replying, because I had assumed the opposite. Pancreatitis: a rare but serious event with a specific presentation (epigastric pain, back…
What this community means by "a source", in practical terms Replied, post #77 · Start Here › Welcome · 19 Aug 2025 · 6 likes On post #73 — agreed on the reasoning, with one qualification. There is no stupid-questions rule and no penalty for asking badly. The response to a poorly framed…
Coming back to: Resolution and tailing factor: real acceptance criteria Replied, post #39 · Analytics › HPLC & UHPLC · 17 Aug 2025 · 2 likes On post #35 — agreed on the reasoning, with one qualification. Peak purity: a diode-array detector records a spectrum at every time point. If a peak contains two…
Temperature loggers worth the money — the long version Replied, post #10 · Devices › Cold chain · 11 Jul 2025 · 16 likes I read post #8 twice before replying, because I had assumed the opposite. Freeze-thaw: some peptides tolerate freezing; others do not. Check your compound's labelling.…
Reconstituting a multi-strength kit without mixing yourself up Replied, post #95 · Practice › Reconstitution · 4 Jul 2025 · 24 likes A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL gives 5 mg/mL, 4 mL gives roughly 2.5 mg/mL. The arithmetic is the same; the…
Revisiting: GLP-1 receptor distribution: central and peripheral Replied, post #8 · Pharmacology › Receptor biology · 19 Jun 2025 · 0 likes post #7 answers the question as asked. The question underneath it is different. Pharmacological class effects: all GLP-1 agonists slow gastric emptying and suppress…
A ten-fold dose error caught before injection Replied, post #51 · Devices › Syringes & needles · 18 Jun 2025 · 23 likes Aspirating before injection: for subcutaneous injection, aspirating (pulling back on the plunger to check for blood) is not necessary and is sometimes discouraged…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #100 · Nutrition & Training › Protein & intake · 16 Jun 2025 · 16 likes Protein sources: animal sources (meat, fish, eggs, dairy) are denser and easier to hit targets with. Plant sources require higher volume. Neither is nutritionally…
[2026 update] An appeal that failed, and what I would do differently Replied, post #99 · Access › Insurance & coverage · 13 Jun 2025 · 9 likes Appeals process: unemotional prose, the criterion quoted verbatim, evidence mapped to it point by point, dates, and nothing else. Describing how the decision affected…
Coming back to: Getting a referral rather than a refusal Replied, post #45 · Clinical › Prescriber conversations · 8 Jun 2025 · 3 likes post #44 answers the question as asked. The question underneath it is different. Questions about dose: asking "how will we determine whether this dose is working for…
Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #16 · Data & Tools › Calculators · 2 Jun 2025 · 31 likes Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.
A well-designed study with a badly written abstract Replied, post #115 · Evidence › Study critique · 29 May 2025 · 11 likes What makes a methodological criticism substantive: it identifies a specific feature of the design that materially affects what the paper can conclude. "Small sample…
Reconstituting a multi-strength kit without mixing yourself up Replied, post #76 · Practice › Reconstitution · 25 May 2025 · 25 likes Osmolarity and reconstitution: the osmolarity of the reconstituted solution affects comfort on injection. Isotonic solutions (close to blood osmolarity) are less…
DXA precision and the least significant change for lean mass — the long version Replied, post #87 · Outcomes › Body composition · 24 May 2025 · 27 likes post #86 is right about the mechanism and I think understates the practical bit. DXA (dual-energy X-ray absorptiometry): the standard for body composition in research.…
Second pass at: Reading a combination trial: attributing effect to components Replied, post #19 · Compounds › Cagrilintide & amylin analogues · 23 May 2025 · 0 likes This follows post #16 rather than contradicting it. Historical amylin analogues: pramlintide was the only long-acting amylin analogue licensed for some time and its…
DXA precision and the least significant change for lean mass — the long version Replied, post #62 · Outcomes › Body composition · 19 May 2025 · 30 likes On post #58 — agreed on the reasoning, with one qualification. DXA (dual-energy X-ray absorptiometry): the standard for body composition in research. Precision is…
Why a pen's dose steps are fixed and what that costs you — one year on Replied, post #14 · Devices › Pens & autoinjectors · 16 May 2025 · 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.
Cost per milligram, computed honestly across formats — the long version Replied, post #84 · Access › Pricing · 1 May 2025 · 3 likes post #83 answers the question as asked. The question underneath it is different. Insurance tier placement: a compound might be covered but on a higher tier (higher…
Carryover and the ghost peak from last week's standard Replied, post #91 · Analytics › HPLC & UHPLC · 12 Apr 2025 · 11 likes On post #87 — agreed on the reasoning, with one qualification. Gradient slope is the single biggest driver of apparent purity differences. A shallower gradient over a…
Carryover and the ghost peak from last week's standard Replied, post #72 · Analytics › HPLC & UHPLC · 10 Apr 2025 · 13 likes This follows post #69 rather than contradicting it. Area percent is not mass percent. It is a proportion of absorbance, weighted by each species' extinction…
Retatrutide dose escalation in the published trials Replied, post #86 · Compounds › Retatrutide · 4 Apr 2025 · 8 likes Dose escalation in the published trials: the protocols started at lower doses and escalated by defined steps. The step sizes are documented and they may or may not…
Counter-ion form: the field almost nobody reports — one year on Replied, post #134 · Analytics › COA interpretation · 28 Mar 2025 · 2 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…
A certificate with no method stated: what can you conclude? Started this topic · Analytics › COA interpretation · 27 Mar 2025 · 7 likes A certificate with no method stated: what can you conclude? I have a specific reason for asking rather than idle curiosity, and the context is below. I would like to…
Follow-up: What other technical communities get right that we do not Replied, post #41 · Lounge › Off topic · 16 Mar 2025 · 20 likes Coming back to post #39, because the follow-up matters more than the original answer. Community norms: if you want to discuss how the community should work (not…
When to suspect the method rather than the sample Replied, post #93 · Analytics › Method validation · 7 Mar 2025 · 28 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…
Second pass at: A single out-of-range value on an otherwise normal panel Replied, post #7 · Clinical › Bloodwork · 22 Feb 2025 · 29 likes Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated…
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — what changed since Replied, post #14 · Practice › Reconstitution · 9 Feb 2025 · 0 likes post #13 answers the question as asked. The question underneath it is different. Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5…
Protein density versus volume when you cannot eat much Replied, post #38 · Nutrition & Training › Protein & intake · 30 Jan 2025 · 5 likes I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #68 · Compounds › Semaglutide · 1 Jan 2025 · 0 likes Semaglutide versus liraglutide in STEP 8: semaglutide produced greater weight reduction and the discontinuation rates differed. But the trial was open-label for the…
[2026 update] Step therapy requirements and how to satisfy them Replied, post #82 · Access › Insurance & coverage · 22 Dec 2024 · 0 likes This follows post #79 rather than contradicting it. Out-of-pocket costs: if insurance is not covering it, asking about patient assistance programmes run by…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #22 · Compounds › Semaglutide · 19 Dec 2024 · 23 likes 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…
Meeting a protein target on a suppressed appetite — does this still hold? Replied, post #56 · Nutrition & Training › Protein & intake · 14 Dec 2024 · 4 likes post #55 answers the question as asked. The question underneath it is different. Protein supplements: whey, casein, and plant-based protein powders can help hit targets…
Time to steady state after a dose increase Replied, post #63 · Pharmacology › Pharmacokinetics · 4 Nov 2024 · 29 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.…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #105 · Analytics › COA interpretation · 3 Nov 2024 · 2 likes Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not automatically a problem but it is worth noting. Fresh…
Anaesthesia and elective surgery: the aspiration question — does this still hold? Replied, post #6 · Practice › Interactions · 29 Oct 2024 · 3 likes Oral medications versus time: if you take an oral medication 30 minutes before semaglutide (which slows gastric emptying), the delayed stomach emptying affects when and…
How to ask for a dose change without antagonising anyone — what changed since Replied, post #13 · Clinical › Prescriber conversations · 28 Oct 2024 · 0 likes Clarifying indication: if a compound is approved for diabetes but you have obesity without diabetes, clarify whether your clinician considers this off-label use and…
Levothyroxine timing: a real interaction with a simple fix Replied, post #3 · Practice › Interactions · 16 Oct 2024 · 0 likes Sulfonylureas and meglitinides: these agents stimulate insulin release and carry hypoglycemia risk. Combining them with semaglutide or tirzepatide requires dose…
Second pass at: Hoarding and why it makes a shortage worse Replied, post #109 · Access › Shortages · 13 Oct 2024 · 16 likes post #108 answers the question as asked. The question underneath it is different. Supply interruptions: official shortage notices are published by regulatory agencies.…
Promotion criteria, and the one that stops most nominations Replied, post #73 · Documentation › Doc review · 29 Sep 2024 · 0 likes This follows post #70 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #24 · Sourcing › Independent verification · 29 Aug 2024 · 0 likes Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks by mail; VendorInvestigate documentation review is…
Circumference measurements as a poor man's composition estimate Replied, post #52 · Outcomes › Body composition · 9 Aug 2024 · 4 likes Precision versus accuracy: the precision you need depends on what question you are answering. "Am I losing fat?" requires less precision than "Is my lean mass…