j.fonseca

TL2 Moderator · Malmö

Contributes reviews on supplier material. Based in Malmö.

Joined 25 April 2025 · last posted 3d

85 posts, newest first. Showing up to 150.

Request: tag synonyms surfaced in search Replied, post #26 · Meta › Feature requests · 25 Jul 2026 · 7 likes Worth separating two things that post #22 runs together. Alternatives: if you have thought of a way the current site might already serve your need, mention it. It helps…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #115 · Evidence › Journal club · 25 Jul 2026 · 5 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…
Talking to a therapist about this specifically Replied, post #22 · Wellbeing › Mental health · 18 Jul 2026 · 5 likes I read post #20 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #103 · Compounds › Semaglutide · 17 Jul 2026 · 13 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.
What a reversed-phase purity number actually is Replied, post #60 · Analytics › HPLC & UHPLC · 16 Jul 2026 · 0 likes Reversed-phase separates on hydrophobicity. A peptide is retained on a non-polar stationary phase and eluted by increasing organic solvent. For peptides the mobile…
What to bring: records that a clinician can actually use — a second dataset Replied, post #21 · Clinical › Prescriber conversations · 10 Jul 2026 · 4 likes How to ask for what you need: rather than "should I take this", frame it as "I understand the evidence for this shows X benefit in people with my condition; would it be…
Ultrasound and skinfolds: operator dependence in practice Replied, post #44 · Outcomes › Body composition · 5 Jul 2026 · 9 likes This follows post #41 rather than contradicting it. Visceral fat: DXA does not distinguish visceral (organ-associated) fat from subcutaneous fat. That distinction might…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #61 · Practice › Administration · 26 Jun 2026 · 22 likes Air bubbles in a subcutaneous injection: the honest risk assessment is low. Tiny air bubbles in subcutaneous tissue do not behave like an air embolism in a blood…
Journal club: SELECT, absolute risk, and how it was reported Replied, post #3 · Evidence › Journal club · 23 Jun 2026 · 1 like I read the opening post twice before replying, because I had assumed the opposite. PIONEER 6 (N Engl J Med 2019): Cardiovascular safety trial for oral semaglutide, not…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #66 · Sourcing › Red flags · 19 Jun 2026 · 0 likes This follows post #63 rather than contradicting it. Unresponsiveness: a supplier that does not reply to reasonable requests for documentation or clarification is…
Does dual agonism explain the effect size, or is it dose? Replied, post #43 · Compounds › Tirzepatide · 18 Jun 2026 · 8 likes Worth separating two things that post #39 runs together. Dual agonism versus dose: how much of tirzepatide's effect is the GIP component and how much is simply…
Why we ask for units every single time, with three examples of what goes wrong Replied, post #16 · Start Here › How to Ask · 3 Jun 2026 · 4 likes Disagreeing with an answer you got: cite what you disagree with, say what contradicts it, and ask which one holds. Do not open with "I think you are wrong". Lead with…
Follow-up: The most useful thing you learned here that was not the answer you came for Started this topic · Lounge › Off topic · 30 May 2026 · 54 likes On the subject in the title: The most useful thing you learned here that was not the answer you came for Working notes rather than a conclusion. Lower-stakes topic, but…
Comparing prices across jurisdictions without misleading yourself Replied, post #8 · Access › Pricing · 26 May 2026 · 5 likes post #7 is right about the mechanism and I think understates the practical bit. Price variation between pharmacies: identical prescriptions can cost different amounts…
Tesamorelin has an approved indication — what that changes about the evidence Replied, post #6 · Compounds › Secretagogues & GH axis · 8 May 2026 · 30 likes Pulsatile secretion matters because growth hormone is secreted in pulses, not continuously. A single post-dose growth hormone level is nearly uninterpretable. Assessing…
The anatomy of a question that gets answered within an hour Replied, post #35 · Start Here › How to Ask · 3 May 2026 · 0 likes What you have already read matters. Saying "I read the maintained page on this and I still have a gap" tells people they do not need to point you at the same resource…
The best-written scientific paper you have read Replied, post #23 · Lounge › Off topic · 29 Apr 2026 · 0 likes I read post #21 twice before replying, because I had assumed the opposite. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write…
Stability of BPC-157 in solution: what has been measured — one year on Replied, post #45 · Compounds › Repair & healing peptides · 29 Apr 2026 · 2 likes BPC-157: the preclinical literature is extensive, mostly from a small number of research groups, and reports effects across a wide range of injury models. The breadth…
Type 2 diabetes and the largest part of the evidence base Replied, post #87 · Clinical › Comorbidities · 29 Apr 2026 · 0 likes Picking up post #84: that is the part I would want checked first. PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with obesity and insulin…
Pre-registering a personal experiment, seriously — a second dataset Replied, post #61 · Research Methods › N-of-1 designs · 27 Apr 2026 · 9 likes This follows post #58 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Journal club: STEP 8 and the fairness of the comparator dose — a second dataset Replied, post #6 · Evidence › Journal club · 20 Apr 2026 · 22 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #17 · Clinical › Comorbidities · 16 Apr 2026 · 4 likes post #16 answers the question as asked. The question underneath it is different. Obstructive sleep apnoea: SURMOUNT-OSA used an objective endpoint, the apnoea-hypopnoea…
Personal import allowances, compared — a second dataset Replied, post #102 · Access › International · 11 Apr 2026 · 5 likes Licensed prescribing: where a compound is approved, prescribing is restricted to licensed prescribers. Where it is not approved, the legality of possession and use is…
Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Started this topic · Analytics › Home & field testing · 10 Apr 2026 · 13 likes On the subject in the title: Lateral-flow and colorimetric approaches: the specificity problem Working notes rather than a conclusion. I would like to understand what…
Spike-and-recover accuracy for a peptide assay Replied, post #80 · Analytics › Method validation · 9 Apr 2026 · 0 likes Stability-indicating method: one that can separate a compound from its degradation products. Critical for assay methods that claim to measure actual degradation (as…
Follow-up: State-level differences that actually matter Replied, post #75 · Regional › North America · 8 Apr 2026 · 5 likes post #74 is right about the mechanism and I think understates the practical bit. Regional variation in North America: access differs substantially by US state and…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #57 · Compounds › Tirzepatide · 25 Mar 2026 · 8 likes Titration schedules for tirzepatide have more dose steps than semaglutide partly because the compound is more potent and partly because the clinical programme used a…
Fasting versus non-fasting and which tests care Started this topic · Clinical › Bloodwork · 16 Mar 2026 · 21 likes Fasting versus non-fasting and which tests care Writing it up because I had to work it out twice and would rather nobody else did. General question, not a request for…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #33 · Practice › Reconstitution · 6 Mar 2026 · 1 like post #32 answers the question as asked. The question underneath it is different. A 10 mg vial reconstituted three different ways: 1 mL diluent gives 10 mg/mL, 2 mL…
Contributing data without breaching anyone's privacy Replied, post #13 · Data & Tools › Datasets · 3 Mar 2026 · 0 likes Collection methods: ask how the data were collected. Longitudinal tracking over months is stronger than retrospective recall. Prospective measurement (done while…
Mass error in ppm: the arithmetic and the caveat Replied, post #55 · Analytics › Mass spectrometry · 13 Feb 2026 · 0 likes Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you expect mostly 2+, 3+, and 4+ charge states. Reading an electrospray spectrum means…
Preprint servers and what screening they do Replied, post #53 · Evidence › Preprints · 12 Feb 2026 · 0 likes post #52 is right about the mechanism and I think understates the practical bit. Discussing preprints in this community: bring them in for early discussion, label them…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #98 · Access › International · 8 Feb 2026 · 7 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…
Realistic expectations for strength while losing weight quickly Replied, post #57 · Nutrition & Training › Resistance training · 27 Jan 2026 · 0 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…
Muscle cramps: the ordinary causes before the exotic ones Replied, post #84 · Practice › Side effects · 20 Jan 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…
[2026 update] Availability by country, dated, with primary sources Replied, post #11 · Access › International · 11 Jan 2026 · 0 likes Licensed prescribing: where a compound is approved, prescribing is restricted to licensed prescribers. Where it is not approved, the legality of possession and use is…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #47 · Practice › Side effects · 7 Jan 2026 · 8 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…
Can a home kit substitute for a laboratory report? A careful no Replied, post #96 · Analytics › Home & field testing · 3 Jan 2026 · 12 likes post #95 answers the question as asked. The question underneath it is different. Why third-party testing is stronger: a home test run by the person who made the…
Heterogeneity as information rather than as a nuisance Replied, post #44 · Evidence › Meta-analyses · 31 Dec 2025 · 24 likes Publication bias: what did not get published? Small studies with negative results are less likely to be published than large studies with positive results. A forest…
Journal club: STEP 3 and the intensive behavioural therapy floor Replied, post #3 · Evidence › Journal club · 25 Dec 2025 · 2 likes SELECT (N Engl J Med 2023): Semaglutide cardiovascular outcomes without diabetes. The first outcome trial in people without diabetes, which decoupled the cardiovascular…
Aggregates and why a purity assay may miss them entirely Replied, post #17 · Analytics › Impurities & related substances · 19 Dec 2025 · 1 like Residual solvents: traces of solvents used in purification. These are usually tested by gas chromatography, not by HPLC. A specification for residual solvents should be…
A parcel that arrived warm: a decision process, not a verdict Replied, post #99 · Practice › Storage & stability · 23 Oct 2025 · 18 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…
Follow-up: Why appetite effects are mostly central Replied, post #74 · Pharmacology › Receptor biology · 22 Oct 2025 · 14 likes Long-term receptor changes: very little is known about what happens to receptor expression, signalling, and downstream effects over years of exposure to these…
AOD-9604 and the fragment hypothesis, revisited Replied, post #19 · Compounds › Other compounds · 6 Oct 2025 · 0 likes Why catalogue breadth is not evidence of anything: a supplier listing 500 compounds does not make the 450 untested ones likely to work. It makes them untested compounds…
Comparing two chromatograms from different laboratories, properly Replied, post #11 · Analytics › HPLC & UHPLC · 15 Sep 2025 · 2 likes Method validation is the demonstration that a method can separate the compound from its degradation products and impurities reliably. A method that cannot resolve an…
High-resolution MS on aggregates and what it can see Replied, post #48 · Analytics › Mass spectrometry · 20 Aug 2025 · 1 like Coming back to post #46, because the follow-up matters more than the original answer. Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #106 · Compounds › Repair & healing peptides · 18 Aug 2025 · 4 likes TB-500 is usually the 7-residue actin-binding fragment of thymosin beta-4, not the full 43-residue protein. The two are routinely conflated in supplier documentation…
Liver enzymes drifting down and what that usually means Replied, post #3 · Clinical › Bloodwork · 5 Aug 2025 · 0 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…
Revisiting: German, French and Dutch differences, compared Replied, post #47 · Regional › European Union · 19 Jul 2025 · 1 like Pharmacy practice: pharmacies in different EU countries differ in conservatism about irregular prescriptions. Some will decline a prescription they consider irregular;…
Sodium, potassium and magnesium when intake drops Replied, post #62 · Nutrition & Training › Hydration & electrolytes · 16 Jul 2025 · 4 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…
Realistic expectations for strength while losing weight quickly Replied, post #7 · Nutrition & Training › Resistance training · 12 Jul 2025 · 13 likes Frequency: three sessions per week of full-body training is easier to maintain than higher frequencies on an energy deficit. Consistency beats intensity when recovery…
Validating a calculator against hand arithmetic — what changed since Replied, post #115 · Data & Tools › Calculators · 5 Jun 2025 · 0 likes This follows post #112 rather than contradicting it. Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors that come from…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #113 · Practice › Interactions · 3 Jun 2025 · 32 likes Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries hypoglycemia risk if insulin doses are not adjusted.…
Cost per milligram, computed honestly across formats — the long version Replied, post #123 · Access › Pricing · 2 Jun 2025 · 14 likes post #122 is right about the mechanism and I think understates the practical bit. Pharmacy acquisition cost: a pharmacy pays less than the patient pays, even at…
Reconciling a label claim with a content assay Started this topic · Analytics › COA interpretation · 28 May 2025 · 1 like On the subject in the title: Reconciling a label claim with a content assay Working notes rather than a conclusion. I would like to understand what this number means…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #4 · Compounds › Semaglutide · 17 May 2025 · 1 like Worth separating two things that the opening post runs together. The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below…
Coming back to: What published stability data actually covers, and what it does not Replied, post #34 · Practice › Storage & stability · 4 May 2025 · 5 likes Coming back to post #32, because the follow-up matters more than the original answer. I want to gently push back on the reply above about storage extrapolation. The…
Talking to a therapist about this specifically — does this still hold? Replied, post #51 · Wellbeing › Mental health · 26 Apr 2025 · 0 likes Sleep and mental health: these compounds can affect sleep for some people. Sleep deprivation worsens mood and anxiety. Addressing sleep separately from mood matters.
The report format the maintainers ask for, and why each field is there — what changed… Replied, post #23 · Sourcing › Vendor reports · 24 Apr 2025 · 22 likes I read post #21 twice before replying, because I had assumed the opposite. Disputed records: when a result disagreed and was not explained, the record says disputed and…
Coming back to: An 18-month record including the parts that went badly Replied, post #42 · Outcomes › Progress reports · 21 Apr 2025 · 23 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…
Excipient function in a licensed injectable — the long version Replied, post #2 · Pharmacology › Formulation chemistry · 17 Apr 2025 · 11 likes Preservatives: solutions for multi-dose vials contain preservatives (benzyl alcohol, phenol, or others) to inhibit microbial growth after the vial has been entered.…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #16 · Evidence › Journal club · 17 Apr 2025 · 0 likes post #15 is right about the mechanism and I think understates the practical bit. SELECT (N Engl J Med 2023): Semaglutide cardiovascular outcomes without diabetes. The…
Why the timeline is on the right and not the left Replied, post #6 · Meta › Site feedback · 7 Apr 2025 · 14 likes Display issues: broken layouts, images not loading, text overlapping — report with the browser and device you were using. Display bugs are platform-specific.
Retatrutide dose escalation in the published trials Replied, post #71 · Compounds › Retatrutide · 31 Mar 2025 · 0 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…
A promotion I argued against, and why I lost Replied, post #130 · Documentation › Doc review · 12 Mar 2025 · 27 likes This follows post #127 rather than contradicting it. Review date disputes: if a maintained page's review date is approaching and it has not been updated, post a note so…
Cost per milligram, computed honestly across formats — the long version Replied, post #11 · Access › Pricing · 16 Feb 2025 · 0 likes post #10 is right about the mechanism and I think understates the practical bit. Insurance tier placement: a compound might be covered but on a higher tier (higher…
Isotope patterns and why the monoisotopic peak is not the tallest Replied, post #14 · Analytics › Mass spectrometry · 6 Feb 2025 · 3 likes Worth separating two things that post #10 runs together. Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #45 · Analytics › COA interpretation · 23 Jan 2025 · 5 likes When method identifiers are missing: "reversed-phase HPLC" is less specific than "reversed-phase HPLC at 214 nm on a C18 column with a 10 to 40% acetonitrile gradient…
Canadian access and provincial variation Replied, post #8 · Regional › North America · 21 Jan 2025 · 0 likes I read post #6 twice before replying, because I had assumed the opposite. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so…
Escalating every six weeks instead of four: what I observed over eight months Replied, post #9 · Practice › Dosing & titration · 6 Jan 2025 · 5 likes Holding a dose indefinitely: the trials did not study indefinite holding at a non-maximum dose. The trials escalated to a target and then held that. What happens if you…
TB-500 and thymosin beta-4: the fragment versus the protein — does this still hold? Replied, post #23 · Compounds › Repair & healing peptides · 24 Dec 2024 · 13 likes What would change the position on repair peptides: adequately powered, published, peer-reviewed randomised controlled human trials with pre-specified outcomes. That is…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #54 · Compounds › Semaglutide · 22 Dec 2024 · 0 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…
Washout with a one-week half-life: the arithmetic Replied, post #61 · Research Methods › N-of-1 designs · 3 Dec 2024 · 0 likes I read post #59 twice before replying, because I had assumed the opposite. Blinding: blinding yourself (not knowing which condition you are in) removes expectation…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #128 · Compounds › Repair & healing peptides · 23 Nov 2024 · 29 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.
Reading a supplementary appendix and finding the interesting part Replied, post #27 · Evidence › Trials · 20 Nov 2024 · 17 likes The estimand: what the trial set out to estimate. Two trials can be identical in structure but estimate different things by using different handling rules for people…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #40 · Compounds › Repair & healing peptides · 12 Nov 2024 · 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.
Follow-up: Recovery when intake is low: what to cut first Replied, post #9 · Nutrition & Training › Resistance training · 6 Nov 2024 · 0 likes Cardio and resistance: the interaction between energy-intense cardiovascular training and resistance training is real. Moderate cardio is fine; excessive endurance…
A revision dispute resolved on the topic rather than in the history — a second dataset Replied, post #26 · Meta › Wiki maintenance · 4 Nov 2024 · 6 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…
The topic list is dense — is that deliberate? Replied, post #46 · Meta › Site feedback · 1 Nov 2024 · 2 likes Search and findability: if you searched for something and did not find it, report what you searched for and what you expected to find. That helps improve indexing and…
Second pass at: Food noise reducing and the disorientation that can follow Replied, post #60 · Wellbeing › Mental health · 31 Oct 2024 · 8 likes I read post #58 twice before replying, because I had assumed the opposite. Mood and anxiety: mood changes and anxiety are reported by some people. Baseline mental…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #15 · Compounds › Other compounds · 24 Sep 2024 · 2 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…
Orforglipron as a non-peptide: what changes when the molecule is small Replied, post #17 · Compounds › Oral incretins · 29 Aug 2024 · 1 like Dose numbers for oral formulations are not comparable to injectable ones. The 14 mg oral dose is not equivalent to any injectable dose in the traditional comparison…
Coming back to: Preparing for an appointment: one page, three questions Replied, post #38 · Clinical › Prescriber conversations · 15 Aug 2024 · 11 likes This follows post #35 rather than contradicting it. Preparing for an appointment: bring recent bloodwork, a list of current medications with doses and timing, and any…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #7 · Analytics › Method validation · 26 Jul 2024 · 22 likes Robustness: the method gives consistent results when minor parameters vary. Tested by deliberately varying pH, temperature, flow rate, and mobile phase composition…
Where the four-week escalation interval comes from, and what it is not Replied, post #45 · Practice › Dosing & titration · 11 Jul 2024 · 20 likes Titrating on tolerability rather than on the calendar: some people escalate when they tolerate a dose well, others escalate on the prescribed schedule regardless. The…