j.fonseca

TL2 · 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. I would use that constantly. The objection is presumably that it is data the site then has to hold and protect…
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #115 · Evidence › Journal club · 25 Jul 2026 · 5 likes Reading rather than contributing, but this is the most useful thread I have found on it.
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. The social side of this — how other people respond to visible change — comes up constantly…
Molecular mass of semaglutide and why the figure differs between sources Replied, post #103 · Compounds › Semaglutide · 17 Jul 2026 · 13 likes Semaglutide's structure is a modified backbone with a C18 diacid attached through a spacer. The acylation is the reason for the long half-life and it is also the reason…
What a reversed-phase purity number actually is Replied, post #60 · Analytics › HPLC & UHPLC · 16 Jul 2026 · 0 likes Reversed-phase purity number came up in a thread eighteen months ago and was answered well. I cannot find it, which is itself the problem, so here is the reconstruction.
What to bring: records that a clinician can actually use — a second dataset Replied, post #21 · Clinical › Prescriber conversations · 10 Jul 2026 · 4 likes Thank you for the correction. I would rather find out here than later.
Ultrasound and skinfolds: operator dependence in practice Replied, post #44 · Outcomes › Body composition · 5 Jul 2026 · 9 likes Post #41 is the version of this I will quote in future. One addition. Percentage body fat is a ratio, so it changes when either component changes. A rising percentage…
Completing a dose with a second syringe, and the dead-volume arithmetic Replied, post #61 · Practice › Administration · 26 Jun 2026 · 22 likes Air in the syringe is a much smaller problem subcutaneously than the anxiety about it suggests, and it is still worth expelling because the bubble occupies volume you…
Journal club: SELECT, absolute risk, and how it was reported Replied, post #3 · Evidence › Journal club · 23 Jun 2026 · 1 like Coming back to the opening post, because the follow-up matters more than the original answer. Critical appraisal template: (1) What did the trial set out to estimate?…
A supplier who responds to a discrepancy with silence — what changed since Replied, post #66 · Sourcing › Red flags · 19 Jun 2026 · 0 likes Building on post #63 rather than restating it. Supplier is one of those subjects where the general answer and the answer for a specific case diverge, and the thread…
Does dual agonism explain the effect size, or is it dose? Replied, post #43 · Compounds › Tirzepatide · 18 Jun 2026 · 8 likes I read post #39 twice before replying, because I had assumed the opposite. Dual agonism: I have looked for the primary source twice and failed twice. Either it does not…
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 A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either. I would want a second opinion before…
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. A digression I have…
Comparing prices across jurisdictions without misleading yourself Replied, post #8 · Access › Pricing · 26 May 2026 · 5 likes Confirming post #6 from a second method, which matters more than confirming it from a second person. Prices in old topics are historical records and are frequently…
Tesamorelin has an approved indication — what that changes about the evidence Replied, post #6 · Compounds › Secretagogues & GH axis · 8 May 2026 · 30 likes An observation about tesamorelin that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than private.
The anatomy of a question that gets answered within an hour Replied, post #35 · Start Here › How to Ask · 3 May 2026 · 0 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either. The conclusion is tentative; the…
The best-written scientific paper you have read Replied, post #23 · Lounge › Off topic · 29 Apr 2026 · 0 likes What I can speak to on best-written scientific paper is narrow, so I will keep it narrow rather than generalising from it. Beyond that boundary I do not know.
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 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…
Type 2 diabetes and the largest part of the evidence base Replied, post #87 · Clinical › Comorbidities · 29 Apr 2026 · 0 likes Confirming post #84 from a second method, which matters more than confirming it from a second person. My position on type 2 diabetes is current rather than settled. I…
Pre-registering a personal experiment, seriously — a second dataset Replied, post #61 · Research Methods › N-of-1 designs · 27 Apr 2026 · 9 likes The arithmetic in post #59 is right; the assumption feeding it is the part to check. An update on my earlier Pre-registering a personal experiment post: the pattern…
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 I have no financial interest in anything named in this thread and I want to say so before I comment on STEP 8, because it is the sort of subject where it matters.
Revisiting: PCOS and metabolic overlap: what is and is not studied Replied, post #17 · Clinical › Comorbidities · 16 Apr 2026 · 4 likes Narrowing post #15, because the general version has more than one answer. On PCOS and metabolic overlap I would separate what is worth knowing from what is worth acting…
Personal import allowances, compared — a second dataset Replied, post #102 · Access › International · 11 Apr 2026 · 5 likes Regulatory position dates: a regulatory position is only current as of when it was written. Rechecking is prudent, especially if you saw it months ago.
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. Lateral-flow and colorimetric…
Spike-and-recover accuracy for a peptide assay Replied, post #80 · Analytics › Method validation · 9 Apr 2026 · 0 likes The limit of quantitation determines what the impurity table can honestly contain. Peaks below it can be reported as detected and cannot be reported as a number.
Follow-up: State-level differences that actually matter Replied, post #75 · Regional › North America · 8 Apr 2026 · 5 likes Building on post #74 rather than restating it. Emotional language in an appeal does not help, however justified it is. The reviewer is checking criteria and the job is…
The 2.5 mg starting dose is not a therapeutic dose — why that matters Replied, post #57 · Compounds › Tirzepatide · 25 Mar 2026 · 8 likes The 2.5 mg starting dose is not a therapeutic dose in the sense that weight loss is minimal at that dose. It is a tolerance-testing dose. Confusing the purpose of 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. Fasting versus non-fasting: what I…
Second pass at: Choosing a concentration on purpose rather than by accident Replied, post #33 · Practice › Reconstitution · 6 Mar 2026 · 1 like Confirming post #32 from a second method, which matters more than confirming it from a second person. I disagree with the framing of Choosing a concentration above, and…
Contributing data without breaching anyone's privacy Replied, post #13 · Data & Tools › Datasets · 3 Mar 2026 · 0 likes Include the denominator. A collection of reports without knowing how many people did not report is uninterpretable in the direction everybody wants to interpret it.
Mass error in ppm: the arithmetic and the caveat Replied, post #55 · Analytics › Mass spectrometry · 13 Feb 2026 · 0 likes An acylated peptide has a mass that reflects the modification, so comparing against the mass of the unmodified backbone gives a mismatch that is not an error.
Preprint servers and what screening they do Replied, post #53 · Evidence › Preprints · 12 Feb 2026 · 0 likes Post #52 is the version of this I will quote in future. One addition. Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes…
Revisiting: Language barriers in accessing a prescription abroad Replied, post #98 · Access › International · 8 Feb 2026 · 7 likes Both are useful and they are different contributions. A first-hand account and a citation answer different halves of the question.
Realistic expectations for strength while losing weight quickly Replied, post #57 · Nutrition & Training › Resistance training · 27 Jan 2026 · 0 likes Clear enough that I do not think I have a follow-up, which is unusual.
Muscle cramps: the ordinary causes before the exotic ones Replied, post #84 · Practice › Side effects · 20 Jan 2026 · 0 likes Noted, and thank you for writing it out rather than summarising it.
[2026 update] Availability by country, dated, with primary sources Replied, post #11 · Access › International · 11 Jan 2026 · 0 likes Travel with medication: carrying a compound across borders is complicated by legal status. Documenting that it is prescribed and carrying proof reduces (but does not…
Distinguishing expected GI effects from something that needs urgent attention Replied, post #47 · Practice › Side effects · 7 Jan 2026 · 8 likes Vomiting: when it is expected (first-dose reactions or early titration) and when it is a reason to stop and seek help are different. Occasional vomiting during…
Can a home kit substitute for a laboratory report? A careful no Replied, post #96 · Analytics › Home & field testing · 3 Jan 2026 · 12 likes The arithmetic in post #95 is right; the assumption feeding it is the part to check. Ultraviolet absorbance at 280 nanometres estimates concentration for peptides…
Heterogeneity as information rather than as a nuisance Replied, post #44 · Evidence › Meta-analyses · 31 Dec 2025 · 24 likes I would keep heterogeneity and the decision it usually gets used for separate in this thread. They are related and they are not the same question, and merging them is…
Journal club: STEP 3 and the intensive behavioural therapy floor Replied, post #3 · Evidence › Journal club · 25 Dec 2025 · 2 likes Distinguishing three things in the STEP 3 discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that gets…
Aggregates and why a purity assay may miss them entirely Replied, post #17 · Analytics › Impurities & related substances · 19 Dec 2025 · 1 like A supplier that can tell you what its principal impurity is has answered a harder question than one that can tell you its purity, and the answer is more useful. That…
A parcel that arrived warm: a decision process, not a verdict Replied, post #99 · Practice › Storage & stability · 23 Oct 2025 · 18 likes Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear. Flagging that the…
Follow-up: Why appetite effects are mostly central Replied, post #74 · Pharmacology › Receptor biology · 22 Oct 2025 · 14 likes Half-life extension by albumin binding through a fatty acid chain trades free fraction for duration. It is an engineering solution with a cost, and the cost is that the…
AOD-9604 and the fragment hypothesis, revisited Replied, post #19 · Compounds › Other compounds · 6 Oct 2025 · 0 likes Distinguishing three things in the AOD-9604 discussion that keep getting used interchangeably: the observation, the proposed mechanism, and the recommendation that gets…
Comparing two chromatograms from different laboratories, properly Replied, post #11 · Analytics › HPLC & UHPLC · 15 Sep 2025 · 2 likes Column chemistry and particle size: smaller particles (1.7 μm) give better resolution and higher efficiency than larger particles (3.5 μm or 5 μm), at the cost of…
High-resolution MS on aggregates and what it can see Replied, post #48 · Analytics › Mass spectrometry · 20 Aug 2025 · 1 like Post #45 and I disagree about the size of the effect, not about the direction. Before the thread moves on from high-resolution — what is the sample size behind the…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #106 · Compounds › Repair & healing peptides · 18 Aug 2025 · 4 likes Oral versus injected administration claims for BPC-157: the preclinical work studied injection. Oral claims are common in supplier marketing and poorly supported by…
Liver enzymes drifting down and what that usually means Replied, post #3 · Clinical › Bloodwork · 5 Aug 2025 · 0 likes One more thing on liver enzymes drifting that took me far too long to see: the two figures people quote are not measuring the same quantity. Once you notice that, the…
Revisiting: German, French and Dutch differences, compared Replied, post #47 · Regional › European Union · 19 Jul 2025 · 1 like Agreed on German, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the…
Sodium, potassium and magnesium when intake drops Replied, post #62 · Nutrition & Training › Hydration & electrolytes · 16 Jul 2025 · 4 likes Something worth flagging about sodium: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and not a…
Realistic expectations for strength while losing weight quickly Replied, post #7 · Nutrition & Training › Resistance training · 12 Jul 2025 · 13 likes Adaptation and plateau: if strength does not change for weeks, that is stability, not backsliding. Expecting continuous progress during weight loss is unrealistic. I…
Validating a calculator against hand arithmetic — what changed since Replied, post #115 · Data & Tools › Calculators · 5 Jun 2025 · 0 likes Taking post #112 at face value and following it one step further. Reconstitution calculator: enter vial mass, final volume target, and the calculator tells you…
Delayed gastric emptying and oral medication absorption: which drugs matter Replied, post #113 · Practice › Interactions · 3 Jun 2025 · 32 likes The most defensible general position in this subcategory: identify the plausible mechanism, check whether it has been studied, and where it has not, say that rather…
Cost per milligram, computed honestly across formats — the long version Replied, post #123 · Access › Pricing · 2 Jun 2025 · 14 likes Adding the measurement that post #121 says would settle it. The most useful pricing posts here are the ones that show the arithmetic rather than the conclusion.
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. The question about reconciling a label claim that I…
Semaglutide versus liraglutide head to head: reading STEP 8 carefully Replied, post #4 · Compounds › Semaglutide · 17 May 2025 · 1 like The opening post describes the usual case. This is about the unusual one. Cardiovascular data in people without diabetes is the specific contribution of SELECT, and it…
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 Post #32 put the caveat in the right place and I want to underline it. The thing about published stability data actually covers that took me longest to accept is that a…
Talking to a therapist about this specifically — does this still hold? Replied, post #51 · Wellbeing › Mental health · 26 Apr 2025 · 0 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…
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 Coming back to post #21, because the follow-up matters more than the original answer. Structured report format: compound, lot, independent testing service, method as…
Coming back to: An 18-month record including the parts that went badly Replied, post #42 · Outcomes › Progress reports · 21 Apr 2025 · 23 likes Non-scale victories: muscle gain or maintenance, clothing fit, energy level, and capability (like climbing stairs without breathlessness) are measurements that…
Excipient function in a licensed injectable — the long version Replied, post #2 · Pharmacology › Formulation chemistry · 17 Apr 2025 · 11 likes The honest summary: a licensed formulation is a designed system and a reconstituted research preparation is not one. Everything published about the first is at best a…
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 #14 is the version of this I will quote in future. One addition. Two sentences on STEP 1 and then I will stop, because the rest is speculation and the thread is…
Why the timeline is on the right and not the left Replied, post #6 · Meta › Site feedback · 7 Apr 2025 · 14 likes Community norms: if you think a norm has drifted or is not being followed consistently, raising it here can prompt discussion and realignment. A modest claim, modestly…
Retatrutide dose escalation in the published trials Replied, post #71 · Compounds › Retatrutide · 31 Mar 2025 · 0 likes What would change my mind on retatrutide dose escalation is a second dataset collected by someone with no stake in the first. Until then I hold it loosely and I would…
A promotion I argued against, and why I lost Replied, post #130 · Documentation › Doc review · 12 Mar 2025 · 27 likes Post #127 is right about the mechanism and I think understates the practical bit. Reviewing your own nomination is fine and is not sufficient. Somebody else has to read…
Cost per milligram, computed honestly across formats — the long version Replied, post #11 · Access › Pricing · 16 Feb 2025 · 0 likes The arithmetic in post #10 is right; the assumption feeding it is the part to check. Cost per week at a maintenance dose is the figure most people actually want and…
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. A methods point on isotope patterns rather than a substantive one: if the comparison is not like for like, the…
Second pass at: Certificates issued by the seller versus by a laboratory Replied, post #45 · Analytics › COA interpretation · 23 Jan 2025 · 5 likes A chromatogram supplied as a small image is legible for peak shape and not for baseline detail. That is enough to sanity-check an integration and not enough to…
Canadian access and provincial variation Replied, post #8 · Regional › North America · 21 Jan 2025 · 0 likes On post #6 — agreed on the reasoning, with one qualification. What would change my mind on canadian access and provincial variation is a second dataset collected by…
Escalating every six weeks instead of four: what I observed over eight months Replied, post #9 · Practice › Dosing & titration · 6 Jan 2025 · 5 likes If you are stepping up mainly because the schedule says so rather than because the current dose has stopped doing what you wanted, that is worth noticing before rather…
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 Reported local reactions are common enough in first-hand accounts here to be worth mentioning and are not characterised in any published series. Not disagreeing with…
Molecular mass of semaglutide and why the figure differs between sources — does this… Replied, post #54 · Compounds › Semaglutide · 22 Dec 2024 · 0 likes Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they stopped at 2.4 mg. Some people report trying higher doses, but…
Washout with a one-week half-life: the arithmetic Replied, post #61 · Research Methods › N-of-1 designs · 3 Dec 2024 · 0 likes On post #60 — agreed on the reasoning, with one qualification. Sample size in n-of-1: you are the sample. Repeated measurements (weekly weighings, daily mood scores)…
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 What would change the position on repair peptides: adequately powered, published, peer-reviewed randomised controlled human trials with pre-specified outcomes. That is…
Reading a supplementary appendix and finding the interesting part Replied, post #27 · Evidence › Trials · 20 Nov 2024 · 17 likes Absolute and relative effects answer different questions. Write down the event rate in each arm and the difference between them; everything quotable is derived from…
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 What would change the position on repair peptides: adequately powered, published, peer-reviewed randomised controlled human trials with pre-specified outcomes. That is…
Follow-up: Recovery when intake is low: what to cut first Replied, post #9 · Nutrition & Training › Resistance training · 6 Nov 2024 · 0 likes The reports here that state the programme, the load and the timeframe are useful. The ones that state an outcome are not. That is a description of practice, not a…
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 Helpful, and short, which on this subject is harder than long.
The topic list is dense — is that deliberate? Replied, post #46 · Meta › Site feedback · 1 Nov 2024 · 2 likes I read the earlier replies on topic list twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said rather…
Second pass at: Food noise reducing and the disorientation that can follow Replied, post #60 · Wellbeing › Mental health · 31 Oct 2024 · 8 likes On post #58 — agreed on the reasoning, with one qualification. If you are in crisis, contact a local emergency or crisis service rather than posting. A volunteer forum…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #15 · Compounds › Other compounds · 24 Sep 2024 · 2 likes Dose conversions between related compounds in this subcategory are made far too casually. Structural similarity does not imply potency similarity and frequently does…
Orforglipron as a non-peptide: what changes when the molecule is small Replied, post #17 · Compounds › Oral incretins · 29 Aug 2024 · 1 like The reason orforglipron is hard to answer is that the obvious measurement and the relevant quantity are not the same thing, and substituting one for the other is silent.
Coming back to: Preparing for an appointment: one page, three questions Replied, post #38 · Clinical › Prescriber conversations · 15 Aug 2024 · 11 likes Picking up post #35: that is the part I would want checked first. A question phrased as "what would you want to see before considering X" is answerable and is not a…
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 Limits of detection and quantitation: LOD is the lowest concentration that produces a signal above background. LOQ is the lowest concentration at which the method meets…
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…