l.ferreira

TL2 Moderator · Uppsala

Contributes reviews on supplier material. Based in Uppsala.

Joined 25 August 2025 · last posted 3d

84 posts, newest first. Showing up to 150.

Which categories are strict and which are relaxed, honestly Replied, post #50 · Start Here › Welcome · 25 Jul 2026 · 0 likes Off-topic posts that do not belong here belong in the Lounge instead. You are not in trouble if a moderator moves your post — they are just routing it to the right…
Does a peptide degrade silently, with no visual change? Replied, post #77 · Practice › Storage & stability · 23 Jul 2026 · 0 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…
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction Replied, post #43 · Compounds › Retatrutide · 22 Jul 2026 · 0 likes I read post #41 twice before replying, because I had assumed the opposite. How to read phase 2 without treating it as phase 3: phase 2 establishes that a dose range…
I joined for one answer and stayed for a year — what changed my mind Replied, post #93 · Start Here › Welcome · 19 Jul 2026 · 3 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…
Seven-day rolling means and why weekly readings mislead Replied, post #23 · Outcomes › Progress reports · 13 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,…
I joined for one answer and stayed for a year — what changed my mind Replied, post #72 · Start Here › Welcome · 10 Jul 2026 · 26 likes Off-topic posts that do not belong here belong in the Lounge instead. You are not in trouble if a moderator moves your post — they are just routing it to the right…
Review: a draft on reconstitution arithmetic, with objections — what changed since Replied, post #37 · Documentation › Doc review · 7 Jul 2026 · 0 likes I read post #35 twice before replying, because I had assumed the opposite. Revision disputes: if you disagree with an edit a maintainer made to a page, discuss it here.…
Why this subcategory is stricter about sourcing than most Replied, post #51 · Compounds › Secretagogues & GH axis · 3 Jul 2026 · 12 likes On post #47 — agreed on the reasoning, with one qualification. Ipamorelin selectivity claims originate in preclinical characterisation and are reasonably well supported…
Second pass at: Sleep apnoea improving and the equipment implications Replied, post #72 · Wellbeing › Sleep · 30 Jun 2026 · 26 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…
What to include when your question involves a chromatogram — one year on Replied, post #55 · Start Here › How to Ask · 28 Jun 2026 · 22 likes On post #51 — agreed on the reasoning, with one qualification. Five questions in one post gets you one answer: the easiest one, usually not the one you needed most.…
Aggregate verification data across the directory, with caveats Replied, post #7 · Sourcing › Independent verification · 21 Jun 2026 · 0 likes PeptideMeter: purity analysis plus structured, dated supplier verification records. Produces both individual analytical results and verification records assessed over…
Blinding yourself: practical methods and their limits Replied, post #35 · Research Methods › N-of-1 designs · 18 Jun 2026 · 4 likes Coming back to post #33, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
What would change my mind about repair peptides: a specific answer Replied, post #10 · Compounds › Repair & healing peptides · 14 Jun 2026 · 1 like On post #6 — agreed on the reasoning, with one qualification. The absence of adequately powered published randomised human trials is the central fact about BPC-157.…
What to include when your question involves a laboratory result Replied, post #8 · Start Here › How to Ask · 14 Jun 2026 · 11 likes Units. Everything needs units. This is why we ask every single time. I have seen the same arithmetic done three different ways depending on whether the person was…
Coming back to: Solubility limits and what a cloudy solution is telling you Replied, post #29 · Pharmacology › Formulation chemistry · 6 Jun 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…
Why the timeline is on the right and not the left — what changed since Replied, post #47 · Meta › Site feedback · 2 Jun 2026 · 12 likes On post #43 — agreed on the reasoning, with one qualification. Navigation problems: if you cannot find something you expected to exist, or the path to it is unclear,…
Alcohol: what is documented and what is folklore Replied, post #30 · Practice › Interactions · 27 May 2026 · 23 likes I read post #28 twice before replying, because I had assumed the opposite. Separation timing versus clinically important interaction: a separation timing inconvenience…
Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #79 · Compounds › Tirzepatide · 23 May 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…
Search filters: what is missing Replied, post #55 · Meta › Site feedback · 8 May 2026 · 0 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…
Cold solution and stinging: the simplest fix Replied, post #22 · Practice › Administration · 5 May 2026 · 19 likes I read post #20 twice before replying, because I had assumed the opposite. Drawing up with one needle and injecting with another: a reasonable practice if you have…
Reading a home test result without over-claiming Replied, post #28 · Analytics › Home & field testing · 1 May 2026 · 18 likes post #27 answers the question as asked. The question underneath it is different. What physical quantity does the device measure? A colorimetric or lateral-flow method…
Solubility limits and what a cloudy solution is telling you Replied, post #8 · Pharmacology › Formulation chemistry · 24 Apr 2026 · 0 likes post #7 is right about the mechanism and I think understates the practical bit. Isotonicity: an isotonic solution has the same osmotic pressure as blood. Non-isotonic…
Journal club: is percentage weight change the right endpoint? Replied, post #80 · Evidence › Journal club · 18 Apr 2026 · 0 likes I read post #78 twice before replying, because I had assumed the opposite. SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective…
Spike-and-recover accuracy for a peptide assay Replied, post #101 · Analytics › Method validation · 10 Apr 2026 · 0 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…
Why the absence of controlled human data on BPC-157 matters more than people admit Replied, post #9 · Compounds › Repair & healing peptides · 8 Apr 2026 · 0 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…
Revisiting: Absolute versus relative contraindications Replied, post #51 · Safety › Contraindications · 25 Mar 2026 · 13 likes Picking up post #48: that is the part I would want checked first. Pregnancy: these compounds are not approved for pregnancy. The potential risks outweigh potential…
[2026 update] Regional warehouse stock versus direct despatch Replied, post #22 · Sourcing › Logistics · 21 Mar 2026 · 2 likes Packaging integrity on arrival: if a parcel arrives with compromised packaging, that is evidence of a handling problem in transit. The contents may or may not be…
Lean mass preservation: what the evidence supports — does this still hold? Replied, post #42 · Outcomes › Body composition · 15 Mar 2026 · 23 likes DXA (dual-energy X-ray absorptiometry): the standard for body composition in research. Precision is roughly ±1 kg for lean mass. Two scans six months apart on the same…
Coming back to: Semaglutide in people without diabetes: what the evidence base looks like Replied, post #40 · Compounds › Semaglutide · 13 Mar 2026 · 12 likes Picking up post #37: that is the part I would want checked first. Is there a ceiling dose beyond which the effect plateaus? The trials did not study that because they…
Nausea profile of amylin analogues compared with GLP-1 agonists Replied, post #60 · Compounds › Cagrilintide & amylin analogues · 12 Mar 2026 · 0 likes On post #56 — agreed on the reasoning, with one qualification. The dosing interval: cagrilintide's half-life is roughly 7 to 8 days, suitable for weekly dosing. The…
About the COA interpretation category Replied, post #5 · Analytics › COA interpretation · 5 Mar 2026 · 28 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…
Why "dose equivalence" between different incretin analogues is a weak concept Replied, post #108 · Practice › Dosing & titration · 20 Feb 2026 · 3 likes The four-week escalation interval is a convention from the pivotal trials, not a pharmacological constant. The pharmacological argument is that with a week-long…
Mass error in ppm: the arithmetic and the caveat Replied, post #83 · Analytics › Mass spectrometry · 14 Feb 2026 · 15 likes Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A [M+Na]+ peak is common and its mass is predictable from the base mass.
Mass error in ppm: the arithmetic and the caveat Replied, post #62 · Analytics › Mass spectrometry · 14 Feb 2026 · 0 likes Purity and identity are different questions: LC-MS establishes that the species at a retention time has the expected mass. It does not establish how much of the sample…
Trifluoroacetate content and its consequences Replied, post #53 · Analytics › Impurities & related substances · 31 Jan 2026 · 1 like post #52 is right about the mechanism and I think understates the practical bit. Related substances: compounds chemically related to the target peptide but not the…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #31 · Documentation › Wiki requests · 10 Jan 2026 · 0 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…
Retatrutide's phase 2 heart-rate signal and how to think about it Replied, post #24 · Compounds › Retatrutide · 4 Jan 2026 · 16 likes Phase 2 sample sizes are not adequate for safety characterisation of a novel triple agonist. Phase 3 is where that question gets answered. Using phase 2 results to make…
[2026 update] Evidence quality in the secretagogue literature: an honest assessment Replied, post #4 · Compounds › Secretagogues & GH axis · 27 Dec 2025 · 0 likes Tesamorelin has an approved indication in HIV-associated lipodystrophy. That is the only compound in this class with a registration-quality evidence base from a proper…
[2026 update] What steady state means for the decision to escalate Replied, post #79 · Practice › Dosing & titration · 13 Nov 2025 · 0 likes Stepping down deliberately: the withdrawal trials show that stopping is followed by regain. The step-down literature is thinner. The conservative assumption is that…
What happens after your first post: likes, trust levels, and why none of it matters much… Replied, post #28 · Start Here › Welcome · 14 Oct 2025 · 4 likes The FAQ link in the sidebar is maintained and worth ten hours of forum browsing. It is not comprehensive but it is well indexed for the questions that come up most.
What happens after your first post: likes, trust levels, and why none of it matters much… Started this topic · Start Here › Welcome · 10 Oct 2025 · 0 likes The question in the title: What happens after your first post: likes, trust levels, and why none of it matters much — what changed since I will give what I have already…
Can a home kit substitute for a laboratory report? A careful no Replied, post #26 · Analytics › Home & field testing · 8 Oct 2025 · 3 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 the titration planner refuses to produce a schedule below a floor Replied, post #126 · Data & Tools › Calculators · 23 Sep 2025 · 0 likes Why calculators are not medical advice: they do arithmetic. Medical decisions are not arithmetic. A calculator that says a certain dose is "compatible with" a certain…
Reading SURMOUNT-1 without the press release Replied, post #14 · Compounds › Tirzepatide · 22 Sep 2025 · 22 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…
[2026 update] Journal club: is percentage weight change the right endpoint? Replied, post #62 · Evidence › Journal club · 18 Aug 2025 · 15 likes Coming back to post #60, because the follow-up matters more than the original answer. FLOW (N Engl J Med 2024): Semaglutide renal outcomes in type 2 diabetes and…
Journal club: indirect comparison between two programmes, defended and attacked — one… Replied, post #29 · Evidence › Journal club · 16 Aug 2025 · 5 likes This follows post #26 rather than contradicting it. SOUL (N Engl J Med 2025): Oral semaglutide cardiovascular outcomes. Extends the cardiovascular evidence to the oral…
The "under review" status pill and when a moderator applies it — a second dataset Replied, post #17 · Evidence › Preprints · 16 Aug 2025 · 5 likes Picking up post #14: that is the part I would want checked first. Do not build anything on a preprint that you would mind rebuilding: if the preprint later changes…
Documentation that appears only after payment Replied, post #2 · Sourcing › Red flags · 7 Aug 2025 · 1 like the opening post is right about the mechanism and I think understates the practical bit. Pricing patterns: unusually low prices for what are otherwise consistent with…
[2026 update] Splitting an overlong document into two Replied, post #20 · Documentation › Wiki requests · 29 Jul 2025 · 8 likes Coming back to post #18, because the follow-up matters more than the original answer. Cross-referencing: if you notice two pages that should reference each other but do…
TB-500 and thymosin beta-4: the fragment versus the protein Replied, post #84 · Compounds › Repair & healing peptides · 29 Jul 2025 · 15 likes post #83 answers the question as asked. The question underneath it is different. Publication patterns in the BPC-157 literature: a large proportion of the evidence…
When to stop reading forums, including this one Replied, post #3 · Wellbeing › Mental health · 1 Jul 2025 · 1 like Motivation and expectation: starting with clear motivation and realistic expectations about what will happen and when helps with psychological adjustment.
Revisiting: What to include when your question involves arithmetic Replied, post #9 · Start Here › How to Ask · 29 Jun 2025 · 15 likes I read post #7 twice before replying, because I had assumed the opposite. Asking a follow-up: new topic or reply in the old one? If the answer depends on the previous…
Second pass at: Pen dose counters: what a click does and does not guarantee Replied, post #64 · Devices › Pens & autoinjectors · 12 Jun 2025 · 26 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…
Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #111 · Devices › Cold chain · 27 May 2025 · 1 like Worth separating two things that post #107 runs together. Assessing an excursion: if a package sat at room temperature for a time, visual inspection (cloudiness,…
Why the timeline is on the right and not the left Replied, post #21 · Meta › Site feedback · 24 May 2025 · 0 likes Guideline clarity: if the guidelines are unclear or seem to be applied inconsistently, post the specific situation so staff can clarify or reconsider.
When a preprint is the best available evidence and we say so — a second dataset Replied, post #21 · Evidence › Preprints · 3 May 2025 · 0 likes Worth separating two things that post #17 runs together. Check whether it was later published: searching for the preprint's first author and keywords in PubMed might…
[2026 update] Building a sensible monitoring schedule with your prescriber Replied, post #12 · Clinical › Bloodwork · 28 Apr 2025 · 7 likes Picking up post #9: that is the part I would want checked first. Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #92 · Compounds › Semaglutide · 26 Apr 2025 · 2 likes post #91 answers the question as asked. The question underneath it is different. On alcohol: the labelling does not contraindicate it, but it raises gastric irritation…
Coverage for the indication versus for the drug Replied, post #39 · Access › Insurance & coverage · 23 Apr 2025 · 1 like 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…
A well-designed study with a badly written abstract Replied, post #13 · Evidence › Study critique · 7 Apr 2025 · 0 likes Worth separating two things that post #9 runs together. Generalisability: do the inclusion/exclusion criteria narrow the population so much that results do not apply to…
Journal club: the retatrutide phase 2 obesity paper Started this topic · Evidence › Journal club · 6 Apr 2025 · 21 likes Journal club: the retatrutide phase 2 obesity paper — setting out what I have, and where I think it stops being reliable. I have seen FLOW ( N Engl J Med , 2024) cited…
Why cagrilintide alone is discussed so much less than in combination Replied, post #34 · Compounds › Cagrilintide & amylin analogues · 26 Mar 2025 · 32 likes Is synergy the right word for the combination data? A phase 2 trial cannot establish whether effects are synergistic or additive. Synergy is a mechanistic claim that…
Reading order for a first week here, and what to skip until later Replied, post #46 · Start Here › Welcome · 21 Mar 2025 · 10 likes This follows post #43 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Assessing a warm arrival: the decision process Replied, post #8 · Sourcing › Logistics · 1 Mar 2025 · 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…
Why mass spectrometry cannot tell you about an epimer Replied, post #63 · Analytics › Mass spectrometry · 19 Feb 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…
Distinguishing a deletion sequence by mass alone — the long version Replied, post #5 · Analytics › Mass spectrometry · 17 Feb 2025 · 10 likes Picking up post #2: that is the part I would want checked first. For anyone arriving from a search: the marked solution above is the direct answer, and the replies…
Protein density versus volume when you cannot eat much Replied, post #92 · Nutrition & Training › Protein & intake · 8 Feb 2025 · 17 likes Protein supplements: whey, casein, and plant-based protein powders can help hit targets when whole-food intake is limited by appetite. Protein quality (all essential…
A promotion I argued against, and why I lost Replied, post #89 · Documentation › Doc review · 7 Feb 2025 · 0 likes For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
Protein density versus volume when you cannot eat much Replied, post #73 · Nutrition & Training › Protein & intake · 5 Feb 2025 · 18 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…
Second pass at: Regression to the mean in progress reports Replied, post #45 · Research Methods › Statistics · 4 Feb 2025 · 14 likes Multiplicity and multiple comparisons: if you test many hypotheses, the chance of finding a false positive by random chance increases. That is why pre-specifying the…
Coming back to: Reading a meta-analysis you disagree with, fairly Replied, post #21 · Evidence › Meta-analyses · 19 Jan 2025 · 15 likes When a meta-analysis is unhelpful: if the included studies are heterogeneous in population, intervention, or outcome, pooling them produces a number that represents…
Body image changing more slowly than the body Replied, post #91 · Wellbeing › Mental health · 21 Dec 2024 · 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…
[2026 update] New subcategory: rationale and scope Replied, post #52 · Meta › Announcements · 9 Dec 2024 · 0 likes I read post #50 twice before replying, because I had assumed the opposite. Staff announcements, policy changes, and scheduled maintenance. Read-only except for…
EMA product information as a primary source — does this still hold? Replied, post #91 · Regional › European Union · 17 Nov 2024 · 2 likes This follows post #88 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Why "any advice?" is the least effective ending for a post Replied, post #23 · Start Here › How to Ask · 10 Nov 2024 · 11 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…
Transporting a vial for a weekend away Replied, post #15 · Practice › Storage & stability · 29 Oct 2024 · 31 likes Worth separating two things that post #11 runs together. Container choice matters: the material of the vial, the rubber closure, the fill volume all affect how quickly…
Second pass at: A field-by-field walk through a certificate of analysis Replied, post #78 · Analytics › COA interpretation · 8 Oct 2024 · 0 likes On post #74 — agreed on the reasoning, with one qualification. Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is…
Revisiting: Melanocortin agonists: mechanism and the documented adverse profile Replied, post #39 · Compounds › Other compounds · 8 Oct 2024 · 0 likes Melanocortin agonists: mechanism involves the melanocortin-4 receptor pathway that regulates appetite. The documented adverse profile includes blood pressure elevation…
The topic list is dense — is that deliberate? Replied, post #30 · Meta › Site feedback · 25 Sep 2024 · 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…
Reporting a discrepancy without making an allegation Replied, post #80 · Sourcing › Vendor reports · 18 Sep 2024 · 32 likes What "verified" means on our pages: specific lots were independently measured on stated dates by named services and results were consistent with the supplier's…
Gradient steepness and apparent purity: a worked comparison Replied, post #2 · Analytics › HPLC & UHPLC · 24 Aug 2024 · 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…
Naming conventions for research peptides and the confusion they cause — one year on Replied, post #6 · Compounds › Other compounds · 2 Aug 2024 · 1 like AOD-9604 is a fragment of human growth hormone and has been discussed as a potential weight-loss agent based on theoretical mechanism. The fragment hypothesis — that…
Where the four-week escalation interval comes from, and what it is not Replied, post #21 · Practice › Dosing & titration · 14 Jun 2024 · 11 likes Micro-titration: the concept of increments smaller than the labelled steps. It has no evidence base from trials but is described by some people. The downside is that…
Spreadsheets: an appreciation Replied, post #11 · Lounge › Off topic · 6 Jun 2024 · 16 likes Industry and supply chain: post about manufacturing, pharmaceutical economics, or market dynamics if you have something substantive to contribute.