i.amankwah

TL2 · Ibadan

Contributes reviews on supplier material. Based in Ibadan.

Joined 5 March 2025 · last posted 19h

70 posts, newest first. Showing up to 150.

AOD-9604 and the fragment hypothesis, revisited — does this still hold? Replied, post #12 · Compounds › Other compounds · 27 Jul 2026 · 11 likes Posting my AOD-9604 numbers with the method attached so they can be discounted properly. Uncontrolled, unblinded, and collected by someone who wanted a particular answer.
Reading order for a first week here, and what to skip until later — what changed since Replied, post #89 · Start Here › Welcome · 27 Jul 2026 · 6 likes Useful. I have added it to my own notes with the date on it.
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #74 · Compounds › Retatrutide · 19 Jul 2026 · 16 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Prior authorisation: what the criteria usually require — a second dataset Replied, post #18 · Access › Insurance & coverage · 11 Jul 2026 · 16 likes Thank you for the correction. I would rather find out here than later.
Type 2 diabetes and the largest part of the evidence base — does this still hold? Replied, post #19 · Clinical › Comorbidities · 7 Jul 2026 · 32 likes Picking up post #18: that is the part I would want checked first. Genuine question rather than a rhetorical one: has anyone here actually observed Type 2 diabetes, as…
Restarting after a long gap: what the labelling implies Replied, post #11 · Practice › Dosing & titration · 4 Jul 2026 · 3 likes Everything in post #9 holds. The case it does not cover is the one I have. Doubling after a miss adds a peak for no gain and is not what any labelling in this class…
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #39 · Evidence › Journal club · 11 Jun 2026 · 2 likes Worth separating two things that post #37 runs together. Small methodological point on STEP 1: repeating a measurement is cheap and resolves most of what is being…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #97 · Practice › Reconstitution · 8 Jun 2026 · 0 likes No notes. Posting so the count is not one.
Second pass at: Absence of evidence and evidence of absence Replied, post #9 · Research Methods › Statistics · 25 May 2026 · 2 likes A note on how Absence of evidence gets discussed rather than on Absence of evidence itself: the confident posts get the replies and the careful ones get ignored, and…
Second pass at: Leak-back after withdrawal and whether you lost a meaningful dose Replied, post #14 · Practice › Administration · 15 May 2026 · 26 likes Leak-back looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.
A checklist for reading a certificate in under two minutes Replied, post #11 · Analytics › COA interpretation · 26 Apr 2026 · 10 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
About the UK & Ireland category Replied, post #4 · Regional › UK & Ireland · 9 Apr 2026 · 0 likes Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for…
The "under review" status pill and when a moderator applies it Replied, post #55 · Evidence › Preprints · 5 Apr 2026 · 0 likes Post #53 put the caveat in the right place and I want to underline it. Building anything durable on a preprint means committing to rebuild it. That is a reasonable…
MS/MS sequence confirmation: what it costs and when it is worth it — what changed since Replied, post #14 · Analytics › Mass spectrometry · 2 Apr 2026 · 22 likes Tandem mass spectrometry: MS/MS fragments the molecular ion and uses fragment masses to confirm identity and detect modifications. A simple identity confirmation by…
[2026 update] Charge states for a 4 kDa peptide, worked through Replied, post #3 · Analytics › Mass spectrometry · 11 Mar 2026 · 8 likes Adding the measurement that the opening post says would settle it. Sample matrix effects: if a sample is dissolved in a complex matrix, other compounds in the matrix…
Constipation management, with a dietitian's contribution Replied, post #34 · Practice › Side effects · 26 Feb 2026 · 9 likes The bit of constipation management that nobody enjoys is that the answer changes depending on what you are trying to decide with it. Say what the decision is and the…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #138 · Analytics › COA interpretation · 23 Feb 2026 · 29 likes Agreed on all of that, and I have nothing to add to it.
Why "dose equivalence" between different incretin analogues is a weak concept Replied, post #22 · Practice › Dosing & titration · 15 Feb 2026 · 4 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…
[2026 update] What a purity-only report leaves out Replied, post #26 · Sourcing › Independent verification · 15 Feb 2026 · 0 likes I have three months of notes on purity-only and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite…
Non-inferiority margins: how they are chosen and how they are abused — a second dataset Replied, post #29 · Evidence › Trials · 14 Feb 2026 · 0 likes Subgroup analyses are hypothesis-generating unless pre-specified and adequately powered, and almost none are the second. The interaction test matters more than the…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #87 · Documentation › Wiki requests · 13 Feb 2026 · 25 likes Scope creep: if you think a page is attempting too much and should be split into multiple pages, that is a reasonable suggestion.
Foaming during reconstitution and whether it matters — the long version Replied, post #24 · Practice › Reconstitution · 3 Feb 2026 · 26 likes This follows post #23 rather than contradicting it. Reading back through the Foaming during reconstitution threads from last year, the same three questions come up…
Coming back to: Washout: how long is long enough, and for what purpose Replied, post #24 · Pharmacology › Pharmacokinetics · 25 Jan 2026 · 2 likes Post #20 put the caveat in the right place and I want to underline it. What I want from this Washout thread is the list of things that would need to be true for the…
Rotating between abdomen, thigh and upper arm: absorption differences — one year on Replied, post #11 · Practice › Administration · 20 Jan 2026 · 2 likes Speaking only to Rotating between abdomen as I have actually seen it, rather than as it is usually described: the effect is real, it is smaller than the thread…
Rotating between abdomen, thigh and upper arm: absorption differences — one year on Replied, post #6 · Practice › Administration · 4 Jan 2026 · 0 likes Confirming post #3 from a second method, which matters more than confirming it from a second person. The failure mode on Rotating between abdomen is boring rather than…
Meeting a protein target on a suppressed appetite Replied, post #45 · Nutrition & Training › Protein & intake · 26 Dec 2025 · 20 likes Leucine and MPS: leucine stimulates muscle protein synthesis at a threshold of roughly 2 to 3 grams per meal. That influences how much protein per meal matters, but…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #55 · Compounds › Tirzepatide · 8 Dec 2025 · 3 likes Post #51 and I disagree about the size of the effect, not about the direction. Heart rate rises modestly across this class, tirzepatide included. It is consistent,…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #56 · Compounds › Oral incretins · 22 Nov 2025 · 22 likes Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is novel. Getting a peptide across the gastric epithelium at usable…
What a regulator's shortage notice actually authorises — what changed since Replied, post #18 · Sourcing › Regulatory · 14 Nov 2025 · 28 likes Where a claim about legality is made here, the useful follow-up is which instrument it rests on. Most such claims turn out to rest on a forum post. This is where my…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #71 · Practice › Reconstitution · 21 Oct 2025 · 3 likes Sensible. I would want the same detail before I acted on it either.
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #132 · Practice › Reconstitution · 25 Sep 2025 · 27 likes Do not shake. Swirl, or leave it. Vigorous agitation introduces air and shear, and neither helps a peptide go into solution any faster than patience does.
Coming back to: What published stability data actually covers, and what it does not Replied, post #141 · Practice › Storage & stability · 15 Sep 2025 · 18 likes The number people quote for published stability data actually covers is a central estimate presented without its interval, and the interval is wide enough that the…
Aggregated purity results across four services, with caveats — a second dataset Replied, post #137 · Data & Tools › Datasets · 11 Sep 2025 · 9 likes The version of Aggregated purity results across four that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
Aggregated purity results across four services, with caveats — a second dataset Replied, post #30 · Data & Tools › Datasets · 7 Sep 2025 · 0 likes Fine by me. I had wanted a stronger conclusion and there is not one available.
Second pass at: LOD and LOQ: definitions people get wrong Replied, post #15 · Analytics › Method validation · 25 Aug 2025 · 4 likes Post #13 put the caveat in the right place and I want to underline it. Counterpoint on LOD and LOQ, offered without confidence: the same observation is consistent with…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #113 · Compounds › Semaglutide · 10 Aug 2025 · 11 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…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria — a… Replied, post #17 · Analytics › Method validation · 6 Aug 2025 · 27 likes Where I part company with post #16, and it is a narrow parting. Two things can be true about Specificity at once: the mechanism is plausible and the evidence for the…
Deconvolution of a multiply charged envelope Replied, post #2 · Analytics › Mass spectrometry · 27 Jun 2025 · 3 likes Deconvoluted spectra are easier to read and hide the evidence. Ask for the raw charge-state envelope if the identity claim matters to you. The conclusion is tentative;…
Repeatability versus intermediate precision Replied, post #62 · Analytics › Method validation · 25 Jun 2025 · 1 like Confirming post #59 from a second method, which matters more than confirming it from a second person. Answering the repeatability versus intermediate precision question…
Sodium, potassium and magnesium when intake drops Replied, post #11 · Nutrition & Training › Hydration & electrolytes · 10 Jun 2025 · 14 likes I read post #8 twice before replying, because I had assumed the opposite. Fluid intake: baseline needs increase with gastrointestinal effects and exercise. Thirst is…
What this community means by "a source", in practical terms Replied, post #2 · Start Here › Welcome · 8 Jun 2025 · 7 likes The tag pages are usually a better entry point than the categories for a first read. A tag cuts across categories, so following one shows you how the same subject is…
Pregnancy as an absolute contraindication Replied, post #53 · Safety › Contraindications · 19 May 2025 · 4 likes Picking up post #52: that is the part I would want checked first. A rodent toxicology finding underlying a contraindication is worth understanding, because it explains…
DXA precision and the least significant change for lean mass — the long version Replied, post #45 · Outcomes › Body composition · 15 May 2025 · 28 likes Post #42 is right about the mechanism and I think understates the practical bit. Precision versus accuracy: the precision you need depends on what question you are…
Reading order for a first week here, and what to skip until later Replied, post #90 · Start Here › Welcome · 19 Apr 2025 · 4 likes What I would check first on reading order is whether the thing being measured moved or whether the way of measuring it moved. Those look identical in a graph.
Counter-ion content and its effect on measured mass Replied, post #15 · Analytics › Mass spectrometry · 11 Apr 2025 · 9 likes Mass error in parts per million is (observed minus theoretical) divided by theoretical, times a million. On a high-resolution instrument a low single-digit figure is…
Bleeding at the injection site: normal, and what to do about it — does this still hold? Replied, post #18 · Practice › Administration · 11 Apr 2025 · 3 likes If you have to inject at a different time of day than usual, that is a much smaller perturbation than it feels for a weekly compound with a week-long half-life. Adding…
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #39 · Compounds › Other compounds · 5 Apr 2025 · 7 likes When "no data" is the complete and final answer: if there is no published human data on a compound, that is the state of knowledge. Hope is not a substitute and…
Sequence verification for an obscure compound: how it is done Replied, post #3 · Compounds › Other compounds · 29 Mar 2025 · 21 likes Naming conventions for research peptides cause confusion because suppliers do not follow a standard. The same compound gets different names from different suppliers. If…
Coming back to: A critique that turned out to be unfair, retracted by its author Started this topic · Evidence › Study critique · 22 Mar 2025 · 36 likes A critique that turned out to be unfair, retracted by its author — setting out what I have, and where I think it stops being reliable. Reading back through what has…
Washout: how long is long enough, and for what purpose Replied, post #10 · Pharmacology › Pharmacokinetics · 14 Mar 2025 · 0 likes A pharmacokinetic model fitted to trial data describes the population studied. Applying it to somebody outside the enrolled range is an extrapolation, and the model…
Follow-up: Attributing a new peak: degradation product or excipient? Replied, post #2 · Analytics › Impurities & related substances · 14 Feb 2025 · 18 likes Truncation products: fragments from incomplete synthesis or from degradation. They elute quite differently from the intact peptide because they are much smaller and…
What SELECT changed about how semaglutide is discussed, and what it did not Replied, post #10 · Compounds › Semaglutide · 12 Feb 2025 · 0 likes The SELECT trial changed the positioning because it was the first cardiovascular outcome trial in people without diabetes. That decoupled the cardiovascular argument…
Consistent declarations and why they matter more than clever ones Replied, post #22 · Sourcing › Logistics · 12 Feb 2025 · 8 likes Building on post #19 rather than restating it. Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer…
Scheduled maintenance and what will be unavailable Replied, post #25 · Meta › Announcements · 26 Jan 2025 · 24 likes The confident answers on scheduled maintenance and the well-sourced answers are not the same answers, which is the most useful thing I have learned reading this category.
A 5 mg vial and a 0.25 mg dose: the arithmetic in full — the long version Replied, post #16 · Practice › Reconstitution · 19 Jan 2025 · 0 likes Over-dilution: if your target dose is 0.25 mg and your syringe is a 1 mL insulin syringe, you need a concentration high enough that 0.25 mg fits on the scale. A 0.25…
Isotonicity and what happens when you get it wrong Replied, post #25 · Pharmacology › Formulation chemistry · 12 Jan 2025 · 25 likes The arithmetic in post #24 is right; the assumption feeding it is the part to check. If someone has run isotonicity properly I would rather read that than my own…
Dose numbers for oral formulations are not comparable to injectable ones — a second… Replied, post #37 · Compounds › Oral incretins · 10 Jan 2025 · 0 likes Picking up post #36: that is the part I would want checked first. Why an oral formulation is a formulation achievement: the molecule is the same but the tablet is…
Oral semaglutide bioavailability and its variability between people — a second dataset Replied, post #70 · Compounds › Oral incretins · 27 Dec 2024 · 18 likes PIONEER programme is phase 3 for oral semaglutide. The trials cover multiple indications and durations. Reading them requires attention to which trial is which because…
Coming back to: When to suspect the method rather than the sample Replied, post #96 · Analytics › Method validation · 19 Dec 2024 · 0 likes Precision and repeatability: within-run and between-run variability of the method. Acceptance criterion is typically a relative standard deviation of ≤2% for area…
Body image changing more slowly than the body Replied, post #27 · Wellbeing › Mental health · 13 Dec 2024 · 4 likes If you are in crisis, contact a local emergency or crisis service rather than posting. A volunteer forum cannot help and waiting costs time.
Oxidation and deamidation mass shifts, tabulated Replied, post #19 · Analytics › Mass spectrometry · 13 Dec 2024 · 22 likes Coming back to post #17, because the follow-up matters more than the original answer. Calibration matters: a high-resolution instrument out of calibration can report…
Why "any advice?" is the least effective ending for a post Replied, post #67 · Start Here › How to Ask · 24 Nov 2024 · 0 likes I had written a reply contradicting post #63 and deleted it. Here is what survived. What you have already read matters. Saying "I read the maintained page on this and I…
EMA product information as a primary source — does this still hold? Replied, post #147 · Regional › European Union · 19 Nov 2024 · 3 likes Post #146 is the version of this I will quote in future. One addition. Reimbursement is decided nationally and varies substantially between member states for the same…
Oxidation and deamidation mass shifts, tabulated Replied, post #3 · Analytics › Mass spectrometry · 4 Nov 2024 · 1 like Tandem mass spectrometry with fragmentation gives sequence information that intact mass cannot. It is the analysis that would actually confirm identity, and it is…
[2026 update] Step therapy requirements and how to satisfy them Started this topic · Access › Insurance & coverage · 19 Oct 2024 · 50 likes Step therapy requirements and how to satisfy them Writing it up because I had to work it out twice and would rather nobody else did. Something about Step therapy…
Splitting a vial for two laboratories: how to do it without ruining both — what changed… Replied, post #102 · Sourcing › Independent verification · 2 Oct 2024 · 18 likes Picking up post #101: that is the part I would want checked first. A record with four results over sixteen months is a thin record rather than a bad one, and the honest…
Journal club: SURPASS-2 and the semaglutide 1 mg comparator Replied, post #31 · Evidence › Journal club · 1 Sep 2024 · 1 like I changed my mind about SURPASS-2 after someone here asked me for the source and I could not produce one. That is worth saying out loud because it is the ordinary way…
The C-cell question: rodent findings and their human context — what changed since Replied, post #26 · Compounds › Semaglutide · 29 Aug 2024 · 16 likes Confirming post #23 from a second method, which matters more than confirming it from a second person. C-cell question: I would want to see the raw numbers rather than…
Converting between mg/mL and units per dose, both directions Started this topic · Practice › Reconstitution · 20 Aug 2024 · 5 likes Posting this under the heading it deserves: Converting between mg/mL and units per dose, both directions Everything below is what sits behind that. Practical question…
Circumference measurements as a poor man's composition estimate Replied, post #64 · Outcomes › Body composition · 13 Aug 2024 · 2 likes Nothing here is medical advice and none of these measurements is diagnostic on its own.