desiccant_notes

TL2 Member · Bari, IT

Here for the documentation. Occasionally files a wiki request when a page has drifted out of date.

Joined 2 May 2025 · last posted 2d

84 posts, newest first. Showing up to 150.

Revisiting: Protein density versus volume when you cannot eat much Replied, post #109 · Nutrition & Training › Protein & intake · 26 Jul 2026 · 5 likes Taking post #107 at face value and following it one step further. Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per kilogram of…
[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #63 · Analytics › HPLC & UHPLC · 23 Jul 2026 · 0 likes Offering a way to settle Detection wavelength rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within…
Coming back to: Time to steady state after a dose increase Replied, post #108 · Pharmacology › Pharmacokinetics · 23 Jul 2026 · 3 likes Loading doses are not used in this class and the pharmacokinetic reason is tolerability rather than efficacy. A loading dose would reach steady state faster and would…
Spreadsheets: an appreciation — what changed since Replied, post #108 · Lounge › Off topic · 21 Jul 2026 · 19 likes Having read the whole Spreadsheets thread before replying: the question in the first post has not actually been answered yet, and three of us have answered a nearby one…
Coming back to: Where the four-week escalation interval comes from, and what it is not Replied, post #33 · Practice › Dosing & titration · 18 Jul 2026 · 3 likes Worth separating two things that post #31 runs together. Titrating on tolerability rather than on the calendar: some people escalate when they tolerate a dose well,…
Pooling trials with different estimands Replied, post #91 · Evidence › Meta-analyses · 12 Jul 2026 · 1 like Individual participant data pooling is a much stronger design than aggregate pooling and is rare because it requires cooperation rather than a search.
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #17 · Practice › Interactions · 6 Jul 2026 · 0 likes Everything in post #16 holds. The case it does not cover is the one I have. The version of Antibiotics that I was taught turned out to be a teaching simplification.…
Reused chromatograms across lots: how to spot it Replied, post #53 · Analytics › COA interpretation · 28 Jun 2026 · 15 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…
Personal or family history of medullary thyroid carcinoma Replied, post #25 · Safety › Contraindications · 28 Jun 2026 · 19 likes Allergy to the specific compound: true allergy is rare but possible. Any prior allergic reaction to the same compound or to structurally similar peptides warrants…
Private prescribing in the UK: what is actually involved Replied, post #46 · Regional › UK & Ireland · 23 Jun 2026 · 0 likes Ireland: the Health Products Regulatory Authority implements EU framework. Prescription-only. Reimbursement for weight management has been more restrictive than for…
Coming back to: Specificity, linearity, accuracy, precision, range, robustness — with… Replied, post #60 · Analytics › Method validation · 20 Jun 2026 · 0 likes Useful. I had the fact and not the reason, which turns out to be the important half.
[2026 update] Travelling with an injectable: documentation and practicalities Replied, post #25 · Access › International · 20 Jun 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…
Peak-to-trough ratio at steady state for a weekly agent — the long version Replied, post #29 · Pharmacology › Pharmacokinetics · 19 Jun 2026 · 15 likes I had written a reply contradicting post #25 and deleted it. Here is what survived. Peak-to-trough ratio: I would want to see the raw numbers rather than the summary…
[2026 update] Interpreting a result that disagrees with the supplier's certificate Replied, post #13 · Sourcing › Independent verification · 12 Jun 2026 · 4 likes No disagreement from me. Posting only so the question does not look ignored.
Second pass at: When your prescriber and the evidence disagree Replied, post #34 · Clinical › Prescriber conversations · 11 Jun 2026 · 2 likes Where you disagree, saying so plainly and asking for the reasoning is better than agreeing and not following the plan.
Second pass at: The storage lookup and where its data comes from Replied, post #29 · Data & Tools › Calculators · 10 Jun 2026 · 9 likes Taking post #28 at face value and following it one step further. Two people in this thread mean different things by storage lookup and are disagreeing about the…
Second pass at: Leak-back after withdrawal and whether you lost a meaningful dose Replied, post #17 · Practice › Administration · 1 Jun 2026 · 8 likes Careful with the language on Leak-back. "Not detected" and "not present" are different findings and the first is a statement about the method.
Peak-to-trough ratio at steady state for a weekly agent Replied, post #12 · Pharmacology › Pharmacokinetics · 30 May 2026 · 20 likes On peak-to-trough ratio I would separate what is worth knowing from what is worth acting on. The first list is long and the second is short, and conflating them is how…
[2026 update] A vial that will not fully dissolve: what to check and in what order Replied, post #77 · Practice › Reconstitution · 28 May 2026 · 0 likes I had written a reply contradicting post #75 and deleted it. Here is what survived. Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2…
Second pass at: Absence of evidence and evidence of absence Replied, post #8 · Research Methods › Statistics · 24 May 2026 · 2 likes Since Absence of evidence keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct…
The anatomy of a question that gets answered within an hour Replied, post #47 · Start Here › How to Ask · 16 May 2026 · 25 likes I had written a reply contradicting post #45 and deleted it. Here is what survived. Timeline questions need the timeline. Dates, in order, with what happened on each.…
Follow-up: Search filters: what is missing Replied, post #89 · Meta › Site feedback · 29 Apr 2026 · 9 likes The honest answer on Search filters is that it depends, and the useful part is the list of what it depends on. Four items, in rough order of how much they matter. Most…
[2026 update] Composite endpoints and the component doing the work Replied, post #83 · Evidence › Trials · 24 Apr 2026 · 7 likes Post #82 is the version of this I will quote in future. One addition. Absolute and relative effects answer different questions. Write down the event rate in each arm…
Pregnancy and pregnancy planning: contraindication and washout Replied, post #61 · Clinical › Special populations · 4 Mar 2026 · 0 likes Pregnancy and pregnancy planning was covered in the wiki last year and the page has a review date on it, which is a better starting point than my memory of a thread.
MHRA statements, read directly Replied, post #100 · Regional › UK & Ireland · 2 Mar 2026 · 30 likes Where the MHRA statements reasoning breaks down for me is the step from the group result to the individual case. That step is almost never argued for.
Contributing data without breaching anyone's privacy Replied, post #4 · Data & Tools › Datasets · 2 Mar 2026 · 13 likes Trying to state the contributing data without breaching position in a way that someone who disagrees would recognise as fair, because I do not think the version in this…
Warfarin and altered intake: the monitoring argument — the long version Replied, post #122 · Practice › Interactions · 1 Mar 2026 · 2 likes Two people in this thread mean different things by Warfarin and altered intake and are disagreeing about the definition while believing they are disagreeing about the…
Revisiting: Maintainer handover: how it works Replied, post #20 · Meta › Wiki maintenance · 27 Feb 2026 · 7 likes Post #17 and I disagree about the size of the effect, not about the direction. That matches how I use it. The general statement is what you check afterwards, not what…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #131 · Analytics › COA interpretation · 13 Feb 2026 · 10 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…
Non-inferiority margins: how they are chosen and how they are abused — a second dataset Replied, post #26 · Evidence › Trials · 10 Feb 2026 · 0 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…
What TRIUMPH is designed to answer, and why we should not pre-empt it — does this still… Started this topic · Compounds › Retatrutide · 9 Feb 2026 · 33 likes Asking directly, because I could not find a straight answer: What TRIUMPH is designed to answer, and why we should not pre-empt it — does this still hold? An honest…
Alcohol: what is documented and what is folklore — the long version Replied, post #13 · Practice › Interactions · 27 Jan 2026 · 0 likes This follows post #11 rather than contradicting it. Speaking only to Alcohol as I have actually seen it, rather than as it is usually described: the effect is real, it…
Why semaglutide solutions can look faintly opalescent and when that matters Replied, post #59 · Compounds › Semaglutide · 24 Jan 2026 · 0 likes Post #57 is right about the mechanism and I think understates the practical bit. On identity confirmation: a mass close to 4113.6 Da on the intact molecule is…
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #71 · Clinical › Special populations · 9 Jan 2026 · 5 likes Hypoglycemia risk: in people already on insulin or sulfonylureas, adding a GLP-1 agonist requires insulin dose reduction and close monitoring for hypoglycemia. This is…
Temperature loggers worth the money — the long version Replied, post #105 · Devices › Cold chain · 2 Jan 2026 · 28 likes On post #103 — agreed on the reasoning, with one qualification. If you are not going to be there, arranging a secure delivery point is worth more than any packing…
[2026 update] Availability by country, dated, with primary sources Replied, post #7 · Access › International · 1 Jan 2026 · 0 likes Post #6 is the version of this I will quote in future. One addition. Both are useful and they are different contributions. A first-hand account and a citation answer…
Heterogeneity as information rather than as a nuisance Replied, post #38 · Evidence › Meta-analyses · 26 Dec 2025 · 3 likes A note on scope: what I am saying about heterogeneity applies to the case in the first post and I would not extend it further without checking.
Preprint servers and what screening they do Replied, post #3 · Evidence › Preprints · 18 Dec 2025 · 11 likes On the opening post — agreed on the reasoning, with one qualification. A preprint with the data and code attached is frequently more checkable than a published paper…
DXA precision and the least significant change for lean mass Replied, post #69 · Outcomes › Body composition · 14 Dec 2025 · 10 likes Maintenance phase: tracking body composition during maintenance (weight stable) is different from tracking during active loss. Changes are smaller and precision becomes…
Angle of injection and whether 90 degrees is always right Replied, post #65 · Practice › Administration · 13 Dec 2025 · 6 likes Narrowing post #64, because the general version has more than one answer. Having read the whole angle of injection thread before replying: the question in the first…
How the vendor documentation pages are maintained, and by whom — what changed since Replied, post #97 · Sourcing › Vendor reports · 24 Nov 2025 · 0 likes Where I part company with post #96, and it is a narrow parting. A request rather than an answer: could whoever has the primary source for vendor documentation pages…
Documentation that materially improves an appeal's chances Replied, post #74 · Access › Insurance & coverage · 22 Nov 2025 · 12 likes No notes. Posting so the count is not one.
Pen dose counters: what a click does and does not guarantee Replied, post #108 · Devices › Pens & autoinjectors · 19 Nov 2025 · 8 likes A pen taken straight from the refrigerator is uncomfortable to inject for the same reason a cold syringe is. Room temperature for a short while first is the standard…
Why an oral GLP-1 agonist is a formulation achievement more than a chemistry one Replied, post #51 · Compounds › Oral incretins · 19 Nov 2025 · 14 likes Taking post #49 at face value and following it one step further. The practical argument for an oral is adherence, and the published adherence data is less flattering…
Second pass at: The mass-error checker and its intended scope Replied, post #58 · Data & Tools › Calculators · 8 Nov 2025 · 4 likes The arithmetic in post #57 is right; the assumption feeding it is the part to check. Dose equivalence calculator: compounds have different potencies. The calculator is…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #78 · Practice › Reconstitution · 7 Nov 2025 · 0 likes Choose the concentration so that a typical dose lands on a graduation you can actually read. A dose that falls between two marks on a 1 mL barrel is a dose you will get…
Endotoxin and why it is a separate question from purity Started this topic · Analytics › Impurities & related substances · 6 Nov 2025 · 0 likes Endotoxin and why it is a separate question from purity Writing it up because I had to work it out twice and would rather nobody else did. A question about endotoxin…
The nausea timeline across the first four weeks, with a tabulated log — what changed since Replied, post #14 · Practice › Side effects · 28 Oct 2025 · 14 likes Constipation is reported at least as often as nausea and is discussed a fraction as much. Fluid, fibre and movement are the boring answers and they are the ones that…
Sleep tracking data and its considerable limitations Replied, post #113 · Wellbeing › Sleep · 28 Oct 2025 · 0 likes I had written a reply contradicting post #111 and deleted it. Here is what survived. A sleep diary with times rather than impressions is the only way to tell a real…
Thyroid function tests during substantial weight change Replied, post #87 · Clinical › Bloodwork · 7 Oct 2025 · 0 likes Add biological variation and analytical imprecision to that base rate and the probability of a meaningless flag on a multi-analyte panel is substantial. I would want to…
Cagrilintide's dosing interval and the pharmacokinetics behind it Replied, post #70 · Compounds › Cagrilintide & amylin analogues · 4 Oct 2025 · 17 likes Reconstitution at higher concentrations is worth avoiding for aggregation-prone material. The published formulation work generally uses lower concentrations than people…
Coming back to: Where the integrator drew the baseline, and how much it moved the number Replied, post #11 · Analytics › HPLC & UHPLC · 25 Sep 2025 · 15 likes Post #7 put the caveat in the right place and I want to underline it. What I would tell a new member reading about integrator for the first time: the confident posts…
[2026 update] Does dual agonism explain the effect size, or is it dose? Replied, post #3 · Compounds › Tirzepatide · 19 Aug 2025 · 18 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
A ten-fold dose error caught before injection Replied, post #82 · Devices › Syringes & needles · 14 Aug 2025 · 8 likes That is a cleaner way of putting what I was circling around.
A ten-fold dose error caught before injection — one year on Replied, post #9 · Devices › Syringes & needles · 1 Aug 2025 · 7 likes Post #6 answers the question as asked. The question underneath it is different. Sharps containers are a legal requirement for disposal in several jurisdictions and a…
High-resolution MS on aggregates and what it can see Replied, post #34 · Analytics › Mass spectrometry · 1 Aug 2025 · 0 likes Thank you for taking the time. That was more work than a reply usually is.
[2026 update] Citation sweep results: how many references did not say what was claimed Replied, post #41 · Meta › Wiki maintenance · 5 Jul 2025 · 1 like Post #39 and I disagree about the size of the effect, not about the direction. I have been on both sides of the Citation sweep results argument in this category within…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #63 · Compounds › Cagrilintide & amylin analogues · 2 Jul 2025 · 29 likes Amylin signalling is distinct from GLP-1 signalling. Amylin slows gastric emptying and promotes satiety through a different receptor and different neural pathways. The…
About the Tirzepatide category Replied, post #3 · Compounds › Tirzepatide · 23 Jun 2025 · 2 likes As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic…
Repeatability versus intermediate precision Replied, post #16 · Analytics › Method validation · 19 Jun 2025 · 3 likes I read post #14 twice before replying, because I had assumed the opposite. The most useful thing anyone has posted about repeatability versus intermediate precision in…
A report I filed that turned out to be wrong, and the correction Replied, post #80 · Sourcing › Vendor reports · 1 Jun 2025 · 27 likes Where I part company with post #78, and it is a narrow parting. Comparing your result to somebody else's on a different lot is not a comparison of suppliers. Lot is the…
A claim built entirely on a subgroup analysis Replied, post #48 · Evidence › Study critique · 22 May 2025 · 29 likes Hold a trial to the standard something could actually have met. A criticism that no achievable design could have answered is a criticism of the field rather than of the…
Lean mass preservation: what the evidence supports Replied, post #26 · Outcomes › Body composition · 21 May 2025 · 5 likes The arithmetic on lean mass preservation is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will…
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ Replied, post #88 · Sourcing › Independent verification · 13 May 2025 · 16 likes Picking up post #87: that is the part I would want checked first. It does not extend to lots nobody has seen, it is not a recommendation, and it says nothing about…
Fibre intake when total intake falls, and the constipation link Replied, post #62 · Nutrition & Training › Protein & intake · 3 May 2025 · 27 likes Where somebody reports losing strength, intake and training stimulus are the first two things to look at rather than the compound.
Lyophilisation and why the cake looks the way it does Started this topic · Pharmacology › Formulation chemistry · 27 Apr 2025 · 0 likes Posting this under the heading it deserves: Lyophilisation and why the cake looks the way it does Everything below is what sits behind that. I was wrong about…
Second pass at: A history of disordered eating: proceeding carefully Replied, post #39 · Wellbeing › Mental health · 24 Apr 2025 · 19 likes My position on history of disordered eating is current rather than settled. I have revised it once already and I expect to again, so treat it accordingly.
Second pass at: How to research a compound with no human data without deceiving yourself Replied, post #38 · Compounds › Other compounds · 3 Apr 2025 · 6 likes This subcategory exists because some people will research compounds outside the main groups discussed here. The standard of evidence and honesty about its limits…
When "no data" is the complete and final answer Replied, post #126 · Compounds › Other compounds · 23 Mar 2025 · 2 likes Building on post #124 rather than restating it. Thymosin alpha-1 has a regulatory history in several jurisdictions and a real clinical literature, which puts it in a…
Retatrutide dose escalation in the published trials Replied, post #38 · Compounds › Retatrutide · 22 Mar 2025 · 1 like Anyone deciding on the basis of what is published should know that what is published is a phase 2 programme and some pharmacokinetics. That is a genuinely early…
One lot is one lot: when a report becomes a pattern — the long version Replied, post #40 · Sourcing › Vendor reports · 16 Mar 2025 · 9 likes Post #36 put the caveat in the right place and I want to underline it. Do not adjust a reported figure. Post what the laboratory said and put your interpretation in a…
Charge states for a 4 kDa peptide, worked through Replied, post #93 · Analytics › Mass spectrometry · 13 Mar 2025 · 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.
Charge states for a 4 kDa peptide, worked through Replied, post #78 · Analytics › Mass spectrometry · 11 Mar 2025 · 9 likes Sample matrix effects: if a sample is dissolved in a complex matrix, other compounds in the matrix can suppress the peptide signal. Clean samples give higher…
Biased agonism: a real phenomenon, an over-used explanation Replied, post #75 · Pharmacology › Receptor biology · 11 Mar 2025 · 0 likes GLP-1 receptor agonism produces its metabolic effects through more than one route: central satiety signalling, delayed gastric emptying, and glucose-dependent insulin…
What the published dose-response for semaglutide actually looks like above 2.4 mg — a… Replied, post #91 · Compounds › Semaglutide · 7 Mar 2025 · 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…
Revisiting: Semaglutide formulation: what is in the licensed product besides the peptide Replied, post #33 · Compounds › Semaglutide · 23 Dec 2024 · 15 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…
Coming back to: When to suspect the method rather than the sample Replied, post #72 · Analytics › Method validation · 14 Dec 2024 · 4 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…
Second opinions: how to seek one without burning the first Replied, post #4 · Clinical › Prescriber conversations · 24 Nov 2024 · 17 likes Write the questions down in advance and put the most important one first. Appointments end and the order is what decides which questions get answered. This is the…
Time to steady state after a dose increase Replied, post #49 · Pharmacology › Pharmacokinetics · 3 Nov 2024 · 19 likes Taking post #46 at face value and following it one step further. Bioavailability: oral semaglutide has low bioavailability (roughly 1%) due to peptide instability. That…
US compounding rules and how they changed Replied, post #38 · Regional › North America · 24 Oct 2024 · 25 likes Both are useful and different. The account tells you what happens in practice; the criterion tells you what to write. I would be interested in a counterexample if…
When a red flag was a misunderstanding, and the retraction Replied, post #25 · Sourcing › Red flags · 29 Sep 2024 · 20 likes That is a cleaner way of putting what I was circling around.
Follow-up: A site rotation scheme that is easy enough to actually follow Replied, post #32 · Practice › Administration · 16 Sep 2024 · 0 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.
Promotion criteria, and the one that stops most nominations Replied, post #59 · Documentation › Doc review · 11 Sep 2024 · 4 likes The most useful review comment names a sentence and says what is wrong with it. General approval and general concern are both hard to act on.
Cold packs, phase-change material, and what survives ten days Replied, post #137 · Sourcing › Logistics · 23 Jul 2024 · 26 likes Anyone deciding whether a delay is a problem should ask what would change if they waited another week. Usually the answer is nothing. That is the shape of it. The…