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1,535 topics · page 10 of 40

Topic	Participants	Replies	Views	Activity
[2026 update] A vial that will not fully dissolve: what to check and in what order Practice › Reconstitution concentration maths dead volume bacteriostatic water syringe units Solved Posting this under the heading it deserves: A vial that will not fully dissolve: what to check and in what order Everything below is what sits behind that. Practical question with the units stated, because I…	+114	128	20k	1mo
Second pass at: Where impurities in solid-phase peptide synthesis come from Analytics › Impurities & related substances HPLC water content counter-ion content endotoxin testing Second pass at: Where impurities in solid-phase peptide synthesis come from Writing it up because I had to work it out twice and would rather nobody else did. Impurities in solid-phase peptide synthesis, from…	+4	8	7.2k	1mo
How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? Sourcing › Independent verification PeptideMeter VendorInvestigate third-party testing Janoshik Analytical Asking directly, because I could not find a straight answer: How Janoshik, Medutest, PeptideMeter and VendorInvestigate differ — does this still hold? A question about how a record should be read rather than…	+24	28	8k	1mo
Follow-up: State-level differences that actually matter Regional › North America FDA telehealth insurance State-level differences that actually matter — setting out what I have, and where I think it stops being reliable. A follow-up question about State-level differences that I did not know to ask the first time.…	+90	96	4.1k	4mo
About the UK & Ireland category Regional › UK & Ireland NHS MHRA personal import Pinned Wiki MHRA positions, NHS pathways, private prescriptions, and Irish differences. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with its author and a…	+3	7	357	3mo
Currency conversion and the cost you did not see Sourcing › Payments payments research use only documentation quality Currency conversion and the cost you did not see — setting out what I have, and where I think it stops being reliable. Currency and fees, set out so that the comparison can be checked. Quoted amount,…		2	44k	2mo
Racemisation and why it is invisible to a mass measurement — what changed since Analytics › Impurities & related substances forced degradation water content counter-ion content Racemisation and why it is invisible to a mass measurement — what changed since Writing it up because I had to work it out twice and would rather nobody else did. What changes if the standard account of…	+11	15	42k	16d
A checklist for reading a certificate in under two minutes Analytics › COA interpretation certificate of analysis batch & lot numbers amino acid analysis Solved A checklist for reading a certificate in under two minutes — setting out what I have, and where I think it stops being reliable. I would like to understand what this number means before I repeat it anywhere.…	+39	46	38k	1mo
Coming back to: Storing in the door of the fridge is worse than you think Practice › Storage & stability temperature excursion cold chain cloudy or discoloured solution Wiki On the subject in the title: Storing in the door of the fridge is worse than you think Working notes rather than a conclusion. Asking about the failure mode rather than the procedure, because the procedure is…	+2	6	2.1k	1d
Prescription portability between countries Access › International personal import MHRA telehealth EMA Wiki Prescription portability between countries — setting out what I have, and where I think it stops being reliable. Asking about prescription portability between countries directly, because I have read four…	+104	114	6.1k	3h
Pancreatitis history and the risk calculus Safety › Contraindications delayed gastric emptying thyroid C-cell question pancreatitis pregnancy & planning Solved Posting this under the heading it deserves: Pancreatitis history and the risk calculus Everything below is what sits behind that. I would like to know what people here actually do about pancreatitis history,…	+28	32	52k	17h
Why a glucagon receptor agonist in a weight-loss compound is not a contradiction — one year on Compounds › Retatrutide preprint retatrutide TRIUMPH programme randomised trial Why a glucagon receptor agonist in a weight-loss compound is not a contradiction — one year on — that is the question, and I have not found it answered plainly anywhere I have looked. The question about…	+3	7	1k	2mo
Revisiting: Drawing up with one needle and injecting with another Practice › Administration subcutaneous injection injection site reaction needle gauge & length missed dose Revisiting: Drawing up with one needle and injecting with another Writing it up because I had to work it out twice and would rather nobody else did. A practical question that I suspect has a boring answer,…	+76	83	1.1k	4mo
Bug report: the reconstitution calculator and a rounding edge case Data & Tools › Calculators worked example site feedback syringe units concentration maths Bug report: the reconstitution calculator and a rounding edge case — setting out what I have, and where I think it stops being reliable. Posting the calculation with the inputs, so that somebody can disagree…	+68	72	28k	4mo
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Devices › Syringes & needles dead volume needle gauge & length subcutaneous injection Solved On the subject in the title: 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Working notes rather than a conclusion. A follow-up question about 0.3 ml versus 0.5 ml that I did not know to ask the…	+108	124	27k	2mo
Prediction intervals and why they are more honest than confidence intervals Evidence › Meta-analyses heterogeneity risk of bias effect size publication bias Solved Closed Posting this under the heading it deserves: Prediction intervals and why they are more honest than confidence intervals Everything below is what sits behind that. I have spent a fortnight trying to pin…	+21	25	46k	4mo
What changed in 2026, by region — does this still hold? Access › International personal import MHRA EMA telehealth Solved What changed in 2026, by region — does this still hold? I have a specific reason for asking rather than idle curiosity, and the context is below. Documenting an access outcome, dated, because everything in…	+20	25	50k	1d
Personal or family history of medullary thyroid carcinoma — what changed since Safety › Contraindications pancreatitis thyroid C-cell question delayed gastric emptying Posting this under the heading it deserves: Personal or family history of medullary thyroid carcinoma — what changed since Everything below is what sits behind that. Asking about a contraindication as written…	+91	96	1.3k	25d
Revisiting: Theoretical plates: useful number or ritual? Analytics › HPLC & UHPLC system suitability UV & DAD detection gradient method data table Solved Asking directly, because I could not find a straight answer: Revisiting: Theoretical plates: useful number or ritual? Asking about Theoretical plates directly, because I have read four threads on it and each…	+16	21	1.2k	1d
Revisiting: Drawing from a pen cartridge with a syringe: how the risk profile changes Devices › Pens & autoinjectors dead volume missed dose storage subcutaneous injection Revisiting: Drawing from a pen cartridge with a syringe: how the risk profile changes Writing it up because I had to work it out twice and would rather nobody else did. Question about a metering device rather…		2	18k	6h
Deletion sequences: expected mass shifts by residue Analytics › Impurities & related substances water content endotoxin testing forced degradation HPLC Deletion sequences: expected mass shifts by residue — setting out what I have, and where I think it stops being reliable. Deletion sequences keeps being re-asked here and I think that is because the answer is…		2	59	3mo
Coming back to: Half-life, steady state, and accumulation worked through Pharmacology › Pharmacokinetics tirzepatide liraglutide worked example semaglutide On the subject in the title: Half-life, steady state, and accumulation worked through Working notes rather than a conclusion. Working through the kinetics rather than the pharmacology, because I think the…	+14	18	15k	3mo
Reconstituting a multi-strength kit without mixing yourself up — what changed since Practice › Reconstitution concentration maths syringe units bacteriostatic water On the subject in the title: Reconstituting a multi-strength kit without mixing yourself up — what changed since Working notes rather than a conclusion. What changes if the standard account of Reconstituting…	+42	46	1k	7h
Reading a home test result without over-claiming Analytics › Home & field testing ELISA documentation quality LOD & LOQ third-party testing Reading a home test result without over-claiming — setting out what I have, and where I think it stops being reliable. Collecting what is known about reading a home test result in one place, because it is…	+124	137	19k	7h
What "marked as solution" means and who gets to mark it Start Here › Welcome beginner friendly trust levels guidelines onboarding Solved Asking directly, because I could not find a straight answer: What "marked as solution" means and who gets to mark it Question in the title. Context below, and I have tried to include the things people here…		2	290	1d
Review: an evidence digest and the citation check that delayed it Documentation › Doc review citation check review date promoted to docs wiki post On the subject in the title: Review: an evidence digest and the citation check that delayed it Working notes rather than a conclusion. I was wrong about evidence digest in a thread last spring and I would…	+13	17	15k	2d
Blind submission and why it changes minds — the long version Sourcing › Independent verification Medutest third-party testing Janoshik Analytical Posting this under the heading it deserves: Blind submission and why it changes minds — the long version Everything below is what sits behind that. A narrow question about Blind submission, deliberately…	+98	113	18k	2mo
Second pass at: The storage lookup and where its data comes from Data & Tools › Calculators concentration maths syringe units site feedback worked example On the subject in the title: Second pass at: The storage lookup and where its data comes from Working notes rather than a conclusion. Two things I would like separated before anyone answers on storage lookup,…	+38	42	13k	19d
Batch numbers that do not match the vial label Sourcing › Red flags mislabelling disputed moderation underdosing Solved Batch numbers that do not match the vial label — setting out what I have, and where I think it stops being reliable. Structured question about turnaround and what it signals. I have started recording how long…	+43	48	8.9k	2d
[2026 update] Waist circumference technique and its repeatability Outcomes › Progress reports DXA long read effect size data table Posting this under the heading it deserves: Waist circumference technique and its repeatability Everything below is what sits behind that. An honest uncertainty about Waist circumference technique rather than…	+23	27	5.9k	21h