d.tamm

TL2 Moderator · Aalborg

Contributes reviews on supplier material. Based in Aalborg.

Joined 11 January 2025 · last posted 6d

74 posts, newest first. Showing up to 150.

Submitting a sample: the process end to end Replied, post #102 · Sourcing › Independent verification · 22 Jul 2026 · 0 likes Service differences on vendor pages: Janoshik and Medutest results are measurements on vials. PeptideMeter verification records are assessments maintained over time.…
Common supplements people ask about, assessed one at a time Replied, post #31 · Practice › Interactions · 10 Jul 2026 · 6 likes post #30 answers the question as asked. The question underneath it is different. Supplements and herbs: many have no established interaction. Some do. If you are taking…
[2026 update] Antibiotics and a course of something with delayed emptying Replied, post #5 · Practice › Interactions · 2 Jul 2026 · 8 likes This follows post #2 rather than contradicting it. Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries…
Revisiting: Can a home kit substitute for a laboratory report? A careful no Replied, post #41 · Analytics › Home & field testing · 27 Jun 2026 · 0 likes Why third-party testing is stronger: a home test run by the person who made the compound is a self-selected result. The test run by a neutral third party removes…
I joined for one answer and stayed for a year — what changed my mind Replied, post #27 · Start Here › Welcome · 17 Jun 2026 · 3 likes post #26 is right about the mechanism and I think understates the practical bit. Welcome. The orientation materials are pinned at the top of this category and they take…
Stepping down deliberately, and how to do it without losing progress — what changed since Replied, post #2 · Practice › Dosing & titration · 17 Jun 2026 · 10 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…
Pinch or no pinch, and how needle length changes the answer — the long version Replied, post #74 · Practice › Administration · 14 Jun 2026 · 12 likes post #73 answers the question as asked. The question underneath it is different. Drawing up with one needle and injecting with another: a reasonable practice if you…
Oral versus injectable exposure: comparing apples to a different fruit — a second dataset Replied, post #25 · Compounds › Oral incretins · 11 Jun 2026 · 8 likes Oral bioavailability is variable between people. Some people absorb well; others absorb poorly. That inter-individual variation is larger than with injectables and is…
Second pass at: Programming during a large energy deficit Replied, post #10 · Nutrition & Training › Resistance training · 1 Jun 2026 · 19 likes On post #6 — agreed on the reasoning, with one qualification. Post-weight-loss training: once weight loss is complete and energy deficit ends, training can shift to…
Follow-up: Prior authorisation: what the criteria usually require Replied, post #3 · Access › Insurance & coverage · 1 Jun 2026 · 3 likes Coverage for weight management versus diabetes: many formularies cover these compounds for type 2 diabetes but not for weight management. The indication matters and…
Semaglutide and alcohol: what is actually documented Replied, post #6 · Compounds › Semaglutide · 28 May 2026 · 0 likes Worth separating two things that post #2 runs together. On alcohol: the labelling does not contraindicate it, but it raises gastric irritation risk and semaglutide…
Journal club: LEADER as the historical anchor Replied, post #80 · Evidence › Journal club · 27 May 2026 · 4 likes STEP 1 (N Engl J Med 2021): The pivotal obesity trial for semaglutide and the reference point for most subsequent comparison. Mean weight reduction was substantially…
Programming during a large energy deficit Replied, post #4 · Nutrition & Training › Resistance training · 24 May 2026 · 15 likes post #3 answers the question as asked. The question underneath it is different. Recovery: heavier training on a energy deficit and on a compound that slows gastric…
CJC-1295 with and without DAC: what the modification does Replied, post #60 · Compounds › Secretagogues & GH axis · 18 May 2026 · 1 like Ipamorelin selectivity claims originate in preclinical characterisation and are reasonably well supported for what they claim: less effect on cortisol and prolactin…
MS/MS sequence confirmation: what it costs and when it is worth it — what changed since Replied, post #25 · Analytics › Mass spectrometry · 8 May 2026 · 1 like This follows post #22 rather than contradicting it. Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A [M+Na]+ peak is common and its mass is…
Converting between mg/mL and units per dose, both directions — the long version Replied, post #32 · Practice › Reconstitution · 19 Apr 2026 · 0 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Price changes over 2025 and 2026, tabulated and dated — does this still hold? Replied, post #139 · Access › Pricing · 7 Apr 2026 · 0 likes On post #135 — agreed on the reasoning, with one qualification. List prices versus negotiated prices: the price a pharmaceutical company publishes and the price an…
Research-use-only status: what it means legally and practically Replied, post #23 · Compounds › Other compounds · 4 Apr 2026 · 28 likes How to research a compound with no human data: mechanistic plausibility is one input. Preclinical data is another. The honest position is that you are reasoning from…
An ABAB design with a data table and honest limitations — a second dataset Replied, post #103 · Research Methods › N-of-1 designs · 25 Mar 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…
Pre-registering a personal experiment, seriously — a second dataset Replied, post #47 · Research Methods › N-of-1 designs · 25 Mar 2026 · 7 likes Stopping rules: decide in advance when you will stop measuring (after a defined duration, after a defined number of measurements, or after a defined condition is met).…
Oral semaglutide bioavailability and its variability between people Replied, post #41 · Compounds › Oral incretins · 12 Mar 2026 · 14 likes Oral versus injectable exposure: comparing a 14 mg oral dose with a 0.5 mg injectable dose is comparing apples to a different fruit. The oral bioavailability is low…
The lowest dose that does anything: is that a real question? Replied, post #77 · Practice › Dosing & titration · 6 Mar 2026 · 6 likes On post #73 — agreed on the reasoning, with one qualification. Two things before anyone answers the substance. First, the context in the first post is clear and…
Contributing data without breaching anyone's privacy Replied, post #48 · Data & Tools › Datasets · 5 Mar 2026 · 24 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…
Revisiting: The report format the maintainers ask for, and why each field is there Replied, post #16 · Sourcing › Vendor reports · 29 Jan 2026 · 1 like This follows post #13 rather than contradicting it. Date the report: when the analysis was done matters. Material can degrade in storage. A report from two years ago is…
Second pass at: Pregnancy and pregnancy planning: contraindication and washout Replied, post #122 · Clinical › Special populations · 27 Jan 2026 · 3 likes Gastroparesis: pre-existing severe delayed gastric emptying can worsen with compounds that slow it further. Discussion with a clinician is prudent if this history exists.
How to read a forest plot, properly, from scratch Replied, post #74 · Evidence › Trials · 22 Dec 2025 · 0 likes Absolute numbers, not just relative: a 30% relative reduction tells you the ratio but not the practical magnitude. The event rate in each arm and the difference between…
Documentation that appears only after payment Replied, post #112 · Sourcing › Red flags · 20 Dec 2025 · 4 likes Inability to trace lots: if you ask "where was this synthesised, by whom, under what conditions" and cannot get a clear answer, that is a red flag. Traceability is not…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #87 · Compounds › Tirzepatide · 12 Dec 2025 · 4 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…
Where impurities in solid-phase peptide synthesis come from Replied, post #25 · Analytics › Impurities & related substances · 7 Dec 2025 · 25 likes Dimer and higher-order multimers: two or more peptide molecules bonded together. They appear at double the mass and higher. They may or may not separate from the…
Interpreting a result that disagrees with the supplier's certificate Replied, post #24 · Sourcing › Independent verification · 26 Nov 2025 · 4 likes This follows post #21 rather than contradicting it. Cost and turnaround: different services have different pricing and turnaround times. Janoshik's turnaround is weeks…
[2026 update] How much of the diluent volume the powder itself displaces Replied, post #48 · Practice › Reconstitution · 24 Nov 2025 · 1 like This follows post #45 rather than contradicting it. Over-dilution: if your target dose is 0.25 mg and your syringe is a 1 mL insulin syringe, you need a concentration…
A widely repeated interaction claim that turns out to be unsupported Replied, post #5 · Practice › Interactions · 14 Nov 2025 · 6 likes Insulin interaction: semaglutide and tirzepatide are not contraindicated with insulin but the combination carries hypoglycemia risk if insulin doses are not adjusted.…
Guidelines revision: what changed and why — one year on Replied, post #33 · Meta › Announcements · 7 Nov 2025 · 7 likes On post #29 — agreed on the reasoning, with one qualification. Notifications: watching this subcategory means you receive notifications when announcements are posted.…
The most useful thing you learned here that was not the answer you came for — a second… Replied, post #101 · Lounge › Off topic · 16 Oct 2025 · 24 likes Worth separating two things that post #97 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
How to ask about something you suspect is a bad idea Replied, post #9 · Start Here › How to Ask · 16 Sep 2025 · 23 likes Coming back to post #7, because the follow-up matters more than the original answer. Questions you cannot explain: "I cannot say why I am asking this, but is this…
Coming back to: A community side-effect dataset, with its response rate and biases Replied, post #21 · Data & Tools › Datasets · 15 Sep 2025 · 2 likes post #20 answers the question as asked. The question underneath it is different. Community-collected datasets: some members have compiled datasets from their own…
When a preprint is the best available evidence and we say so Replied, post #152 · Evidence › Preprints · 7 Sep 2025 · 1 like Unrefereed work is not worthless. A great deal of it survives review substantially unchanged. It is also the case that the version appearing in a journal frequently has…
"Greater than or equal to 99%" as a specification rather than a result Replied, post #22 · Analytics › COA interpretation · 19 Aug 2025 · 15 likes A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot and produced a defined result. That is all it is, and it is…
Reading a rodent study on a secretagogue without over-extrapolating Replied, post #35 · Compounds › Secretagogues & GH axis · 13 Aug 2025 · 11 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…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly Replied, post #160 · Compounds › Tirzepatide · 9 Aug 2025 · 12 likes post #159 answers the question as asked. The question underneath it is different. Nausea profile: some people report tirzepatide as less nausea-prone than semaglutide,…
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #77 · Compounds › Oral incretins · 6 Aug 2025 · 29 likes Worth separating two things that post #73 runs together. Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather…
A field-by-field walk through a certificate of analysis Replied, post #117 · Analytics › COA interpretation · 17 Jul 2025 · 17 likes Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very…
Coming back to: Over-dilution: when your dose falls below one readable graduation Replied, post #32 · Practice › Reconstitution · 15 Jul 2025 · 29 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…
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #77 · Practice › Reconstitution · 27 Jun 2025 · 0 likes Picking up post #74: that is the part I would want checked first. Over-dilution: if your target dose is 0.25 mg and your syringe is a 1 mL insulin syringe, you need a…
Journal club: STEP 4 and what a withdrawal design can prove Replied, post #61 · Evidence › Journal club · 21 Jun 2025 · 0 likes Session format: read the paper before posting. The discussion is much better when everyone has. Start with the estimand and population, then methods, then results, then…
Coming back to: Getting a referral rather than a refusal Replied, post #69 · Clinical › Prescriber conversations · 14 Jun 2025 · 0 likes What to bring: copies of relevant lab results, pharmacy records (to confirm doses actually taken), and records of any adverse effects you have experienced with other…
A ten-fold dose error caught before injection Replied, post #48 · Devices › Syringes & needles · 12 Jun 2025 · 30 likes This follows post #45 rather than contradicting it. Fixed versus detachable needles: insulin syringes usually have fixed needles (no dead volume loss to the hub).…
Insulin combinations and hypoglycaemia risk Replied, post #2 · Practice › Interactions · 7 Jun 2025 · 0 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Follow-up: Tracking intake honestly when appetite is absent Replied, post #4 · Nutrition & Training › Protein & intake · 1 Jun 2025 · 9 likes Picking up post #2: that is the part I would want checked first. Liquid versus solid: protein in liquid form (shakes) is easier to consume in volume but might not be as…
Coming back to: What published stability data actually covers, and what it does not Replied, post #52 · Practice › Storage & stability · 30 May 2025 · 6 likes Visual inspection: if a solution is visibly cloudy, discoloured, or contains particles, those are red flags. Faint opalescence or minor colour shift may be normal but…
A well-designed study with a badly written abstract Replied, post #96 · Evidence › Study critique · 21 May 2025 · 19 likes Picking up post #93: that is the part I would want checked first. Choosing the worst interpretation: "The confidence interval includes a harmful effect" is true if the…
Metformin co-administration and additive GI effects Replied, post #26 · Practice › Interactions · 1 May 2025 · 3 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.
Journal club: STEP 1 and the treatment-policy estimand — does this still hold? Replied, post #38 · Evidence › Journal club · 18 Apr 2025 · 0 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
Units, standards, and other things that quietly hold the world together Replied, post #22 · Lounge › Off topic · 18 Apr 2025 · 18 likes Adjacent and interesting: you might post something about nutrition, bioavailability from a food perspective, or the sociology of weight. Adjacent to this community's…
The CagriSema phase 2 paper and what a fixed combination buys Replied, post #24 · Compounds › Cagrilintide & amylin analogues · 28 Mar 2025 · 18 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Second pass at: Triple agonism: additive, synergistic, or neither? Replied, post #30 · Compounds › Retatrutide · 27 Mar 2025 · 9 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
Coming back to: What published stability data actually covers, and what it does not Replied, post #3 · Practice › Storage & stability · 8 Mar 2025 · 2 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
When "no data" is the complete and final answer Replied, post #99 · Compounds › Other compounds · 22 Feb 2025 · 16 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: An 18-month record including the parts that went badly Replied, post #11 · Outcomes › Progress reports · 26 Jan 2025 · 0 likes Coming back to post #9, because the follow-up matters more than the original answer. Two things before anyone answers the substance. First, the context in the first…
Escalating every six weeks instead of four: what I observed over eight months Replied, post #26 · Practice › Dosing & titration · 19 Jan 2025 · 3 likes post #25 answers the question as asked. The question underneath it is different. Micro-titration: the concept of increments smaller than the labelled steps. It has no…
Recovery when intake is low: what to cut first Replied, post #22 · Nutrition & Training › Resistance training · 10 Jan 2025 · 24 likes post #21 answers the question as asked. The question underneath it is different. Cardio and resistance: the interaction between energy-intense cardiovascular training…
[2026 update] EU-wide position versus national implementation Replied, post #3 · Regional › European Union · 7 Jan 2025 · 1 like Pharmacy practice: pharmacies in different EU countries differ in conservatism about irregular prescriptions. Some will decline a prescription they consider irregular;…
Anxiety in the first weeks: drug, situation, or both Replied, post #28 · Wellbeing › Mental health · 18 Dec 2024 · 2 likes Mood and anxiety: mood changes and anxiety are reported by some people. Baseline mental health status matters for risk. Someone with a history of depression should plan…
Fixed versus detachable needles: the trade-offs Replied, post #50 · Devices › Syringes & needles · 14 Dec 2024 · 24 likes Worth separating two things that post #46 runs together. Needle length: typical lengths for subcutaneous injection are 4-6 mm (short), 8 mm (standard), or 10-12 mm…
Reading a preclinical wound-healing model and its relevance to a human tendon Replied, post #115 · Compounds › Repair & healing peptides · 22 Nov 2024 · 21 likes The distinction between "no evidence it works" and "evidence it does not work": we have the first for these compounds. That is genuinely different from the second and…
Amylin analogue mechanism: satiety signalling separate from GLP-1 Replied, post #14 · Compounds › Cagrilintide & amylin analogues · 24 Oct 2024 · 4 likes Worth separating two things that post #10 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
What a stability-indicating method is and how you demonstrate one — one year on Replied, post #50 · Analytics › Method validation · 12 Oct 2024 · 22 likes Linearity: the detector response is proportional to compound concentration across the working range. Demonstrated by running standards at multiple concentrations and…
Follow-up: Trifluoroacetate content and its consequences Replied, post #4 · marked as the solution · Analytics › Impurities & related substances · 11 Oct 2024 · 33 likes On post #2 — agreed on the reasoning, with one qualification. Disulfide formation: if a peptide contains cysteine, it can form disulfide bonds with itself or with other…
Follow-up: Dead volume across syringe and needle combinations Replied, post #43 · Devices › Syringes & needles · 2 Oct 2024 · 4 likes Coming back to post #41, because the follow-up matters more than the original answer. Dead volume: residual liquid in the hub and needle after withdrawal. Typical…
Hepatic effects of glucagon receptor agonism: the mechanistic worry Replied, post #26 · Compounds › Retatrutide · 9 Sep 2024 · 13 likes Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that…
Circumference measurements as a poor man's composition estimate Replied, post #97 · Outcomes › Body composition · 25 Aug 2024 · 17 likes Comparison to published data: the trials reported mean fat and lean mass changes. Individual results vary around that mean. Being above or below average is not a sign…
Coming back to: Purity assay versus content assay: two different numbers Replied, post #2 · Analytics › COA interpretation · 6 Aug 2024 · 0 likes Endotoxin testing is separate: a certificate of purity says nothing about endotoxin. A chemically pure preparation can carry a clinically significant endotoxin load. If…
Second pass at: Retatrutide dose escalation in the published trials Replied, post #55 · Compounds › Retatrutide · 20 Jul 2024 · 0 likes Picking up post #52: that is the part I would want checked first. Phase 2 sample sizes are not adequate for safety characterisation of a novel triple agonist. Phase 3…
Assessing a warm arrival: the decision process — one year on Replied, post #16 · Sourcing › Logistics · 28 May 2024 · 5 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…