j.sandvik

TL2 Moderator · Braga

Contributes reviews on supplier material. Based in Braga.

Joined 26 July 2025 · last posted 4d

87 posts, newest first. Showing up to 150.

Common supplements people ask about, assessed one at a time Replied, post #90 · Practice › Interactions · 24 Jul 2026 · 14 likes Anticoagulants: no direct interaction with the compounds in this class. Weight loss and body composition changes might affect the clearance or effect of warfarin if you…
What a certificate commits its issuer to — one year on Replied, post #113 · Analytics › COA interpretation · 20 Jul 2026 · 6 likes post #112 answers the question as asked. The question underneath it is different. For anyone arriving from a search: the marked solution above is the direct answer, and…
Revisiting: How this community labels and discusses unrefereed work Replied, post #15 · Evidence › Preprints · 4 Jul 2026 · 0 likes What changes between preprint and publication: authors respond to reviewer comments, re-analyse data, correct errors found in peer review, and sometimes report…
What a certificate commits its issuer to — one year on Replied, post #97 · Analytics › COA interpretation · 27 Jun 2026 · 24 likes Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very…
Endotoxin and why it is a separate question from purity — what changed since Replied, post #49 · Analytics › Impurities & related substances · 17 Jun 2026 · 9 likes Picking up post #46: that is the part I would want checked first. Related substances: compounds chemically related to the target peptide but not the target peptide…
Micronutrient adequacy at low total intake Replied, post #17 · Nutrition & Training › Protein & intake · 7 Jun 2026 · 14 likes Protein targets during weight loss: the standard recommendation is 1.6 to 2.2 grams per kilogram of body weight. Individual requirements vary but that range is a…
Micro-titration: a disputed topic, argued properly Replied, post #84 · Practice › Dosing & titration · 4 Jun 2026 · 0 likes Holding a dose indefinitely: the trials did not study indefinite holding at a non-maximum dose. The trials escalated to a target and then held that. What happens if you…
An appeal that succeeded, with the letter structure — the long version Replied, post #46 · Access › Insurance & coverage · 3 Jun 2026 · 0 likes post #45 answers the question as asked. The question underneath it is different. Documentation your clinician can provide: letters from clinicians describing why…
Racemisation and why it is invisible to a mass measurement — what changed since Replied, post #9 · Analytics › Impurities & related substances · 3 Jun 2026 · 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…
CJC-1295 with and without DAC: what the modification does Replied, post #71 · Compounds › Secretagogues & GH axis · 31 May 2026 · 26 likes Coming back to post #69, because the follow-up matters more than the original answer. IGF-1 as a surrogate: it is a better integrated measure than a spot growth hormone…
Prescription requirements and telehealth models — a second dataset Replied, post #46 · Sourcing › Regulatory · 29 May 2026 · 19 likes Coming back to post #44, because the follow-up matters more than the original answer. Preclinical versus clinical: compounds with strong preclinical data can fail in…
A checklist for reading a certificate in under two minutes Replied, post #29 · Analytics › COA interpretation · 28 May 2026 · 7 likes Coming back to post #27, because the follow-up matters more than the original answer. Reading old certificates: if a certificate is dated years ago, the lot it…
Reading a trial's population section before its results Replied, post #61 · Evidence › Trials · 28 May 2026 · 30 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.
Forced degradation studies: designing one that is informative Replied, post #53 · Analytics › Method validation · 10 May 2026 · 20 likes On post #49 — agreed on the reasoning, with one qualification. Why two laboratories may disagree: after validating the same method, they may still report different…
Why chargeback is not the safety net people assume Replied, post #12 · Sourcing › Payments · 5 May 2026 · 18 likes Bank transfer and finality: once a bank transfer is sent, it is final. The money is gone. There is no recourse with the bank if the supplier disappears. That is why…
Reimbursement variation across member states Replied, post #2 · Regional › European Union · 30 Apr 2026 · 10 likes Pharmacy practice: pharmacies in different EU countries differ in conservatism about irregular prescriptions. Some will decline a prescription they consider irregular;…
Fasting versus non-fasting and which tests care Replied, post #20 · Clinical › Bloodwork · 29 Apr 2026 · 6 likes On post #16 — agreed on the reasoning, with one qualification. HbA1c and glucose: HbA1c reflects average glucose over months; a spot glucose measurement reflects the…
[2026 update] 0.3 mL versus 0.5 mL versus 1 mL barrels: resolution matters Replied, post #52 · Devices › Syringes & needles · 22 Apr 2026 · 27 likes Reading units correctly: look at the marking from the side, not from above or below. The bottom of the plunger tip is the reading. Parallax error (wrong angle) is a…
Reading a home test result without over-claiming Replied, post #9 · Analytics › Home & field testing · 10 Apr 2026 · 14 likes I read post #7 twice before replying, because I had assumed the opposite. False positives and false negatives: no test has 100% sensitivity and 100% specificity. A…
Grapefruit: why this class is not the class that cares Replied, post #113 · Practice › Interactions · 3 Apr 2026 · 10 likes Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side effects can overlap and additive. Taking them separately or…
The "under review" status pill and when a moderator applies it Replied, post #50 · Evidence › Preprints · 2 Apr 2026 · 18 likes Preprints for speed: some important preliminary findings are posted as preprints to disseminate quickly. That speed is useful but comes at the cost of not yet having…
Second pass at: Adsorptive losses at low concentration, and why dilute solutions are… Replied, post #76 · Practice › Storage & stability · 28 Mar 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…
Anaesthesia and elective surgery: the aspiration question Replied, post #47 · Practice › Interactions · 11 Mar 2026 · 16 likes Supplements and herbs: many have no established interaction. Some do. If you are taking something unusual, checking a reference (like a pharmacist) is more useful than…
Revisiting: A page that has drifted out of date and needs a maintainer Replied, post #93 · Documentation › Wiki requests · 17 Feb 2026 · 15 likes This follows post #90 rather than contradicting it. Authority and authorship: if you think a maintained page needs input from someone with specific expertise (a…
Foaming during reconstitution and whether it matters — the long version Replied, post #36 · Practice › Reconstitution · 16 Feb 2026 · 28 likes On post #32 — agreed on the reasoning, with one qualification. The decimal-point error: computing 5 mg / 2 mL as 0.25 mg/mL instead of 2.5 mg/mL is the most common…
[2026 update] Reading a supplementary appendix and finding the interesting part Replied, post #20 · Evidence › Trials · 26 Jan 2026 · 0 likes Population narrowness: most trials in this class enrolled fairly specific groups. Baseline body mass index ranges, exclusion of renal disease, exclusion of certain…
Introducing myself: pharmacist, sceptic, reluctant participant Replied, post #3 · Lounge › Introductions · 9 Jan 2026 · 0 likes Coming back to the opening post, because the follow-up matters more than the original answer. Say hello. No question required. Introduce yourself if you want to give…
A history of disordered eating: proceeding carefully Replied, post #49 · Wellbeing › Mental health · 3 Jan 2026 · 22 likes I read post #47 twice before replying, because I had assumed the opposite. Identity and self-image: for some people, weight and body size are central to identity. Large…
Travelling with an injectable: documentation and practicalities Replied, post #3 · Access › International · 24 Dec 2025 · 24 likes Picking up post #2: that is the part I would want checked first. Import rules for personal use: what you can import for personal use depends on your country's rules,…
What a regulator's shortage notice actually authorises — what changed since Replied, post #26 · Sourcing › Regulatory · 22 Dec 2025 · 25 likes This follows post #23 rather than contradicting it. Approval versus licensing: a compound can be approved for a specific indication in one country and not approved at…
Coming back to: What the published dose-response for semaglutide actually looks like… Replied, post #3 · Compounds › Semaglutide · 16 Dec 2025 · 6 likes The mass figure differs between sources because of how the different entities report it. The monoisotopic mass of the bare peptide is one number; the mass including the…
Temperature loggers worth the money — the long version Replied, post #89 · Devices › Cold chain · 8 Dec 2025 · 14 likes Temperature excursions: brief excursions above 8 °C are tolerable for most compounds. Hours to a day at room temperature is usually acceptable. Days to weeks at room…
Second pass at: Circumference measurements as a poor man's composition estimate Replied, post #24 · Outcomes › Body composition · 8 Dec 2025 · 0 likes post #23 is right about the mechanism and I think understates the practical bit. Visceral fat: DXA does not distinguish visceral (organ-associated) fat from…
Tirzepatide in type 2 diabetes: the SURPASS programme, summarised honestly — the long… Replied, post #45 · Compounds › Tirzepatide · 6 Dec 2025 · 1 like Half-life difference: tirzepatide is about 5 days versus semaglutide's week-long. Practically, that means steady state is reached slightly faster and the post-dose…
Second pass at: The topic list is dense — is that deliberate? Replied, post #11 · Meta › Site feedback · 1 Dec 2025 · 0 likes Moderation decisions: if you disagree with a moderation decision, raising it here gives it visibility. Staff will reconsider if you make a substantive case.
Availability by country, dated, with primary sources Replied, post #74 · Access › International · 24 Nov 2025 · 21 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…
Revisiting: Aggregates and why a purity assay may miss them entirely Replied, post #27 · Analytics › Impurities & related substances · 19 Nov 2025 · 1 like Residual solvents: traces of solvents used in purification. These are usually tested by gas chromatography, not by HPLC. A specification for residual solvents should be…
Revisiting: Why tirzepatide titration schedules have more steps than semaglutide's Replied, post #101 · Compounds › Tirzepatide · 18 Nov 2025 · 16 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…
A parcel that arrived warm: a decision process, not a verdict Replied, post #141 · Practice › Storage & stability · 15 Nov 2025 · 0 likes post #140 is right about the mechanism and I think understates the practical bit. I want to gently push back on the reply above about storage extrapolation. The advice…
[2026 update] What a good consultation looks like from the other side Replied, post #2 · Clinical › Prescriber conversations · 28 Oct 2025 · 13 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
Thyroid function tests during substantial weight change Replied, post #104 · Clinical › Bloodwork · 21 Oct 2025 · 29 likes This follows post #101 rather than contradicting it. Liver enzymes: elevation does not specify cause. ALT and AST can rise from many things. Bilirubin helps narrow down…
Follow-up: The decimal-point error, and the habit that catches it Replied, post #66 · Practice › Reconstitution · 25 Sep 2025 · 32 likes A vial that will not fully dissolve: check in order: is the diluent genuinely room temperature (some preservatives crystallise in cold), is the vial being warmed gently…
Older adults, sarcopenia risk, and the trade-off nobody quantifies Replied, post #2 · Clinical › Special populations · 19 Sep 2025 · 6 likes Disordered eating history: a history of anorexia nervosa, bulimia, or other eating disorders changes the risk-benefit calculation because appetite suppression might…
A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #128 · Practice › Reconstitution · 19 Sep 2025 · 2 likes I read post #126 twice before replying, because I had assumed the opposite. Arithmetic step by step: a 5 mg vial with 2 mL of diluent gives (5 mg) / (2 mL) = 2.5 mg/mL.…
Titles that describe the question, not the situation — what changed since Replied, post #16 · Start Here › How to Ask · 15 Sep 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.
Aggregated purity results across four services, with caveats — a second dataset Replied, post #38 · Data & Tools › Datasets · 7 Sep 2025 · 0 likes Combining data from different sources: datasets from this site are not directly comparable to published trials because the populations are different. They are worth…
Hypertension improvement and when medication needs revisiting Replied, post #44 · Clinical › Comorbidities · 6 Sep 2025 · 0 likes post #43 answers the question as asked. The question underneath it is different. PCOS and metabolic overlap: polycystic ovary syndrome has metabolic overlap with…
Tirzepatide molecular mass and the charge states you would expect on ESI Replied, post #24 · Compounds › Tirzepatide · 27 Aug 2025 · 9 likes This follows post #21 rather than contradicting it. Half-life difference: tirzepatide is about 5 days versus semaglutide's week-long. Practically, that means steady…
Coming back to: Semaglutide half-life: where the 165 to 184 hour figure comes from Replied, post #107 · Compounds › Semaglutide · 7 Aug 2025 · 8 likes The STEP programme populations were selected: enrollment criteria required baseline body mass index over 30, no recent blood pressure crisis, no recent retinopathy, no…
Travel coolers and how long they really hold Replied, post #64 · Devices › Cold chain · 6 Aug 2025 · 0 likes Domestic refrigeration: most lyophilised peptides are stored at 2–8 °C (35–46 °F). That is standard refrigerator temperature. Check your refrigerator's actual…
How to research a compound with no human data without deceiving yourself Replied, post #61 · Compounds › Other compounds · 2 Aug 2025 · 21 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…
Power cut for eleven hours: how I assessed it afterwards Replied, post #6 · Practice › Storage & stability · 26 Jul 2025 · 0 likes On post #2 — agreed on the reasoning, with one qualification. I want to gently push back on the reply above about storage extrapolation. The advice is sound and the…
Canadian access and provincial variation — one year on Replied, post #4 · Regional › North America · 18 Jul 2025 · 0 likes Regional variation in North America: access differs substantially by US state and Canadian province. Postcode is a major determinant of access.
Antibiotics and a course of something with delayed emptying Replied, post #77 · Practice › Interactions · 29 Jun 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.
"Greater than or equal to 99%" as a specification rather than a result Replied, post #2 · Analytics › COA interpretation · 28 Jun 2025 · 0 likes When a document puts the specification in the result column, it has told you the release criterion, not the measurement. Those are different claims and the second is…
Publishing an inconvenient result: a case study Replied, post #37 · Sourcing › Independent verification · 21 Jun 2025 · 0 likes Janoshik Analytical: chromatographic purity and mass-spectrometric identity on submitted samples. Reports are issued with the analytical method stated and a…
Coming back to: Official shortage notices and what they authorise Replied, post #33 · Access › Shortages · 18 Jun 2025 · 25 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.
[2026 update] What the GIP component of tirzepatide is thought to contribute, and how… Replied, post #64 · Compounds › Tirzepatide · 2 Jun 2025 · 3 likes post #63 answers the question as asked. The question underneath it is different. Nausea profile: some people report tirzepatide as less nausea-prone than semaglutide,…
Half-life, steady state, and accumulation worked through Replied, post #2 · Pharmacology › Pharmacokinetics · 19 May 2025 · 18 likes Hepatic metabolism: the degree to which each compound is hepatically metabolised versus renally cleared is known but varies. Severe liver disease changes clearance.
A page that has drifted out of date and needs a maintainer Replied, post #103 · Documentation › Wiki requests · 14 May 2025 · 0 likes Scope creep: if you think a page is attempting too much and should be split into multiple pages, that is a reasonable suggestion.
UK access routes, dated and sourced — a second dataset Replied, post #75 · Regional › UK & Ireland · 9 May 2025 · 8 likes Importing for personal use: importing a prescription-only medicine without a prescription is not lawful. Material sold as research-use-only is not a licensed medicine…
DXA precision and the least significant change for lean mass — the long version Replied, post #4 · Outcomes › Body composition · 4 May 2025 · 14 likes On post #2 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what you…
An emergency department visit, described afterwards Replied, post #15 · Safety › Adverse events · 27 Apr 2025 · 29 likes post #14 answers the question as asked. The question underneath it is different. Acute kidney injury: rare but reported. Symptoms (decreased urine output, creatinine…
Review: a draft on reconstitution arithmetic, with objections Replied, post #112 · Documentation › Doc review · 18 Apr 2025 · 0 likes Interdependencies: if updating one page requires updating related pages, posting that connection here helps the maintainers see the scope of work.
Adjudicated events and why the definition matters — the long version Replied, post #105 · Evidence › Trials · 18 Apr 2025 · 1 like post #104 is right about the mechanism and I think understates the practical bit. Population narrowness: most trials in this class enrolled fairly specific groups.…
Adjudicated events and why the definition matters — the long version Replied, post #100 · Evidence › Trials · 15 Apr 2025 · 15 likes Risk of bias: structured appraisal of internal validity. Key things to assess: randomisation method (was it truly random or could someone predict the next assignment),…
A report I filed that turned out to be wrong, and the correction Replied, post #14 · Sourcing › Vendor reports · 14 Apr 2025 · 3 likes I read post #12 twice before replying, because I had assumed the opposite. Blind submission is worth the effort: have someone else relabel the sample so neither you nor…
Distinguishing a deletion sequence by mass alone — the long version Replied, post #14 · Analytics › Mass spectrometry · 12 Apr 2025 · 0 likes This follows post #11 rather than contradicting it. Resolution: "high resolution" commonly means
A certificate with no method stated: what can you conclude? Replied, post #52 · Analytics › COA interpretation · 10 Apr 2025 · 0 likes On post #48 — agreed on the reasoning, with one qualification. Water content (residual moisture) matters: lyophilised peptide is not dry. A few percent water is normal.…
Review cadence: how often is a page actually re-checked? Replied, post #4 · Documentation › Doc review · 30 Mar 2025 · 0 likes New maintainer recruitment: if a page's maintainer is inactive and updates are needed, suggesting a new maintainer here can help transition responsibility.
Why fasting instructions for oral semaglutide are not optional advice — does this still… Replied, post #4 · Compounds › Oral incretins · 8 Mar 2025 · 0 likes Fasting instructions are not optional advice. Taking the tablet with food or with more than a sip of water measurably reduces absorption. This is the one compound in…
Validating a method you did not develop — does this still hold? Replied, post #82 · Analytics › Method validation · 7 Mar 2025 · 8 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.
Random versus fixed effects: choosing rather than defaulting — a second dataset Replied, post #76 · Evidence › Meta-analyses · 8 Feb 2025 · 0 likes Picking up post #73: that is the part I would want checked first. Fixed-effects versus random-effects models: fixed-effects assumes all studies are estimating the same…
Scheduled maintenance and what will be unavailable Replied, post #35 · Meta › Announcements · 6 Feb 2025 · 0 likes RSS: if you prefer to receive announcements by feed rather than visiting the site, RSS is available for this subcategory.
[2026 update] New subcategory: rationale and scope Replied, post #148 · Meta › Announcements · 14 Jan 2025 · 0 likes On post #144 — agreed on the reasoning, with one qualification. Staff-only posts: some announcements are visible only to staff (concerning internal operations). Members…
Gallbladder disease risk with rapid weight loss Replied, post #56 · Clinical › Comorbidities · 12 Jan 2025 · 7 likes Obstructive sleep apnoea: SURMOUNT-OSA used an objective endpoint, the apnoea-hypopnoea index. Reduction was substantial. Whether the benefit is weight loss or a direct…
Revisiting: What a well-designed human trial of a secretagogue would look like Replied, post #19 · Compounds › Secretagogues & GH axis · 6 Jan 2025 · 9 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…
Specification in the result column: why that is a meaningful error — the long version Replied, post #6 · Analytics › COA interpretation · 3 Jan 2025 · 0 likes post #5 answers the question as asked. The question underneath it is different. What fields matter on a certificate: lot number matching the vial, test date, the…
Building a sensible monitoring schedule with your prescriber Replied, post #55 · Clinical › Bloodwork · 20 Dec 2024 · 14 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.
What we do not know about retatrutide, listed explicitly Replied, post #22 · Compounds › Retatrutide · 15 Dec 2024 · 7 likes Picking up post #19: that is the part I would want checked first. What we do not know about retatrutide, listed explicitly: long-term safety, real-world response rates,…
Body image changing more slowly than the body Replied, post #33 · Wellbeing › Mental health · 14 Dec 2024 · 19 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…
Type 1 diabetes: off-label use and the evidence gap — what changed since Replied, post #76 · Clinical › Special populations · 26 Nov 2024 · 10 likes Older adults: sarcopenia risk is higher, polypharmacy is common, and the clinical trials did not enroll many people over 75. Extrapolating to very old people is…
Why "any advice?" is the least effective ending for a post Replied, post #73 · Start Here › How to Ask · 25 Nov 2024 · 6 likes Context that matters: compound, how long in, current dose, relevant history. Context that does not matter: how you feel, your hopes for the outcome, your medical…
Criticising the method without criticising the authors Replied, post #13 · Evidence › Study critique · 26 Oct 2024 · 11 likes Building consensus on which criticisms matter: if everyone agrees that the sample size is small but only you think that affects the conclusion, maybe your criticism is…
Follow-up: Oral contraceptives and delayed emptying: what the data shows Replied, post #18 · Practice › Interactions · 4 Oct 2024 · 18 likes Worth separating two things that post #14 runs together. Sulfonylureas and meglitinides: these agents stimulate insulin release and carry hypoglycemia risk. Combining…
Circumference measurements as a poor man's composition estimate Replied, post #60 · Outcomes › Body composition · 12 Aug 2024 · 0 likes This follows post #57 rather than contradicting it. For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add…
Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Started this topic · Practice › Dosing & titration · 6 Jul 2024 · 3 likes Posting this under the heading it deserves: Splitting a weekly dose in two: the pharmacokinetic argument against — the long version Everything below is what sits behind…