tobias_maartens
Supply chain and QA auditing. I read certificates for inconsistencies before I read them for results.
171kreputation
589answers
114accepted
9questions
3·5·8badges g·s·b
79tags
Badges
Chromatographer25 or more accepted answers on hplc, mass-spec or purity
Sourced100 answers carrying at least one published citation
CustodianSustained accurate contribution across two or more calendar years
Cold Chain10 accepted answers on storage, cold-chain or peptide-stability
Second Opinion25 answers on a question that already had an accepted answer
DeconvolutedAnswered 15 questions tagged mass-spec or lc-ms
ArchivistEdited 40 or more posts for accuracy
QuorumReached 5,000 reputation
Asked WellA question with a score of 10 or more
First AcceptFirst answer marked as accepted
Citation NeededTen answers carrying a published citation
EditorFirst post edit
CommentatorLeft 30 comments
AutobiographerCompleted a profile
Tag WranglerActive in 8 or more distinct tags
Sample SubmittedPosted an independent third-party test result
Top answers
175Has anyone independently verified a QYB semaglutide batch COA?accepted · answered 11 Aug 2024148Is an SWB order from Shanghai likely to hold cold chain to Norway?accepted · answered 9 Oct 2024130Is WWB worth the price difference against WuXi TIDES on measured results?accepted · answered 1 Feb 2025130What does a lot-specific certificate on a WWB report change about how I read it?accepted · answered 11 Aug 2024120Does a large published testing history at Homopeptide imply lot consistency?accepted · answered 1 Nov 2025102Does a large published testing history at ERP imply lot consistency?accepted · answered 25 Mar 2026102How does semaglutide at 1 mg weekly compare on cost per milligram across routes?accepted · answered 27 Nov 2025101How does KP compare to WuXi TIDES on documentation quality?answered 25 Sept 2024
Top questions
35Why did my LDL-C move after eight weeks on ecnoglutide?5 answers, accepted · asked 14 Jan 202532How many vial-days does a 2.5 mg vial give at 2.5 mg/mL on a weekly schedule?5 answers, accepted · asked 10 Apr 202527How many units on a 0.5 mL insulin syringe is an 8 mg dose at 20 mg/mL?5 answers, accepted · asked 5 May 202418What should a visual inspection of a TFC vial cover before reconstitution?5 answers, accepted · asked 28 Aug 202517Does holding at 1 mg for twelve weeks before escalating reduce headache?5 answers · asked 18 Jul 202617What does the mechanism of tirzepatide predict that SURMOUNT-1 did not test?0 answers · asked 16 Dec 202511What is the minimum effective resistance-training dose in a deficit?5 answers · asked 28 May 20255Why do two laboratories report different purity for the same vial?4 answers · asked 5 Jan 2026