Stable Isotope Assays to Study Amino Acid Metabolism
We provide project design assistance and mass spectrometry services using stable isotope methods to researchers studying amino acid metabolism.
Trusted by Pharma and Biotech to Validate Mechanism of Action
35+ Years exclusively in stable isotope tracer studies
GLP-compliant, CLIA-certified, 21 CFR Part 11 validated
Consultative approach, with over 1,000+ studies guided from design to submission
Endpoints & Readouts
Amino Acid Metabolism Services
- Amino acid kinetics
- Amino acid oxidation to CO₂
- Transamination
- Metabolic fate of dietary amino acids
- Extracellular intermediates
Traditional nitrogen balance techniques overlook the dynamic nature of amino acid metabolism—the continuous breakdown, resynthesis, and recycling that sustain protein balance.
Stable isotope tracers transform amino acid research from static concentration data into a real-time view of metabolism.By labeling amino acids with 13C or 15N, we can follow their oxidation, transamination, and recycling across tissues—revealing how diet, disease, or therapeutic intervention reshape amino acid pathways. These insights provide the mechanistic clarity needed for confident clinical and regulatory decisions.
Assay Protocols Examples
The following examples offer useful protocols for studying aspects of amino acid metabolism and kinetics.
Amino Acid Metabolism
All Analyses Are Performed In Our Certified Laboratory Environment

Trusted by Leaders in Metabolic Research
From discovery to submission, we’ve earned the confidence of industry innovators through precision, speed, and scientific depth.
They’ve been very consistent… the sample analysis and data has always been timely and high quality.
There are academic labs that do it as well, but they’re much harder to engage and contract with.
I think they’re extremely organized and very on top of sample management. All the interactions that I’ve had with them have been great.
Frequently Asked Questions
Is this non-radioactive and patient-friendly?
Yes. 13C and 15N tracers are stable (non-radioactive) and safe for use in both preclinical and clinical studies. These tracers can be administered orally or intravenously, allowing repeated measurements of amino acid metabolism without radiation exposure.
Are methods inspection-ready?
Yes- all assays are performed in our GLP-compliant, CLIA certified laboratories. For clinical studies, assays can be further enhanced to include specific method validations, bioanalytical plans, multiple level QA reviews and a final report that is suitable for regulatory submission.
How fast can we start?
Typical start timeline: protocol design; kit build and site start-up are expedited. We provide early consultation to align tracer selection and sampling schedules with your study goals.
Who will I work with?
You’ll collaborate directly with our senior isotope scientists—the same experts who design, monitor, and interpret results for our pharmaceutical and academic partners. We stay hands-on throughout every stage of your study.
Measure Amino Acid Metabolism With Confidence
Confident decisions demand more than data. They require regulatory-ready insight you can trust.
Metabolic Solutions, LLC.
460 Amherst St., Nashua,
NH 03063, USA
Fax: (603) 598-6973
Hours of Operation
Monday – Friday
7:30 am – 6:00 pm EST