Independent Collagen Testing: Understanding the Results and What They Mean
Transparency matters to us at Nutraviva. When questions were raised about bovine collagen molecular weight and testing results, we chose to take a deeper look, independently, carefully, and with the right analytical tools.
This article explains what we tested, what we found, and why different collagen tests can produce different numbers, without the noise.
Why we commissioned independent testing
Collagen is not a simple ingredient; it’s a naturally complex composition of amino acids.
When bovine collagen molecular weight results from a testing method were published publicly, we wanted to ensure we fully understood the data, not just for ourselves, but for our customers and stockists.
So, we commissioned independent, high-resolution testing to review our bovine collagen powder correctly and transparently.
How our bovine collagen was tested
We engaged MtoZ Biolabs (USA), an independent specialist proteomics contract research organisation, to analyse multiple batches of:
- Nutraviva Australian Collagen Hydrolysate
- Nutraviva Collagen Hydrolysate (Brazilian sourced)
The testing used high-resolution SEC-HPLC, with calibration appropriate for collagen peptides. Importantly, we requested that results be reported using the same molecular weight banding as the earlier testing, so the data could be compared like-for-like.
This step is critical because not all tests measure hydrolysed collagen powders with accuracy.
What our independent testing showed
Nutraviva Australian Collagen
💠~62% of peptides ≤ 5 kDa (independent SEC-HPLC)
💠Earlier testing reported ~16.5% ≤ 5 kDa
Nutraviva Collagen Hydrolysate (Brazilian sourced)
💠~37% of peptides ≤ 5 kDa
💠Earlier testing reported ~12%
These differences are explained by analytical resolution, particularly the ability (or inability) to accurately detect peptides below 2.5 kDa.
When collagen is analysed using higher-resolution methods designed for small peptides, the results align with the specifications for our hydrolysed collagen powders.
What this means for absorption and bioavailability
Here’s an important takeaway: ingested collagen does not absorb into the body as large peptides. Regardless of starting molecular weight, collagen is digested into small bioactive peptides such as proline, glycine and hydroxyproline, before absorption. Human studies consistently show these peptides appear in the bloodstream within 30–60 minutes after ingestion.
Hydrolysed collagen has an excellent safety record and is widely used in both everyday nutrition and specialised formulations. Where sensitivities have been reported, they are most commonly linked to histamine accumulation from prolonged processing, or sulphite residues (where used during manufacturing). These reactions typically occur in individuals with clinically diagnosed sensitivities and are considered uncommon. They are not related to collagen peptide size.
We stand behind and remain confident in the quality, safety, bioavailability and integrity of all of our product range.
Rather than relying on unsubstantiated rankings or rigid cut-offs, we believe in:
✔ independent verification
✔ appropriate testing methods
✔ transparency
✔ and evidence-based nutrition
If you’d like to review the independent testing summary in more detail, you’ll find our results below:
Independent Collagen Testing Summary and Methodology
Independent Testing SEC_HPLC Analysis Report
Disclaimer: As with any dietary choice, it's essential to strike a balance. A varied and balanced diet, coupled with a healthy lifestyle, is key to overall well-being. This content is for informational purposes only and does not constitute medical advice. Consult with your Doctor or healthcare professional regarding your individual health needs before making any changes to your health routine or starting any new dietary supplements.