Independent third-party lab testing for popular Methylene Blue supplements is underway! We are partnering with Beaconpoint Labs, a trusted laboratory, to analyze these products for purity and safety.
The tests will include:
✔ Heavy Metals
✔ Residual Solvents
✔ Microbial Contaminants
This initial project is being crowdfunded through GoFundMe here, and we greatly appreciate all the donations so far! In the near future, we plan to offer crowdfunding directly on our website using a built-in feature, making it easier for the community to fund independent lab tests without relying on third-party platforms. Please bookmark this post on reddit to stay updated on the lab testing.
Lab Test Results
Beaconpoint-Labs-Meraki-Methylene-Blue-FinalA Few Notes on the Results
- APC is a measure of the total aerobic bacteria count in the sample.
- The APC (aerobic plate count) came back at 11,000 CFU/mL.
I followed up with the lab to understand this result. They confirmed it’s accurate and explained that for finished products consumed as-is, many of their clients aim for 1,000–10,000 CFU/g or mL, depending on the serving size. For raw materials or supplements that are diluted before use, acceptable ranges are sometimes broader — up to 10,000–100,000 CFU/g or mL.
What Meraki States
The company states on their site that their products are “certified pharma grade”, “pharmaceutical-grade Methylene Blue,” “USP-grade” and “Pharmaceutical-grade purity (USP standard).”
Official USP Standards & Verification
USP stands for the United States Pharmacopeia — an independent, scientific nonprofit that sets quality, purity, strength, and safety standards for medicines, dietary supplements, and food ingredients.
USP Verified is a rigorous certification program. It includes:
- Independent ingredient testing to confirm purity, strength, and quality
- Audits of the manufacturing facility
- Contaminant testing, including microbial counts, heavy metals, etc.
- Random off-the-shelf testing for ongoing quality control
Only products that pass this full process can display the USP Verified Mark — a gold badge you may have seen on some supplements. You can look up USP-verified products here.
USP Standards for Oral Liquid Supplements
Given that, I looked into the USP standards for microbial limits in oral liquid supplements. According to USP <1111>:
- Total aerobic microbial count (TAMC) should not exceed 100 CFU/mL
- Yeasts and molds (TYMC) should be ≤10 CFU/mL
- E. coli and other pathogens must be absent in 1 mL
You can read more about USP microbial limits here: https://microbe-investigations.com/usp-1111/.
Testing on the Final Product Versus Raw Materials
Meraki shares two lab reports on their site — it appears that both are for powder, not the actual liquid product people consume. We know this because:
- The reports list CFU/g (used for solids), not CFU/mL (used for liquids)
- The other report lists the sample type as “Powder”
Testing powder doesn’t reflect what ends up in the bottle. Contamination can occur during production, mixing, bottling, or shipping — especially in liquid supplements.
To evaluate microbial safety, testing must be done on the finished liquid product, which is what I had tested.
This post shares lab results and public information for transparency. If you have questions about product quality or compliance, it may be helpful to contact the company directly and ask how they verify their USP and pharma-grade claims.
Lab Results Posted to the Meraki Site, as of 4-25-25
