Endotoxin testing methods — what worked for you?

pat_auckland said:

I tested my certificates of analysis batch through Janoshik — 97.0% purity.

Second this. The detail I would add is minor and it is already implied above.

From the other side of the consultation, briefly.

Vendor quality matters when discussing certificates of analysis. I've tested my last 3 batches through Janoshik and purity has ranged from 97.2% to 99.4%. Consistency is key.

For anyone new: always request the COA, and consider independent verification. The $300 for a Janoshik test is worth the peace of mind.

roxy_nash said:

Vendor quality matters when discussing certificates of analysis.

Can confirm. Same sequence, different timescale. Posting only so the count is not one.

roxy_nash said:

Vendor quality matters when discussing certificates of analysis.

Community-verified vendors for certificates of analysis: I maintain a spreadsheet of Janoshik-verified test results submitted by community members. Across 55 submitted tests:

• 75% tested at ≥98% purity
• 18% tested at 95-98% purity
• 7% tested at <95% purity (concerning)

The vendors with consistently high purity results are listed in the Vendor Directory. We update monthly based on new community submissions.

Moderator note: reminder that nothing in this thread is medical advice, and that clinical claims need a source.