Steel Supplements Shredded-AF — tested by NSF International (Ann Arbor, MI) and RIVM (Bilthoven, NL)

Shredded-AF (Steel Supplements), tested by NSF International (Ann Arbor, MI) and RIVM (Bilthoven, NL).
This is an independent test. Whoever paid for it had no interest in the answer.

Analyte	Found
deterenol	15 mg, per serving (2 capsules)
phenpromethamine	1.3 mg, per serving (2 capsules)

Labelled as containing isopropylnorsynephrine (a deterenol synonym); no indication stated on the label. Cohen et al. 2021, Table 1: deterenol 15 ± 1.2 and phenpromethamine 1.3 ± 0.17 mg per serving; phenpromethamine was not declared. Sample purchased online April 2018. The same product name appears in FDA's May 2022 warning letter to Steel Supplements, Inc. for higenamine and hordenine.

Source: Peer-reviewed analysis

Measured and reported inside a peer-reviewed paper, which names its methods and reports what it found including the negatives. Cite the paper, and read its own account of how the samples were obtained.

Report: doi.org

This entry records one test of one sample. It is not a statement about any other batch, and it is not a safety assessment.