Oral capsules, Russian worker study
Who: Locomotive crew workers in a Russian study (group size not given in the abstract)
Note: The only human dose we found stated in PubMed. The abstract gives no group size or control. The retail supplement label says 1 to 2 capsules 1 to 2 times a day with meals for 10 to 30 days, repeated after 4 to 6 months, without stating the peptide amount.