Most of these are phages and prey on our gut microbes without affecting us directly (Cryan et al., 2019) but they nonetheless have been reported to affect their hosts gut-blood barrier (Fitzgerald et al., 2019)
(These events are not well-reported for bacteriostatic water specifically, but benzyl alcohol hypersensitivity can occur.) Hemolysis (red blood cell destruction): Important: Bacteriostatic water is a hypotonic solution
Drmic et al., Celecoxib-induced gastrointestinal, liver and brain lesions in rats, counteraction by BPC 157 or L-arginine, aggravation by L-NAME, World J
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G., Roe, M
Mechanistically, this may relate to GHK-Cu's ability to upregulate matrix metalloproteinases (MMP-1, MMP-2), enzymes that can fragment collagen if their activity exceeds the body's ability to rebuild