The 28-day rule is a safety standard based on the known efficacy of the preservative, and it should be strictly followed regardless of the waters appearance
558,559 However, SIRT1 and SIRT2 are generally reduced in ALS primary motor cortex while they are upregulated in the spinal cord in human post-mortem tissues
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The cheapest insurance against this is buying bacteriostatic water from a source that can confirm what's actually in the bottle manufacturer name, lot number, USP labeling, glass vial with metal-crimp seal, and the explicit "0.9% benzyl alcohol" line
This decreases insulin/IGF-1 signaling, a pathway associated with lifespan extension when moderately inhibited