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A deficiency of NAD+ may disrupt the circadian rhythm and result in effects such as daytime sleepiness, restless sleep, hormonal imbalances, and mood alterations, among others

Several methods are being developed to bypass the BBB

In PTSD mice models, trauma exposure increased tyrosine hydroxylase expression (the rate-limiting enzyme in catecholamine biosynthesis), elevating stress hormones epinephrine and norepinephrine in serum and colon, which upregulated claudin-2 expression, confirming gut barrier dysfunction (Yadav et al., 2023)

Retatrutide improves insulin sensitivity through GLP-1 and GIP pathways, while growth hormone can transiently increase insulin resistance