Leptin resistance is often seen in people who are obese (with abundant leptin-secreting fat cells), but it can occur in non-obese people
Additionally, many of the currently available clinical agents display the always on characteristic, where they illuminate disease sites through self-accumulation rather than being specifically activated by target molecules of interest, which leads to poor imaging contrast and compromised detection accuracy
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The compound progressed through Phase 2 trials under multiple sponsors for postoperative ileus and related gastric-motility indications but did not advance to a marketed therapeutic
10.7759/cureus.44924 18 ChenS.WangX.LiuZ.WangJ.GuoY.WangQ.et al (2023)
Using expired b12 could certainly result in you not receiving the proper dosage due to deterioration as you now likely suspect given your setback