A formal incretin analysis in humans was published in December of 1987 from Steven Blooms laboratory [32], clearly demonstrating the incretin-like insulinotropic potential of GLP-1, which was actually greater than that of GIP studied in the same experiments
But there is still a lot we dont know about how some drugs used for weight loss may reduce the effects of birth control pills, and why tirzepatide is the only one of these drugs that carries a warning specifically tied to birth control
When cultured human L-cells were deprived overnight of glucose and serum and then exposed to high glucose, 10% FBS, and -carrageenan (1 g/ml) for 10 minutes, 1 h, and 24 h, mRNA expression of proglucagon and secretion of GLP-1 were significantly reduced, compared to control cells not exposed to carrageenan
While some patients observe noticeable changes within the first 3 weeks, it may take up to several weeks and months, depending on an individuals health and metabolism