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While no official weight-based protocol exists for retatrutide, the pharmacological principle is straightforward: a larger body distributes the same dose across more tissue, resulting in lower effective tissue concentration

Test before you start and again at 46 weeks

Practical tips for the test To get the most out of this insightful test, keep the following in mind: No need to take a break from supplements: Unlike with the serum test, you usually don't need to stop taking B12 supplements

The presence of elevated B12 should prompt clinicians to consider these differential diagnoses rather than attributing elevation solely to supplementation