Evidence check: MC4R in the context of fertility

MC4R (melanocortin 4 receptor) is primarily known for its role in appetite regulation and energy balance. Some research suggests a link to reproductive function because the melanocortin pathway can influence GnRH secretion via leptin signaling. However, the evidence for a direct, clinically actionable role of MC4R variants in human fertility is weak. Most associations come from animal models or mechanistic studies; human GWAS show small effect sizes that are often not replicated. MyBody-X does not offer a specific MC4R test in the fertility context. Even if a DNA test covers MC4R, its interpretation for individual fertility counseling is not evidence-based. Clinical factors such as hormone levels, cycle regularity, and sperm quality are far more relevant. Therefore, the evidence level is mechanistic/unclear. Be cautious of marketing claims that label MC4R as a 'fertility gene'.