Hormones

Prolactin

Measured in ng/mL · LOINC 2842-3

Reference ranges

Optimal

4 – 12 ng/mL

functional-medicine target

Standard

4 – 15 ng/mL

lab reference range

Optimal ranges are tighter than standard lab ranges and reflect functional-medicine targets, not the populations they were derived from. Reference bands depend on sex, age, and circumstance — Juno's lab analysis layers your profile context onto the printed range when you paste a value.

Peptide relevance

Elevated prolactin (>15-20 ng/mL in men, >25 ng/mL in non-pregnant women) can indicate pituitary adenoma, hypothyroidism, drug effect (antipsychotics, opioids, some antidepressants), or recent stress/nipple stimulation. Suppresses libido and fertility in both sexes. PEPTIDE INTERACTIONS: 19-nor-progestational AAS (NOT peptides, common co-use) like nandrolone are notorious for raising prolactin — flagged for users disclosing AAS use. PT-141 and oxytocin (peptides) transiently raise prolactin around dosing. Kisspeptin can transiently raise prolactin in some studies. CJC-1295 + Ipamorelin: minimal effect. KEY CAVEATS: morning fasting draw; avoid stress, exercise, and nipple stimulation in the prior hour. Cabergoline is the standard treatment for elevated prolactin.

Peptides that influence this marker

Documented to affect this marker. Click through for the full evidence-tiered profile.

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