Prolactin: Functions, Normal Ranges, and Clinical Significance

Prolactin is a hormone produced by the pituitary gland that plays a vital role in reproductive health and various physiological processes.

Functions of Prolactin

• In Women: Primarily responsible for breast development and milk production, with levels rising during pregnancy and peaking at delivery.
• In Men: Contributes to reproductive function, though its role is less pronounced.
• In Both Genders: Can fluctuate due to nipple stimulation, breastfeeding, and physical or emotional stress.

Normal Prolactin Ranges (ng/mL)

Prolactin Levels During Puberty (Tanner Stages) (ng/mL)

When prolactin levels exceed normal ranges, a condition called hyperprolactinemia may develop, potentially indicating underlying health conditions that require medical evaluation. Monitoring prolactin levels is crucial for diagnosing and managing hormonal imbalances that affect fertility, metabolism, and overall endocrine health.

Prolactin is a hormone produced by the pituitary gland that causes breast development in women and milk production in pregnant women. Prolactin does not have known biological function in men.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid.

Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage.

Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn.

Proline is a nonessential amino acid, which means that it is manufactured from other amino acids in the liver; it does not have to be obtained directly through the diet.

Proline is the precursor to hydroxyproline, which is a major amino acid found in the connective tissue of the body – collagen.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid. Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage. Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn. In addition to dietary sources, proline can be synthesized from glutamate/glutamine, arginine, and ornithine. It can also be synthesized within enterocytes from degradation of small peptides.

Collagen Catabolism: Collagen contains proline, hydroxyproline, and glycine.

→ Sarcopenia (low muscle mass) was associated with higher plasma proline.

→ Proline was significantly lower in esophageal cancer patients compared to the healthy controls.

→ Hydroxyproline and proline together constitute around 25% of residues and allow for stability and twisting of collagen.

→ Dietary intake increases levels of proline and hydroxyproline.

→ Proline and hydroxyproline both negatively correlated with a higher likelihood of anxiety, depression, and psychoses.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid.

Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage.

Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid. Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage. Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn. In addition to dietary sources, proline can be synthesized from glutamate/glutamine, arginine, and ornithine. It can also be synthesized within enterocytes from degradation of small peptides.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid.

Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage.

Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid. Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage. Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn. In addition to dietary sources, proline can be synthesized from glutamate/glutamine, arginine, and ornithine. It can also be synthesized within enterocytes from degradation of small peptides.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid. Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage. Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn. In addition to dietary sources, proline can be synthesized from glutamate/glutamine, arginine, and ornithine. It can also be synthesized within enterocytes from degradation of small peptides.

Proline is a nonessential amino acid. It contains a secondary α-imino group and is sometimes called an α-imino acid. Proline, and its metabolite hydroxyproline, constitute a third of the total amino acids found in collagen. Lysine, proline, hydroxyproline, and vitamin C are all important in the synthesis of collagen for skin, bones, tendons, and cartilage. Proline is abundant in meat, bone meal, poultry, salmon, wheat, barley, and corn. In addition to dietary sources, proline can be synthesized from glutamate/glutamine, arginine, and ornithine. It can also be synthesized within enterocytes from degradation of small peptides.

Proline is a nonessential amino acid, which means that it is manufactured from other amino acids in the liver; it does not have to be obtained directly through the diet.

Proline is the precursor to hydroxyproline, which is a major amino acid found in the connective tissue of the body – collagen.

Proline is a nonessential amino acid that plays a key role in the structure and stability of collagen. It contains a unique secondary α-imino group, which is why it’s sometimes referred to as an α-imino acid. Together with its metabolite hydroxyproline, proline makes up roughly one-third of the amino acids in collagen, providing strength and flexibility to skin, bones, tendons, and cartilage.

Lysine, proline, hydroxyproline, and vitamin C are all essential for healthy collagen synthesis and connective tissue repair. Proline is abundant in meat, poultry, salmon, bone broth, wheat, barley, and corn, and can also be synthesized by the body from glutamate (or glutamine), arginine, and ornithine. Additionally, intestinal cells (enterocytes) can produce proline through the breakdown of small peptides.

Proline is a nonessential amino acid, which means that it is manufactured from other amino acids in the liver; it does not have to be obtained directly through the diet.

Proline is the precursor to hydroxyproline, which is a major amino acid found in the connective tissue of the body – collagen.

Procollagen I intact N-terminal propeptide (PINP) values should not be used as a screening test for osteoporosis in the general population. PINP is used to monitor bone formation and antiresorptive therapies. PINP should be measured prior to the start of therapy to determine a baseline value and again at 3 to 6 months after initiation of therapy. Therapeutic response is evaluated by comparing pre and post-treatment values.

Propionate is among the most common short-chain fatty acids produced in the human gut in response to indigestible carbohydrates (fiber) in the diet.