Nettle Leaf

1. Inhibition of 5-Alpha Reductase

• The Mechanism: The hormone dihydrotestosterone (DHT) is a primary driver of prostate cell growth and tissue enlargement. The enzyme 5-alpha reductase converts free testosterone into DHT inside the prostate.
• Nettle's Action: Compounds in nettle extract help inhibit the 5-alpha reductase enzyme, reducing local DHT synthesis in prostate tissue and slowing down abnormal cell proliferation.

2. Disruption of SHBG and Hormone Binding

• The Mechanism: Sex Hormone-Binding Globulin (SHBG) is a blood protein that binds to testosterone and estrogen, delivering them to specific receptor sites on prostate cells to stimulate growth.
• Nettle's Action: Nettle extract contains lignans (such as (-)-3,4-divanillyltetrahydrofuran) that bind strongly to SHBG itself. By taking up these binding sites on SHBG, nettle prevents bound hormones from attaching to prostate cell membrane receptors, thereby blunting hormone-driven prostate expansion.

3. Aromatase Inhibition (Estrogen Regulation)

• The Mechanism: As men age, the ratio of estrogen to testosterone in the body increases. High estrogen activity in prostate tissue stimulates stromal cell growth and worsens BPH symptoms.
• Nettle's Action: Phytochemicals in nettle extract act as mild aromatase inhibitors (aromatase is the enzyme that converts testosterone into estrogen), helping maintain a healthier androgen-to-estrogen balance within the prostate microenvironment.

4. Anti-Inflammatory and Antioxidant Action

• The Mechanism: Chronic micro-inflammation within the prostate tissue contributes to lower urinary tract symptoms (LUTS), swelling, and cellular stress.
• Nettle's Action: Nettle leaf is naturally rich in flavonoids (like quercetin and rutin) and phenolic acids. It inhibits pro-inflammatory pathways—specifically suppressing cyclooxygenase (COX) enzymes, lipoxygenase (LOX) enzymes, and nuclear factor kappa B (NF-$\kappa$B)—which reduces tissue edema (swelling) and inflammation in the prostate and surrounding bladder neck.

Impact on Urinary Symptoms (LUTS)

• Improved Urinary Flow: Increases maximum urinary flow rate ($Q_{\max}$).
• Reduced Residual Volume: Helps the bladder empty more completely.
• Decreased Nocturia: Reduces the frequency of nighttime waking to urinate.
• Reduced Urgency & Hesitancy: Eases the difficulty in starting or maintaining a urine stream.