The key ingredients are listed below:

L-Arginine Base
The direct substrate for endothelial nitric oxide synthase (eNOS) — the enzyme that produces nitric oxide in vascular and prostate smooth muscle. L-arginine as a precursor of NO can improve urinary conditions via the NO pathway, with a published study concluding that L-arginine alone might mitigate BPH symptoms through smooth muscle relaxation. L-Arginine Base provides the most direct and rapidly available form for immediate NO synthesis. 

L-Arginine AKG 2:1 Extract (Alpha-Ketoglutarate)
The enhanced-bioavailability form of arginine. The Alpha-Ketoglutarate salt improves arginine’s absorption characteristics — allowing more active compound to reach the bloodstream and prostatic vascular tissue before hepatic degradation. This form is specifically chosen for superior delivery kinetics compared to free-form arginine alone.

L-Citrulline HCl
The sustained NO precursor with superior bioavailability over oral arginine. The use of natural arginase inhibitors such as L-citrulline increases L-arginine bioavailability to endothelial nitric oxide synthase (NOS) and thus improves NO formation for maintaining optimal cardiovascular antioxidant protection. L-Citrulline converts to L-Arginine in the kidneys — bypassing hepatic first-pass metabolism — sustaining plasma arginine and NO levels for hours after supplementation.

L-Citrulline Malate
The performance-optimized dual-action form. Pairs L-Citrulline’s sustained NO precursor activity with malic acid — a Krebs cycle intermediate that directly supports cellular ATP production. This provides both prolonged NO elevation and metabolic energy support to the smooth muscle cells of the prostate and urinary tract simultaneously.

Niacin (Vitamin B3)
A well-established vasodilator that works through prostaglandin-mediated smooth muscle relaxation — a mechanism entirely distinct from the NO pathway. Niacin’s vasodilatory action expands peripheral and pelvic blood vessels, supporting the microcirculation that delivers oxygen and nutrients to prostate and urinary tract tissues, and reducing the tissue congestion that contributes to urinary discomfort.

Calcium (as Calcium Carbonate)
Calcium plays a critical role in smooth muscle physiology — specifically in regulating the balance between smooth muscle contraction and relaxation. In urinary tract smooth muscle, calcium signaling determines how effectively muscles can relax during urination. Adequate calcium cofactor support helps maintain the responsive, well-regulated smooth muscle function that comfortable urinary flow requires.

Beta-Alanine
Beta-Alanine’s primary role in Prosta Flow is carnosine elevation. Beyond its well-known muscle buffering effects, carnosine functions as an endogenous tissue antioxidant and anti-glycation agent. The same age-related changes that affect the prostate also affect blood flow and tissue health — and anti-inflammatory support at the tissue level complements the formula’s primary vascular mechanisms. Carnosine’s anti-inflammatory properties in pelvic tissues add a neuroprotective and tissue-supportive dimension to the formula’s overall approach.