Amaranth
The Pharmacokinetics of Dietary Nitrates in Amaranth
Amaranth, particularly its leaves (often standardized in sports nutrition as red spinach extract), is one of the most concentrated botanical sources of dietary nitrate (NO3-). The primary mechanism of action for amaranth in cardiovascular and athletic contexts relies entirely on the nitrate-nitrite-nitric oxide (NO3- -> NO2- -> NO) reduction pathway. Unlike the endogenous production of nitric oxide via the endothelial nitric oxide synthase (eNOS) enzyme—which requires L-arginine and oxygen—the dietary nitrate pathway is oxygen-independent. This makes it particularly crucial during periods of hypoxia or high-intensity anaerobic exercise when the eNOS pathway is compromised.
Upon ingestion of amaranth extract, dietary nitrate is rapidly absorbed across the upper gastrointestinal tract into the systemic circulation, leading to a peak in plasma nitrate concentrations within 1 to 2 hours. However, mammalian cells lack the specific reductase enzymes required to convert nitrate into nitrite. Instead, the body relies on a symbiotic relationship with the oral microbiome. Approximately 25% of the circulating nitrate is actively extracted from the blood by the salivary glands and concentrated in saliva—a process known as enterosalivary circulation.
Once secreted into the oral cavity, commensal facultative anaerobic bacteria residing in the crypts of the tongue reduce the nitrate (NO3-) to nitrite (NO2-). When this nitrite-rich saliva is swallowed, it encounters the highly acidic environment of the stomach. A portion of the nitrite is immediately reduced to nitric oxide (NO) and other reactive nitrogen species, which helps regulate gastric mucosal integrity and provides antimicrobial defense. The remaining nitrite is absorbed into the systemic circulation, elevating plasma nitrite levels.
Systemic Reduction to Nitric Oxide and Vasodilation
Circulating nitrite acts as a stable endocrine reservoir of nitric oxide. Under conditions of physiological stress, localized hypoxia, or low pH—such as in working skeletal muscle during intense exercise—various proteins and enzymes (including deoxyhemoglobin, deoxymyoglobin, xanthine oxidoreductase, and even the mitochondrial electron transport chain) catalyze the reduction of nitrite to bioactive nitric oxide.
Once generated, NO diffuses into the smooth muscle cells lining the blood vessels. It binds to the heme moiety of soluble guanylyl cyclase (sGC), activating the enzyme to convert guanosine triphosphate (GTP) into cyclic guanosine monophosphate (cGMP). The accumulation of cGMP activates protein kinase G (PKG), which subsequently phosphorylates several target proteins. This cascade leads to a decrease in intracellular calcium concentrations and the desensitization of the contractile apparatus to calcium, resulting in smooth muscle relaxation and profound vasodilation. This mechanism directly explains the Grade B clinical evidence showing that dietary nitrates significantly lower resting blood pressure and improve vascular function in both healthy adults and those with hypertension.
Mitochondrial Efficiency and Exercise Performance
Beyond vasodilation, the nitric oxide derived from amaranth nitrates exerts profound effects on cellular respiration and mitochondrial efficiency. NO competitively binds to cytochrome c oxidase (Complex IV) in the mitochondrial electron transport chain. This interaction modulates mitochondrial respiration, effectively reducing the oxygen cost of ATP production.
In practical terms, this means that during aerobic exercise, the body requires less oxygen to maintain the same submaximal workload. This mechanism underpins the clinical findings that dietary nitrates improve aerobic exercise metrics, increase time-to-exhaustion, and enhance overall exercise capacity. Furthermore, NO improves calcium handling in the sarcoplasmic reticulum of skeletal muscle, which enhances muscle contractile efficiency and force production, explaining the observed increases in jump height and anaerobic performance metrics.
Lipid Metabolism and the Squalene Paradox
Amaranth grain and amaranth oil contain a unique lipid profile, most notably a high concentration of squalene—a highly unsaturated triterpene that serves as a biochemical precursor to the entire steroid family, including cholesterol. In animal models, amaranth consumption has consistently demonstrated hypocholesterolemic effects, lowering total cholesterol and low-density lipoprotein (LDL) while elevating high-density lipoprotein (HDL). The proposed mechanism involves the inhibition of 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, the rate-limiting enzyme in hepatic cholesterol synthesis, as well as an increase in the fecal excretion of bile acids.
However, human clinical trials have failed to replicate these findings. When overweight adults or individuals with hypercholesterolemia consume amaranth oil or amaranth-enriched foods, total and LDL cholesterol levels do not significantly decrease, and in some isolated cases, LDL levels marginally increased. This discrepancy is likely due to species-specific differences in squalene metabolism. In humans, dietary squalene is efficiently absorbed and rapidly converted into cholesterol in the liver, potentially offsetting any HMG-CoA reductase inhibition caused by other phytosterols or bioactive peptides present in the amaranth plant. Therefore, while amaranth possesses potent antioxidant properties, its mechanism as a lipid-lowering agent in humans is considered clinically ineffective.
Antioxidant and Hematological Mechanisms
Amaranth is rich in phenolic compounds, flavonoids, and tocopherols (Vitamin E). These molecules act as direct scavengers of reactive oxygen species (ROS) and reactive nitrogen species (RNS), protecting cellular lipid membranes from peroxidation. Additionally, early research suggests that amaranth grain, which is highly bioavailable in iron and essential amino acids, can stimulate erythropoiesis (red blood cell production). In pediatric populations with iron-deficiency anemia, the consumption of amaranth-enriched bread has been shown to increase hemoglobin and healthy red blood cell counts, likely due to the synergistic effect of its iron content and the presence of ascorbic acid, which enhances non-heme iron absorption in the gut.
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Everything About Amaranth Article
Introduction to Amaranth: From Ancient Grain to Modern Performance Enhancer
Amaranth is a broad term that refers to over 60 different species of plants in the Amaranthus genus. For thousands of years, the seeds of the amaranth plant were a staple crop for the Aztec and Incan empires, revered for their incredible nutrient density and resilience. Today, amaranth is widely recognized in the health food sector as a gluten-free 'pseudocereal'—similar to quinoa—packed with complete proteins, dietary fiber, and essential minerals like iron and magnesium.
However, in the realms of clinical sports nutrition and cardiovascular health, the focus has shifted entirely away from the grain and toward the leaves of the plant. Specific species, such as Amaranthus hypochondriacus and Amaranthus tricolor (often referred to as red spinach), are incredibly rich in dietary nitrates. When extracted and standardized, amaranth leaf has emerged as one of the most potent, scientifically backed natural vasodilators on the market, rivaling and often surpassing the popular beetroot extract.
The Nitrate Connection: How Amaranth Fuels Athletic Performance
The primary reason amaranth extract is included in premium pre-workout supplements is its dietary nitrate content. According to extensive clinical data compiled by Examine.com, dietary nitrates possess Grade B (Moderate to Strong) evidence for improving both aerobic and anaerobic exercise performance.
When you consume a high-nitrate amaranth extract, the body utilizes a unique pathway to convert these nitrates into nitric oxide (NO). Unlike other pump ingredients like L-arginine or L-citrulline, which require oxygen to produce NO, the nitrate pathway is oxygen-independent. This is a critical distinction for athletes. During intense exercise—whether it's a heavy set of squats, a 400-meter sprint, or a grueling cycling climb—your muscles become hypoxic (deprived of oxygen) and acidic. The amaranth-derived nitrate pathway actually becomes more efficient under these harsh conditions, ensuring a steady release of nitric oxide exactly when your muscles need it most.
This surge in nitric oxide relaxes the smooth muscle tissue lining your blood vessels, leading to profound vasodilation. For bodybuilders, this translates to skin-tearing muscle pumps and enhanced nutrient delivery. For endurance athletes, nitric oxide improves mitochondrial efficiency, meaning your body literally requires less oxygen to produce the same amount of energy. Meta-analyses show that this leads to small but highly reliable improvements in time-to-exhaustion, aerobic capacity, and even explosive movements like jump height.
Cardiovascular Health and Blood Pressure Management
The same vasodilatory mechanism that gives athletes an edge in the gym makes amaranth nitrates a powerful tool for cardiovascular health. By widening the blood vessels, nitric oxide reduces the resistance against which the heart must pump.
Clinical evidence strongly supports the use of dietary nitrates for blood pressure management. Across dozens of studies, nitrate supplementation has been shown to provide a statistically significant reduction in resting blood pressure in both healthy adults and those suffering from hypertension. Furthermore, nitrates improve general endothelial function, which is a key marker of long-term cardiovascular health and healthy vascular aging.
The Truth About Amaranth and Cholesterol
While the sports performance and blood pressure benefits of amaranth are well-documented, there is a significant amount of misinformation regarding its ability to lower cholesterol. Amaranth grain and amaranth oil contain a compound called squalene, which is a precursor to cholesterol synthesis.
Early animal studies generated massive excitement when rodents fed amaranth showed dramatic decreases in total cholesterol and 'bad' LDL cholesterol, alongside increases in 'good' HDL cholesterol. However, as noted by WebMD clinical reviews, these benefits do not translate to humans. In clinical trials involving overweight adults and individuals with high cholesterol, daily supplementation with amaranth oil or amaranth-enriched foods failed to lower cholesterol levels. In fact, some data suggests it may marginally increase LDL levels in humans due to differences in how our bodies metabolize squalene compared to rodents. Therefore, amaranth is currently rated as 'Possibly Ineffective' for human lipid management.
Traditional Uses: Ulcers, Diarrhea, and Anemia
In traditional folk medicine, various parts of the amaranth plant have been used to treat stomach ulcers, diarrhea, and swelling of the mouth and throat. Modern science has largely debunked these uses. Clinical research shows that amaranth oil does not improve healing in patients with stomach ulcers, and there is insufficient evidence to support its use as an anti-diarrheal agent.
However, one traditional use does hold promise: the treatment of anemia. Amaranth grain is exceptionally high in bioavailable iron. Early research indicates that incorporating amaranth grain into the daily diet (such as baking it into bread) can significantly increase healthy red blood cell counts and hemoglobin levels in children suffering from iron-deficiency anemia.
Dosing, Timing, and Safety Protocols
If you are using amaranth for sports performance or blood pressure support, you must use a standardized leaf extract, not the grain or oil. The clinical dose of dietary nitrate ranges from 200 mg to 1,488 mg per day. For exercise performance, the optimal dose is typically between 400 mg and 800 mg of actual nitrate.
Timing is critical. The conversion of nitrate to nitric oxide relies on your oral microbiome and digestion, which takes time. You must consume amaranth extract 2 to 3 hours before your workout to allow plasma nitrite levels to peak. Taking it 15 minutes before hitting the gym will not provide acute performance benefits.
Safety and Interactions: Amaranth is LIKELY SAFE when consumed in food amounts and POSSIBLY SAFE when used medicinally for up to 3 weeks. However, because of its potent blood-pressure-lowering effects, amaranth nitrates have severe drug interactions. You must avoid high-nitrate amaranth supplements if you are taking prescription blood pressure medications or PDE5 inhibitors (erectile dysfunction drugs like Viagra or Cialis), as the combination can cause a dangerous, life-threatening drop in blood pressure. Additionally, pregnant and nursing women should avoid medicinal doses of amaranth due to a lack of safety data.