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Which bodily systems depend on L-arginine?
Don Farrall/Photodisc/Getty ImagesThat man looks incredibly fit with his chiseled abs, massive chest, and arms as large as melons — seemingly without a trace of body fat. He confidently gestures to the camera, attributing his physique to daily doses of L-arginine, a powerful amino acid. It’s hailed as a natural wonder, offering benefits akin to human growth hormone.
Is he trustworthy?
He’s correct on one point: L-arginine, also known simply as arginine, is indeed an amino acid. Can it enhance your health? Yes, in certain situations. Will it transform you into a muscular giant? No, and consuming the amount he suggests could potentially harm your health.
L-arginine aids the body in eliminating waste and producing proteins. Conditions like severe burns, sepsis, jaundice, protein deficiencies, and malnutrition can impair your body’s ability to produce L-arginine [source: Drugs.com]. Dialysis can also have this effect. Individuals with insufficient L-arginine may experience symptoms such as constipation, hair loss (alopecia), and skin issues. Their wounds might heal slowly, and fat could accumulate in their livers [source: Mayo Clinic].
This article delves deeper into L-arginine: its functions, limitations, known facts, unknowns, potential benefits, risks, and its role in human growth.
L-Arginine at Work in Your Body
L-arginine is classified as a semi-essential amino acid. This might seem contradictory — something is either essential (like shelter) or non-essential (like cable TV), right?
In a way, yes. The term "essential" carries a unique definition in nutrition. It refers to nutrients that your body cannot produce independently, so you must acquire them through diet or supplements [source: Baggott]. L-arginine is termed semi-essential because, under normal circumstances, the body generates sufficient amounts on its own [source: MedlinePlus]. However, during situations like trauma or liver disease, deficiencies can arise, necessitating L-arginine supplementation [source: Drugs.com].
L-arginine is crucial for your body to produce urea, the waste eliminated through urination [source: Mayo Clinic]. Urea forms as a byproduct of protein breakdown. While your body requires some nitrogen, protein metabolism generates excess amounts. Urea production efficiently removes this surplus nitrogen [source: WebMD]. L-arginine plays a key role in managing waste and maintaining chemical equilibrium.
L-arginine aids in the production of creatine, a protein that enhances muscle mass and strength. It also assists in eliminating creatinine, the waste product from this process [source: Mayo Clinic]. These benefits make creatine and L-arginine supplements popular in the bodybuilding community.
The effects of L-arginine vary depending on how it is introduced to the body. It can be consumed as a supplement, inhaled, or injected [source: Mayo Clinic]. Naturally, it is also obtained through dietary sources.
When used medicinally, L-arginine acts as a vasodilator, widening blood vessels to increase blood flow. This can lower blood pressure and, in some cases, help manage arterial blockages associated with conditions like atherosclerosis [source: Mayo Clinic].
Discover the potential health advantages of L-arginine by continuing to read.
If you prefer not to use supplements or medications, how can you still benefit from L-arginine? It is naturally present in various nuts, legumes, and seeds. Walnuts, peanuts, hazelnuts, pecans, Brazil nuts, cashews, and almonds are all rich in it. Sunflower and sesame seeds also contain it. Whole grains like oats, barley, brown rice, and buckwheat, as well as raisins, coconuts, and many meat and dairy products, are excellent sources [source: Mayo Clinic]. If you consume these foods regularly, you’re likely getting enough L-arginine. If not, a simple snack like trail mix can help.
L-Arginine Benefits
What are the potential benefits of L-arginine? Let’s explore them.
First, it can address issues related to urea production and waste elimination. Certain chemical imbalances lead to the buildup of waste in the body. Depending on the specific chemicals involved, L-arginine can help restore balance [source: MedlinePlus].
L-arginine might alleviate symptoms of angina (chest pain) and coronary disease. Both the National Institutes of Health and the Mayo Clinic emphasize the need for further research, but L-arginine shows promise as a treatment for certain heart conditions. It may also enhance blood circulation. For some individuals, L-arginine can help lower blood pressure. Those suffering from blood clots, particularly in the legs, might experience relief with L-arginine supplementation [source: MedlinePlus].
For those with open wounds, L-arginine could be a beneficial option. Individuals with severe burns, malnutrition, or specific wasting diseases often experience slower healing, increasing the risk of infections and complications. L-arginine has shown potential as a treatment in such scenarios [sources: Medline, Drugs.com].
Some also believe L-arginine plays a role in growth regulation. Irregular or excessive growth might indicate an L-arginine deficiency [source: MedlinePlus]. Additionally, it may help reduce migraine pain. While more research is needed, L-arginine could be effective when combined with pain relievers like ibuprofen [source: MedlinePlus].
As mentioned earlier in the bodybuilder example, many claim L-arginine can increase muscle mass. However, it’s not the miraculous muscle enhancer some marketers suggest. No chemical could realistically meet such exaggerated claims. That said, L-arginine might help maintain muscle mass—though this remains uncertain.
Finally, L-arginine may enhance sexual function [source: Drugs.com]. Evidence suggests it can improve the performance of organs that depend on blood vessel dilation, including sexual organs. Some believe it boosts endurance, though this remains unproven. However, L-arginine isn’t a cure for erectile dysfunction unrelated to blood flow and may not match the effectiveness of prescription medications or therapy.
So, those are the potential benefits. But can L-arginine cause harm? Absolutely. Keep reading to learn how.
Some bodybuilding retailers assert that L-arginine supplements can increase muscle mass, accelerate fat burning, regulate salt levels, enhance sexual performance, strengthen the immune system, balance cholesterol, and perform nearly every other function imaginable—short of solving global conflicts [source: Bodybuilding.com]. As with all such claims, stay informed. Be wary of marketing hype and exercise caution with products not regulated by the U.S. FDA. MedlinePlus, a service of the National Institutes of Health, states that most individuals don’t require L-arginine supplements since their bodies produce sufficient amounts naturally.
L-Arginine Side Effects
Like any drug or supplement, L-arginine can cause side effects.
L-arginine influences how your body processes waste, which can negatively impact organs involved in waste elimination. It may worsen certain liver and kidney conditions. Additionally, L-arginine use can disrupt potassium balance, cause dehydration, and lead to stomach cramps, nausea, and other digestive issues [source: MedlinePlus].
L-arginine can also cause circulatory side effects. Individuals recovering from heart attacks should avoid it [source: Drugs.com]. Since it dilates blood vessels, it may increase the risk of excessive bleeding. Those with hemophilia or on blood thinners, as well as people taking gingko biloba—another supplement that raises bleeding risk—should avoid it [source: MedlinePlus]. It can worsen low blood pressure and exacerbate symptoms in people with sickle cell disease [source: Mayo Clinic].
While L-arginine production can be affected by dialysis, it might seem logical to recommend it to diabetics. However, evidence suggests it can raise blood sugar levels [source: Mayo Clinic]. This highlights the complexity of how chemicals interact within the body.
One of the most serious potential side effects of L-arginine is anaphylaxis [source: Mayo Clinic]. This severe allergic reaction can lead to shock or even death. Symptoms include sudden chills, sweating, tremors, hives, vomiting, diarrhea, shortness of breath, and fainting—all occurring simultaneously. If you have allergies, get tested for an L-arginine allergy before using it.
A final warning: Be cautious with herbal supplements claiming to contain L-arginine. Unlike prescription drugs, herbal supplements aren’t regulated by the FDA. This means dosages can vary even within the same bottle, making their effects unpredictable.
On the next page, we’ll explore how L-arginine might contribute to human growth.
No one should use L-arginine without consulting a doctor. However, individuals with asthma or chronic pulmonary disease should likely avoid it entirely. Evidence suggests L-arginine can worsen asthma symptoms. By dilating blood vessels, it may increase inflammation in the lungs [source: Mayo Clinic].
L-Arginine and Human Growth
If L-arginine promotes protein synthesis, particularly creatine, wouldn’t it naturally support human growth? The answer isn’t straightforward. The full effects of L-arginine on the body remain unclear and not fully understood.
The U.S. Food and Drug Administration has approved arginine for testing certain growth disorders. During these tests, arginine is injected to help doctors measure growth hormone levels [source: Mayo Clinic].
L-arginine might enhance the activity of certain hormones, such as human growth hormone. However, this is uncertain. Its interactions with hormones are complex and varied. For instance, estrogen may increase its effects, while progesterone may reduce them [source: MedlinePlus].
L-arginine might play a role in supporting human growth before birth. While more research is needed, it’s possible that pregnant women could one day take L-arginine supplements to promote fetal development, particularly in cases of preeclampsia—a serious condition involving high blood pressure during pregnancy [source: Mayo Clinic]. Low birth weight is a significant risk factor for infant mortality and various health complications.
An intriguing application of L-arginine is its potential to prevent muscle wasting rather than promoting growth. For individuals with chronic wasting diseases like HIV/AIDS, L-arginine may help preserve muscle mass [source: Mayo Clinic]. Severe weight loss can lead to other health risks, and muscle deterioration can reduce independence. Thus, L-arginine could improve the quality of life for such patients.
Despite being marketed as a bodybuilder’s ideal supplement, L-arginine receives a "D" rating from the Mayo Clinic for enhancing exercise performance [source: Mayo Clinic]. So, don’t cancel your gym membership just yet. Achieving toned muscles and a sculpted physique still requires hard work, with no shortcuts in sight.
If you’re just discovering the benefits of L-arginine, you might be eager to start taking supplements immediately. However, proceed with caution. Some individuals have hyperargininemia, a condition where the body produces excess L-arginine [source: Mayo Clinic]. Additionally, due to potential side effects—especially for those with heart disease or at high risk—you should only incorporate L-arginine into your routine after consulting your doctor.
