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NOW Foods L-Arginine 1000 mg, 120 Tablets bottle
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NOW Foods L-Arginine 1000 mg, 120 Tablets Review

L-Arginine is a conditionally essential basic amino acid primarily involved in urea metabolism and excretion, as well as in DNA synthesis and protein production. It is an important precursor of nitric oxide (NO) and thus plays a role in the dilation of blood vessels.

Product Focus: Sexual Health for MenAlso covers:HeartHormones
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Evidence ⓘ
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How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
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Cost per month
$9
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Study, Trial or Testing Result Summary

MembersHuman studies

This product gives 2 grams of L-arginine a day, which is the lowest amount that in studies (1,500 milligrams), so it counts as a dose. A review of ten trials in 540 men with mild to moderate erection found that 1,500 to 5,000 milligrams a day than a placebo. …

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Review Totals and Summary

Members175 reviews
175 reviews · Nowfoods 102 · Target 50 · Swanson 16 · Food4less 4 · Nahdionline 3

Users of NOW Foods L-Arginine 1000 mg, 120 Tablets generally report very favorable experiences, with reviews leaning and highlighting noticeable after regular use. Across multiple platforms, a recurring theme in feedback is that users feel the supplement supports their overall energy levels and, for some, contributes to workout performance or recovery. …

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Biohacker Summary

MembersWhat our biohacker panel says

Arginine is the only ingredient here, and the panel leans toward it, though of them are sold on it. of the panel take or suggest it to nitric oxide and blood flow, mainly before workouts or endurance sessions, and some also name growth hormone, sexual performance, calmness when paired with GABA-rich foods, or use around a meal after a fast. …

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RAL Summary

MembersThe tier and why

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More Details

MembersBody systems · Combine with · Possible side effects

Body systems: Reproductive system, Cardiovascular system, Endocrine system. Combine with and possible side are for members.

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Supplement Facts

L-Arginine 1 g
Supplement Facts
Serving Size 1 Tablet
Servings Per Container 120 Tablets
Amount Per Serving% Daily Value
L-Arginine (from L-Arginine HCl)1 g†
† Daily Value not established.

Other ingredients: Microcrystalline Cellulose, Hydroxypropyl Cellulose, Stearic Acid (vegetable source), Croscarmellose Sodium, Silicon Dioxide and Vegetarian Coating [hypromellose (cellulose), calcium carbonate, glycerin].

Directions: SUGGESTED USAGE: Take 1 tablet twice daily as needed. Take between meals or at bedtime with at least 8 oz. of water or juice to facilitate absorption.

Barcode (UPC) 733739000255 · Label source: Nowfoods · Report a label change

Where to Buy

NOW Foods · Walgreens · Target
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Our articles on this subject

Graded October 24, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.