L-Citrulline, Pure Powder, 4 oz (113 g), Now Foods

NOW Foods L-Citrulline Pure Powder delivers a clean, single-ingredient amino acid that the body converts to L-arginine — making it a highly effective and sustained nitric oxide booster for circulation, exercise performance, and cardiovascular support.

Why

L-citrulline has a significant advantage over L-arginine supplementation: when you take L-arginine directly, much of it is broken down in the gut and liver before reaching the bloodstream. L-citrulline bypasses this first-pass metabolism, is absorbed intact, and is then converted to L-arginine in the kidneys — resulting in a more sustained and meaningful rise in plasma arginine and nitric oxide levels. This makes it the preferred choice for athletes and those seeking genuine circulatory and cardiovascular support. L-citrulline also plays a direct role in the urea cycle, helping the body clear ammonia — a fatigue-inducing byproduct of protein metabolism and intense exercise. NOW Foods' pure powder format means no fillers, no capsule excipients, and full flexibility over dosing. Vegan, GMP certified, and rigorously quality tested.

Key Benefits

• Raises plasma L-arginine and nitric oxide levels more effectively than L-arginine supplementation alone
• Supports vasodilation and healthy blood flow to muscles and cardiovascular system
• Supports exercise endurance, performance, and muscle recovery
• Assists the urea cycle — helps clear ammonia generated during protein metabolism and exercise
• Supports healthy immune system function
• Pure powder — no fillers, binders, or additives
• Vegan and vegetarian friendly, GMP quality assured

Formula Highlights

• L-Citrulline (Pure, Free-Form) – non-essential amino acid naturally found in watermelon; absorbed intact in the gut and converted to L-arginine in the kidneys for sustained nitric oxide production
• Nitric Oxide Pathway – citrulline → arginine → nitric oxide via nitric oxide synthase (NOS); NO relaxes vascular smooth muscle, widening blood vessels and improving circulation
• Urea Cycle Role – citrulline is a direct intermediate in the hepatic urea cycle, supporting conversion of toxic ammonia to urea for safe excretion — particularly relevant during high-protein diets and intense training
• Superior Bioavailability vs L-Arginine – citrulline avoids first-pass gut and liver metabolism that limits oral arginine absorption, delivering a more sustained and effective rise in plasma arginine levels
• Pure Powder Format – no capsule excipients, no fillers; full flexibility to adjust dose precisely

Supplement Facts

Serving Size: 1/4 to 1/2 level teaspoon (~750 mg–1,500 mg) | Servings Per Container: varies

* Daily Value not established. Exact amount per serving depends on scoop size used.

Suggested Use

Take 1/4 to 1/2 level teaspoon 1 to 2 times daily between meals, or as directed by a healthcare professional. Mix into water, juice, or a smoothie. Athletes may use higher doses — consult your healthcare practitioner for personalised guidance.

Other Ingredients

Pure L-citrulline powder. No other ingredients added. Vegan and vegetarian friendly. GMP quality assured.

About NOW Foods

Founded in 1968 and still family-owned, NOW Foods is one of the most trusted names in nutritional supplements worldwide. With over 1,400 products manufactured to GMP (Good Manufacturing Practice) standards, NOW is committed to making high-quality natural products accessible and affordable. Their use of pure, single-ingredient formulas reflects a genuine commitment to transparency and potency that has made them a go-to brand for health professionals and informed consumers for more than 50 years.

Warnings

For adults only. Consult your healthcare practitioner before use if pregnant, breastfeeding, taking medication (particularly blood pressure or cardiovascular medications), or managing any medical condition. Keep out of reach of children. Store in a cool, dry place with lid tightly closed.