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NOW Sports L-Citrulline

·870 words·5 mins
Cardiovascular Health Energy and Endurance Muscle Growth and Recovery Digestive Health 0-2 weeks 4-8 weeks
Rolf Streefkerk MSc
Rolf Streefkerk MSc
IT Entrepreneur and hobbyist fitness and health enthusiast
Table of Contents

NOW Sports L-Citrulline is a supplement from Now Foods designed to support exercise performance and cardiovascular health benefits.

This supplement review will summarize the potential benefits, Time frame efficacy, and third-party testing data for this specific supplement. For a more in-depth discussion, please refer to our comprehensive article here.

Cardiovascular Health #

Benefits #

May help to lower blood pressure, increase blood flow and support general cardiovascular health.

Time frame #

  • Immediate to Medium-term effects: Some evidence suggests within a week there can be benefits associated with cardiovascular health.
  • Long term effects: There needs to be more evidence to see how long term use of L-Citrulline benefits cardiovascular health.

Suggested Use and Dosage #

3-6 grams per day seems to provide the most benefit for most people, this would require some experimentation what dosage would work best for you.

Energy and Endurance #

Benefits #

This supplement can improve endurance performance, including increased time to exhaustion, decreased fatigue, and improved aerobic energy production.

Time frame #

  • Immediate effects: After 1-2 hours you can already experience improved energy and endurance.
  • Medium-term effects: It may further enhance energy and endurance.
  • Long-term effects: Limited evidence is available on the long-term effects of L-citrulline supplementation on endurance.

Suggested Use and Dosage #

Evidence suggests 6-8 grams of L-citrulline per day, taken 1-2 hours before exercise.

Safety and Precautions #

L-citrulline is generally well-tolerated when taken at recommended dosages for endurance. Mild side effects, such as gastrointestinal discomfort, may occur in some individuals

Personal Experience #

I’ve been using 3.6 grams of L-Citrulline supplementation with a diet of regular beef, egg, and dairy consumption, which provides well over 6 grams of L-arginine per day. With this diet and supplementation, I’m experiencing some cardiovascular improvements during weight training sessions of about 1 hour each, 4 times a week. I would not say the differences are very noticable before using L-citrulline versus after.

In time, I might consider using this for just the cardiovascular benefits it provides. Since I have a naturally high blood pressure and this may alleviate that somewhat.

Muscle Growth #

Benefits #

This supplement could improve resistance exercise performance such as; increased reps and decreased muscle soreness. However, all the studies done include Malate, as L-Citrulline Malate.

There’s no research available for L-Citrulline alone when it comes to strength benefits specifically.

Time frame #

  • Immediate effects: within 1-2 hours after ingestion.
  • Medium to Long-term effects: Limited evidence is available on the medium-term effects of L-citrulline supplementation on strength and recovery.

Suggested Use and Dosage #

The dosages for L-citrulline have not been formally tested for Muscle Growth benefits.

However, there have been studies conducted for Citrulline Malate (CM), but the ratios used for these studies is unknown. Usually CM is mixed either 1:1 or 2:1, the dosage for L-citrulline alone could be in the range of; 4 to 6 grams per day, 1 hour before exercise.

Some experimentation is required to get the best effect for your particular situation.

Safety and Precautions #

L-citrulline is generally well-tolerated when taken at recommended dosages for endurance. Mild side effects, such as gastrointestinal discomfort, may occur in some individuals

Reader Reviews #

Based on reviews from iHerb and Amazon, we’ve found the following key points for NOW Sports L-Citrulline:

  1. Positive Reviews

    • Many reviewers report improved blood flow, increased energy, and better workout performance after taking L-Citrulline.
    • Some users experienced reduced blood pressure and improved heart health.
    • L-Citrulline seems to be helpful for people with poor digestion or IBS.
    • Some users mentioned that L-Citrulline may have positive effects on the immune system and men's health.
    • Several reviewers found the quality, packaging, and size of the tablets to be satisfactory.
    • Common usage patterns include taking 2-3 tablets daily or before workouts

  2. Neutral Reviews

    Some users felt that it was too early to tell if L-Citrulline was effective or not.

  3. Negative Reviews

    • Some users did not notice any significant difference in their workout performance or energy levels after taking L-Citrulline.
    • A few reviewers found the tablets to be too large or difficult to swallow.

Third-Party Testing Data #

Any batch of this product sold now has not been third party tested that can be accessed online, as far as we know. #

The following has been stated on

NOW Sports L-Citrulline Tabs This product was voluntarily withdrawn from the Informed Sport programme on the date listed below. Any batches produced since this date will not be tested. Previously tested batches will remain on the website until they expire.

Date Withdrawn: 30-Aug-2020 #

On Labdoor there are 12 products from Now (Sports) Foods that all have A Grade and up, testing results, which could indicate high quality standards for this supplement.

Where to Buy NOW Sports L-Citrulline #

NOW Foods, Sports, L-Citrulline, 1,200 mg, 120 Tablets

NOW Foods, Sports, L-Citrulline, 1,200 mg, 120 Tablets on

Read more #

For detailed information on the benefits, Time frame, and supporting evidence, please refer to our comprehensive article;

L-Citrulline (Malate) and L-Arginine
·2257 words·11 mins
L-citrulline and L-arginine are two amino acids that play an important role in nitric oxide production, cardiovascular health, and exercise performance.

Comments #

Please let us know what your experience has been with this supplement down in the comments below.