You are standing in the supplement aisle or scrolling through Amazon, trying to decide between NOW L Citrulline capsules and BulkSupplements L Citrulline powder. Both brands have strong reputations, but they serve different needs. This guide breaks down the differences in form, dosage, and quality to help you choose the right L citrulline supplement for your fitness and health goals in 2026.
We compare five top products from NOW and BulkSupplements, including capsules and powders, to give you a clear picture. Whether you prioritize convenience, potency, or value, we have you covered. For more comparisons, check out our comparisons page.
Pros
- High-quality, trusted brand with GMP certification
- Vegan and allergen-free formulation suits many dietary needs
- Supports both protein metabolism and immune function
- No artificial additives or GMOs
- Convenient 90-count bottle for a 3-month supply at 1 capsule/day
Cons
- Some users may experience mild digestive discomfort if taken on an empty stomach
- Heat sensitivity during shipping may affect product consistency, though Amazon follows manufacturer guidelines
- No significant clinical evidence for athletic performance enhancement, as it's primarily for general wellness
NOW Foods L-Citrulline 750 mg is a popular amino acid supplement designed to support protein metabolism and immune health. It's an excellent choice for athletes, fitness enthusiasts, or anyone looking to optimize their body's natural processes. This vegan-friendly capsule is free from common allergens, making it accessible to a wide range of users.
The standout feature is its role in the urea cycle, where it helps detoxify ammonia, a byproduct of protein metabolism. This can be particularly beneficial for those on high-protein diets. Additionally, its support for a healthy immune system adds versatility, making it a great daily wellness supplement.
In terms of quality, NOW Foods is a well-respected brand with a long history of producing reliable supplements. The GMP certification ensures that every batch is tested for potency and purity, giving users peace of mind. The capsules are easy to swallow and have no unpleasant taste, which is a plus for daily use.
While the product is generally well-tolerated, some users might experience mild stomach upset if taken on an empty stomach, so it's best to take it with food. Also, be aware that during summer months, the product may arrive warm, but this is normal and doesn't affect efficacy.
Overall, NOW L-Citrulline is a solid, affordable supplement that delivers on its promises. With a high rating and positive user feedback, it's a recommended addition to your supplement stack for improved protein utilization and immune support.
Pros
- High dose per serving (3g) effective for nitric oxide support.
- Unflavored allows easy mixing with any drink.
- Gluten free and free from common allergens.
- Third-party tested and cGMP certified for quality.
- Large 500g container offers good value.
Cons
- Unflavored may have a slightly bitter taste for some users.
- Powder form requires mixing; not as convenient as capsules.
- No scoop included for accurate dosing.
BulkSupplements L-Citrulline Powder is a pure amino acid supplement designed to boost nitric oxide levels. It is ideal for athletes, bodybuilders, and anyone looking to improve blood flow and exercise performance. This unflavored powder fits seamlessly into any fitness regimen.
Each serving delivers 3 grams of L-citrulline, a clinically effective dose for supporting vasodilation. Users may experience improved endurance, reduced muscle soreness, and better pumps during workouts. The unflavored formula mixes easily without altering the taste of your drink.
The powder has a fine, off-white texture that dissolves quickly in water or juice. It is packaged in a sturdy, resealable bag to maintain freshness. BulkSupplements adheres to strict cGMP standards and third-party testing for purity.
The unflavored nature may not mask the natural bitter taste of citrulline for some users. Additionally, the bag does not include a scoop, so you need to measure your own 3g serving. This bulk size may be too large for casual users.
Overall, BulkSupplements L-Citrulline Powder offers excellent value for those serious about athletic performance. Its high dose, purity, and versatility make it a top choice. We recommend it for fitness enthusiasts seeking a reliable nitric oxide booster.
Pros
- High potency (1,200 mg) ensures effective dosing without needing multiple pills.
- Supports nitric oxide production, which can enhance athletic performance and recovery.
- Trusted brand with GMP certification and a long history of manufacturing quality supplements.
- Non-GMO, kosher, and suitable for vegans (as per typical NOW Sports formulas, though not specified here, it's a common feature).
- Good value for the dosage and count, offering a 120-day supply at one tablet per day.
Cons
- Larger tablet size may be difficult for some people to swallow, especially those who prefer capsules.
- No added ingredients for taste or mixability; this is a plain supplement, so it may not be suitable for those expecting a flavored powder.
- Limited customer reviews available, so real-world feedback is sparse, though the brand's reputation is strong.
NOW Sports L-Citrulline 1200 mg Extra Strength is a high-quality amino acid supplement designed for individuals looking to boost their nitric oxide levels, enhance exercise performance, and support overall wellness. This product is ideal for athletes, bodybuilders, and active adults who want to improve blood flow, reduce fatigue, and aid in recovery. With a potent 1,200 mg dose per tablet, it provides a convenient way to meet your citrulline needs.
The standout feature of this supplement is its ability to promote nitric oxide production, which helps dilate blood vessels and improve circulation. This can lead to better muscle pumps during workouts, increased endurance, and reduced muscle soreness post-exercise. Additionally, citrulline plays a role in the urea cycle, helping to remove ammonia from the body, which can reduce the feeling of fatigue during intense training sessions. It also supports a healthy immune system and the healing process, making it a versatile addition to any supplement regimen.
In terms of design and build quality, the tablets are compact and coated for easy swallowing, though some users may find them slightly large. The product is manufactured in a GMP-certified facility, ensuring high standards of quality control and purity. It comes in a sturdy, recyclable bottle that protects the tablets from moisture and damage, and the label clearly lists all ingredients and dosage instructions.
Potential drawbacks include the absence of added flavors or mixability, as this is a plain tablet that must be swallowed whole. Some users might prefer a powder form for easier consumption or mixing into shakes. Additionally, while the brand is reputable, there are currently few customer reviews for this specific product, so real-world feedback is limited. However, based on the ingredient profile and brand history, it is a reliable choice.
Overall, NOW Sports L-Citrulline 1200 mg Extra Strength delivers on its promises with a potent dose, solid ingredient profile, and trusted manufacturing. It is an excellent option for anyone seeking to improve athletic performance, support immune function, and enhance overall health. With its competitive pricing and 120-tablet supply, it offers great value for the money. I highly recommend it to fitness enthusiasts and health-conscious individuals alike.
Pros
- High-quality, non-GMO ingredients with no animal products, suitable for vegans and those with allergies.
- Supports key bodily functions including protein metabolism and immune health.
- Trusted brand with GMP certification and third-party testing for quality assurance.
- Large 180-capsule bottle offers great value for daily use.
- Kosher and free from common allergens like dairy, eggs, nuts, and soy.
Cons
- Some users may prefer a higher dosage per capsule (750 mg) for targeted athletic performance, though it's ideal for general wellness.
- No added flavor or mixability, so it may not be ideal for those looking to mix it into beverages.
- Individual results may vary, and some users might not notice immediate effects.
NOW Supplements L-Citrulline 750 mg is a well-crafted amino acid supplement designed to support protein metabolism and overall immune function. This product is particularly beneficial for individuals who follow a vegan or vegetarian diet, as it provides a plant-based source of this non-essential amino acid. Whether you're an athlete looking to support your training regimen or someone seeking to maintain a healthy immune system, this supplement offers a convenient and reliable option.
The standout feature of this product is its role in the urea cycle, where it helps remove ammonia from the body, a byproduct of protein metabolism. This not only supports efficient protein use but also contributes to a healthy immune response. The capsules are easy to swallow and the 180-count bottle provides a generous supply, making it a cost-effective choice for daily supplementation.
In terms of quality, NOW is a trusted brand with a long history of manufacturing natural products. This supplement is GMP Quality Assured and third-party tested, ensuring that each batch meets high standards for potency and purity. Additionally, it is certified vegan, kosher, and free from common allergens like gluten, soy, and nuts, making it a safe choice for those with dietary restrictions.
While the 750 mg dosage is effective for general wellness, some users may prefer a higher dose for more intense athletic performance or bodybuilding purposes. Additionally, the capsules are unflavored, so if you prefer a flavored drink mix, this may not be the best fit. However, for most people, this product delivers on its promises without unnecessary additives.
Overall, NOW L-Citrulline is a solid investment for anyone looking to enhance their protein metabolism and support their immune system. Its high-quality ingredients, allergen-free formulation, and reputable brand make it a top choice in the amino acid supplement market. We highly recommend it for vegans, fitness enthusiasts, and health-conscious individuals alike.
Pros
- High 3g dose per serving for effective nitric oxide support
- Unflavored powder adds versatility to shakes, smoothies, or water
- Generous 1kg quantity provides a long-lasting supply
- Produced in a cGMP-compliant facility and batch tested for purity
- Gluten free and free from common additives and allergens
Cons
- Unflavored taste may be slightly bitter or chalky when mixed only with water
- No scoop included, so a separate measuring tool is needed for accurate dosing
- As a single-ingredient product, it lacks added electrolytes, caffeine, or other pre-workout ingredients
BulkSupplements L-Citrulline Powder is a pure, unflavored amino acid supplement designed for fitness enthusiasts and athletes seeking to enhance endurance, strength, and recovery. Each serving delivers a solid 3g dose of L-citrulline, a precursor to nitric oxide that helps improve blood flow and oxygen delivery during intense training.
This powder stands out for its simplicity and versatility. With no added sugars, fats, or fillers, it fits cleanly into keto, paleo, and gluten-free lifestyles. The unflavored formula dissolves easily in water, juice, or smoothies, making it a flexible addition to any pre-workout or daily supplement routine.
The 1kg container offers a generous supply, making it a cost-effective option for regular users. Produced in a cGMP-compliant facility and batch tested, each purchase delivers consistent quality. The lack of artificial colors and flavors reflects the brand's commitment to clean, transparent nutrition.
Potential drawbacks include the unflavored taste, which may be slightly bitter for some, and the absence of a measuring scoop in the package. Users will need to use a kitchen scale or teaspoon to dose accurately. Additionally, as a single-ingredient product, it does not provide the energy boost of a complete pre-workout formula.
Overall, BulkSupplements L-Citrulline Powder is an excellent choice for anyone looking for a pure, high-dose supplement to support performance and recovery. Its large size and clean profile make it particularly suitable for dedicated athletes and health-conscious consumers.
Brand: BulkSupplements
Product Form: Powder
Container Size: 1kg (2.2 lbs)
Serving Size: 3g
Flavor: Unflavored
Dietary Features: Gluten Free, No Added Sugars, No Fats, No Fillers
Manufacturing: Produced in a cGMP-Compliant Facility
Color: May Vary
Buying Guide
Form: Capsules vs Powder
The most obvious difference between NOW and BulkSupplements L citrulline is the form. NOW offers veg capsules in 750 mg and 1,200 mg strengths, which are convenient for travel and precise dosing. BulkSupplements provides unflavored powder, which allows you to adjust your serving size flexibly, from 3 grams up to higher doses if needed.
If you dislike swallowing pills or want to mix your supplement into a pre-workout shake, the powder is easier to incorporate. Capsules are ideal if you want a no-mess option for office or gym bags. For a broader look at amino acid supplements, see our best amino acid supplement guide.
Potency and Dosage
NOW provides two strengths: a standard 750 mg per capsule and an extra strength 1,200 mg per tablet. BulkSupplements delivers 3 grams (3,000 mg) per serving of powder, which is a common dose for athletic performance and nitric oxide support. Your choice depends on your goals. For general wellness, 750 mg to 1,200 mg may suffice. For intense workouts, 3 grams or more is often recommended.
BulkSupplements powder also makes it easy to stack with other supplements like beet root or arginine. NOW capsules are pre-measured, so you avoid the need for a scoop. Both brands are verified for purity and potency through third-party certification.
Quality and Certifications
NOW supplements are manufactured in a family-owned facility since 1968 and carry NPA A-rated GMP certification. Their products are Non-GMO, vegan, and free from common allergens like gluten, soy, and dairy. BulkSupplements also adheres to cGMP standards and undergoes third-party verification for purity and potency.
Both brands are transparent about their sourcing and manufacturing processes. If you have strict dietary requirements, NOW’s certifications may offer extra peace of mind. For more on amino acid quality, visit our amino acids category.
Final Thoughts
Choosing between NOW L Citrulline and BulkSupplements L Citrulline comes down to your lifestyle and dosing preferences. If you want a convenient, capsule-based option with verified vegan and allergen-free certifications, the NOW Supplements, L-Citrulline 750 mg, Amino Acid is a reliable choice for daily use. If you prefer a flexible, high-dose powder that can be mixed into drinks or stacked with other supplements, the BulkSupplements.com L-Citrulline Powder offers excellent value and potency for serious athletes.
Frequently Asked Questions
What is the difference between NOW and BulkSupplements L citrulline?
NOW offers L citrulline in capsule form with strengths of 750 mg and 1,200 mg, while BulkSupplements provides a powder form with 3 grams per serving. Capsules are convenient for precise dosing, while powder allows flexibility and higher doses. Both brands are high quality and third-party verified for purity.
Which L citrulline is better for pre-workout: NOW or BulkSupplements?
BulkSupplements powder is often preferred for pre-workout because you can easily mix 3 grams or more into a shake, which is a common dose for nitric oxide and performance. NOW capsules work well if you want a portable option, but you may need to take multiple capsules to reach the same dose.
Can I take L citrulline every day?
Yes, L citrulline is safe for daily use within recommended doses. For general health, 750 mg to 1,200 mg per day is common. For athletic performance, 3 to 6 grams per day is often used. Always follow the label instructions and consult a healthcare professional if you have underlying conditions.
Are NOW and BulkSupplements L citrulline vegan?
Yes, both brands offer vegan options. NOW L citrulline capsules are made with veg capsules and are certified vegan. BulkSupplements L citrulline powder is unflavored and contains no animal-derived ingredients, making it suitable for vegans and vegetarians.
For more comparisons, see our nutricost vs BulkSupplements L-Citrulline article.
