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L-Arginine HCL Powder

500g Powder | Muscle Performance Supplement
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Free Delivery on all UK orders over £35.

Want to get the best out of your workouts? L-Arginine HCL Powder could be the boost that you are looking for. This 100% protein formula is great for helping tone, strengthen and build muscle mass. It also boosts your natural supply of Nitric Oxide, for enhanced blood flow to the muscles which help improve exercise performance. Our powder is vegan-friendly, flavour and additive-free, and gives you 100 servings per pack.

  • For muscle size, strength & tone
  • Boosts blood flow
  • 100% protein formula
  • 100 servings per tub
  • No additives, flavourless & chemical-free
  • Vegan
  • Gluten-free
  • Vegetarian
  • Dairy-free
  • Lactose Free

What Are Branched Chain Amino Acids?

There are 20 different Amino Acids which culminate to form protein, all of which are unique, but all of which have a profound effect on protein synthesis in the body. On a cellular level, Amino Acids are the building blocks with which your body forms protein structures, in particular microfibres (the individual fibres which form skeletal muscle). Therefore Amino Acids are an essential ingredient for building and repairing your muscle.

Why Supplement With L -Arginine?

Muscle Size And Strength

L-Arginine is one of the most widely used and revered muscle gainers on the market, and one of the most famous of the 20 Amino Acids, which are the building blocks of muscle protein. Arginine is widely used by athletes and bodybuilders as an active agent to help with the process of muscle size and definition growth. This supplement provides this active agent in a concentrated powdered form, for fast absorption that can be achieved from simply mixing into a drink or food.


When ingested, Arginine releases Nitric Oxide, a natural chemical agent which is linked to the dilation of the blood vessels. Relaxed blood vessels can help to relieve tension, improve overall circulation, and also dramatically lower the risk or cholesterol buildup, scarring or damage to the arterial walls.

How To Take L-Arginine Powder

Consume 1 scoop (4 grams) of L-Arginine Powder mixed into water thoroughly, or mixed into food within 1 hour before or after exercise. You should not exceed the recommended daily serving unless you have received the consultation and permission of a healthcare professional. Please ensure that the scoop has been leveled off to ensure that you are not consuming too much of the product.

Full Ingredients List

L-Arginine Powder

Advice When Taking L-Arginine Powder

Please do not consume this supplement as a meal replacement supplement as this product is intended simply to complement a balanced diet and exercise. This supplement is suitable for both vegans and vegetarians and there are no known side-effects of consuming L-Arginine.

Customer Reviews

At WeightWorld we strive to offer the best possible customer service and we take great pride in the feedback we have received from our customers. All testimonials and reviews below are the experiences and opinions of WeightWorld customers. They should not be considered as health, medical or medicinal claims. They are no substitute for taking medical advice.

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Outstanding Trustpilot rating5

98.46% based on 13 Reviews

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  • I like that this has no specific flavour as it means it is alot easier to add to different types of shakes as otherwise I get bored having the same thing everyday.


  • Really good size tub and great for the gym. It is good that it has no flavours and preservatives.


  • easy enough to use. I workout 5 times a week so wanted something to take and have been trying a few different ones but keep going back to this.


  • This is a good size tub - it fits in my gym bag and has a good amount in it. I also like how it is flavourless so I can add it to different drinks depending on what I feel like.


  • easy to use and I like the size


  • I like this. It is working for me and I got my friend to get some too.


  • This is now my favourite


  • I find this really great after a workout so would recommend highly


  • I bought a whole bundle of these products (BCAA Glutamine, Beta Alanine etc) If you take them all you'll feel them each working to complement your workout - Arginine helps you not fatigue, Alanine is good for breaking your threshholds, BCAAS are great for recovery


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* Results may vary from one person to another.