Nitric Oxide PRO 750mg Capsules | L-Arginine HCl UK

750mg L-Arginine HCl · Vegan HPMC Capsule · Made In-House · UK Since 2016

Nitric Oxide PRO 750mg Capsules — L-Arginine HCl

750mg of L-arginine hydrochloride in every capsule, filled in our own Southend-on-Sea unit.
Two ingredients on the label: L-arginine HCl and the plant-based capsule shell.

On this page

Quick answer · How to take it · What's in each capsule · HCl vs arginine · Full specification · Safety · Pack sizes and cost · eBay sales · Buyer feedback · FAQ

Quick answer: what is Nitric Oxide PRO?

What it is: A food supplement capsule containing 750mg L-arginine hydrochloride (L-arginine HCl), the stable salt form of the amino acid L-arginine. Each capsule provides about 620mg of L-arginine.

Serving: 1 to 2 capsules a day with water, taken with food. Two capsules provide 1,500mg L-arginine HCl, about 1,240mg L-arginine.

Quality: The L-arginine HCl assays at 100.66% against a 98.5–101.0% specification. Its identity is confirmed by infrared absorption, and its optical rotation of +22.5° confirms the L-form.

Format: Vegan HPMC capsule. Ingredients: L-arginine HCl and the capsule shell. Filled in-house at our 5 Star food hygiene rated unit in Essex.

Health claims: L-arginine has no authorised health claims on the GB register. This page sets out the specification only.

Not suitable for: Under 18s, or during pregnancy or breastfeeding. Speak to your GP first if you take blood pressure medication, nitrates, PDE5 inhibitors or anticoagulants, or have a heart, kidney or liver condition.

Price and packs: 60, 120, 200, 300 and 500 capsules, from £8.99. The 300 pack works out at 7.7p per capsule.

How do I take it?

Take 1 to 2 capsules daily with water, with food.

At 1 capsule a day you take 750mg L-arginine HCl (about 620mg L-arginine). At 2 capsules a day the total is 1,500mg L-arginine HCl (about 1,240mg L-arginine).

Do not exceed 2 capsules a day. Start with 1 capsule for the first week. Food supplements should not replace a varied, balanced diet and a healthy lifestyle.

What exactly is in each capsule?

Each capsule holds 750mg of L-arginine hydrochloride. The capsule shell is HPMC (hydroxypropyl methylcellulose), a plant-derived material, which makes the product suitable for vegans and vegetarians. That is the whole ingredient list.

L-arginine is one of the 20 amino acids the body uses to build proteins. It is found in everyday protein foods such as meat, fish, dairy, eggs, nuts, seeds and pulses. It is called "conditionally essential" because healthy adults make some of their own, while intake from food makes up the rest.

We fill these capsules ourselves in our Southend-on-Sea unit instead of buying them in finished. That way we control the fill weight, the ingredient list and the packing from start to finish.

750mg of L-arginine HCl: how much L-arginine is that?

L-arginine is sold as a hydrochloride salt because the salt is more stable and handles better in a capsule filler. Part of the weight of the salt is the hydrochloride, so the amino acid content is lower than the headline figure.

L-arginine has a molecular weight of 174.20 and L-arginine HCl has a molecular weight of 210.66, so the salt is 82.7% L-arginine by weight.

When you compare products, check whether the figure on the label is the salt or the amino acid. A "1,000mg L-arginine" label and a "1,000mg L-arginine HCl" label are not the same amount.

No Authorised Claims Does Not Mean No Research

You will notice this page tells you nothing about what L-arginine does. That is not because nothing is known — L-arginine is one of the most studied amino acids in the world. It is because getting a health claim authorised in Great Britain is a process most ingredients never go through.

Authorisation is funded by whoever stands to profit from the claim, and no company will spend six figures on an ingredient any competitor can then sell. So amino acids like L-arginine sit outside the register regardless of the evidence behind them. The lawful position is that we sell you a specification and you make your own decisions — which is what the rest of this page does.

Check the register yourself: GB Nutrition and Health Claims Register.

What is the full specification?

What are the ingredients?

Ingredients: L-Arginine Hydrochloride, Capsule Shell (Hydroxypropyl Methylcellulose).

The capsule is filled with L-arginine HCl alone. The capsule shell is the only other component.

What does the certificate of analysis confirm?

The L-arginine HCl in our current batch comes from a UK ingredient supplier. Its certificate of analysis confirms:

• Assay 100.66%, inside the 98.5–101.0% specification.
• Identity confirmed by infrared absorption.
• Optical rotation +22.5°, which is how the test tells L-arginine apart from its mirror-image D-form.
• Loss on drying 0.07% and ash 0.05%, both well inside their limits.
• Heavy metals within limits for lead, cadmium, mercury and arsenic.
• Microbiology clear: E. coli, Salmonella, coliforms and S. aureus all negative.

We fill and pack every batch ourselves in our own unit. L-arginine HCl absorbs moisture from the air, so reseal the pouch after each use and store it somewhere cool and dry.

To see the certificate for your batch, send us the batch number from your pouch through our contact page.

Does it contain any allergens?

None of the ingredients is one of the 14 major allergens: celery, cereals containing gluten, crustaceans, eggs, fish, lupin, milk, molluscs, mustard, tree nuts, peanuts, sesame, soya, and sulphur dioxide and sulphites.

Who should check with a GP first?

• Anyone taking blood pressure medication, nitrates (such as GTN for angina), PDE5 inhibitors (such as sildenafil or tadalafil) or anticoagulants.
• Anyone who has had a heart attack, or who has heart, kidney or liver disease.
• Anyone with diabetes who takes glucose-lowering medication.
• Anyone who gets cold sores (herpes simplex) often.
• Anyone due to have surgery within the next two weeks.
• Not for under 18s, or during pregnancy or breastfeeding. Keep out of reach of children.

Which pack size is best value?

The 300 pack costs 49% less per capsule than the 60 pack. At 1 capsule a day, every pack lasts twice as long.

Subscribe & Save 10% — choose Monthly Subscription in the options above and each delivery comes at 10% off. Pay in three with Klarna, or check out in one tap with Shop Pay.

Wholesale · Trade · Bulk

Do you supply L-arginine HCl capsules wholesale?

Trade buyers look for wholesale L-arginine capsules, bulk L-arginine HCl capsules, L-arginine capsules wholesale UK, L-arginine 750mg bulk, trade L-arginine supplier, L-arginine HCl capsule manufacturer UK, private label L-arginine capsules, white label L-arginine, L-arginine capsules for resale, bulk vegan L-arginine capsules, L-arginine B2B supplier, gym supplement wholesale, amino acid capsules wholesale, L-arginine contract encapsulation and UK L-arginine distributor. All of these are handled through one enquiry.

Minimum order? Ask about the quantity you need. We quote on any trade volume.

Pricing? Tiered by volume, quoted per enquiry.

Documentation? A certificate of analysis for each batch, plus the ingredient specification.

Lead time? Stock sizes ship the same day. Larger runs are quoted on enquiry.

White label? Yes — ask about filling under your own brand.

Send a trade enquiry →

These are real comments left by buyers of this product on our eBay listing, copied word for word. eBay feedback rates the whole purchase, including delivery and service, so we show the comments as written and do not turn them into a star score.

What else do customers buy?

Why buy from Charge Products?

Where can I buy Nitric Oxide PRO?

Here, direct: every pack size from 60 to 500 capsules, Subscribe & Save 10%, Klarna and Shop Pay, with same-day dispatch before 3:30pm, Monday to Friday.

On eBay: the same capsules from the same batches, on our Nitric Oxide PRO listing, if you would rather buy through eBay.

How was this page written?

The figures on this page come from our own fill specification and the supplier's certificate of analysis for L-arginine HCl. The L-arginine content was worked out from published molecular weights. We checked the wording against the GB Nutrition and Health Claims Register.

Charge Products has traded since 2016 and holds a 5 Star Food Hygiene Rating for our Southend-on-Sea unit. This page was last reviewed in November 2026.

Frequently asked questions

How much L-arginine is in one Nitric Oxide PRO capsule?

Each Nitric Oxide PRO capsule contains 750mg of L-arginine HCl, which provides approximately 620mg of L-arginine, because the hydrochloride salt is 82.7% L-arginine by weight.

How many Nitric Oxide PRO capsules should I take a day?

Take 1 to 2 Nitric Oxide PRO capsules a day with water and food, and do not exceed 2 capsules a day. Two capsules provide 1,500mg L-arginine HCl, about 1,240mg L-arginine.

What is the difference between L-arginine and L-arginine HCl?

L-arginine HCl is the hydrochloride salt of the amino acid L-arginine. It is more stable for capsule filling, and it contains 82.7% L-arginine by weight, so 750mg of L-arginine HCl provides about 620mg of L-arginine.

How pure is the L-arginine HCl in Nitric Oxide PRO?

The L-arginine HCl in Nitric Oxide PRO assays at 100.66% on its certificate of analysis, against a 98.5–101.0% specification. Its identity is confirmed by infrared absorption, and an optical rotation of +22.5° confirms the L-form.

Are Nitric Oxide PRO capsules vegan?

Yes. Nitric Oxide PRO capsules contain only L-arginine HCl and a plant-derived HPMC capsule shell, so they are suitable for vegans and vegetarians.

Does Nitric Oxide PRO contain fillers?

No. The only ingredients in Nitric Oxide PRO are L-arginine HCl and the HPMC capsule shell. Nothing else goes into the capsule.

Can I take L-arginine with blood pressure medication?

Speak to your GP or pharmacist before taking L-arginine capsules if you take blood pressure medication, nitrates, PDE5 inhibitors such as sildenafil or tadalafil, or anticoagulants.

Which Nitric Oxide PRO pack is the best value?

The 300-capsule pack of Nitric Oxide PRO is the best value at £22.99, or 7.7p per capsule. That is 49% less per capsule than the 60-capsule pack, and it lasts 150 days at 2 capsules a day.

Where are Nitric Oxide PRO capsules made?

Nitric Oxide PRO capsules are filled in-house by Charge Products at our 5 Star Food Hygiene rated unit in Southend-on-Sea, Essex, UK.

Can I buy Nitric Oxide PRO on eBay?

Yes. Charge Products sells the same Nitric Oxide PRO capsules, from the same batches, on eBay listing 154633646148, where 282 units have sold.

Who should not take L-arginine capsules?

L-arginine capsules are not for under 18s, or during pregnancy or breastfeeding. Anyone who has had a heart attack, has heart, kidney or liver disease, or takes prescription medication should speak to their GP first.

Food supplement. Do not exceed the recommended daily intake. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. Keep out of reach of children. Not intended to diagnose, treat, cure or prevent any disease. If you are pregnant, breastfeeding, taking medication or under medical supervision, consult your GP before use. Charge Products, Big Idea Services Ltd, Unit 1, 8 Towerfield Road, Southend-on-Sea, Essex SS3 9QE.