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L-Arginine

Also called arginine, arginine akg, aakg, arginine alpha-ketoglutarate.

The best price per 3 g and per month, form by form, across 8 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing L-Arginine

We count the L-arginine a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. L-Arginine comes as L-Arginine and arginine AKG, and each form has its own table, because someone buying one would not usually take another as a like-for-like substitute. Products that combine L-Arginine with other ingredients are listed separately, because their price buys more than L-arginine. 3 g is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

L-Arginine

Prices last checked: . Ranked purely by price per 3 g — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Compared at 3,000 mg. Enter the amount you take to see your own costs.

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L-Arginine, L-Arginine: products ranked by price per 3 g
RankProductPer 3 gPer monthLastsBuyHow it is worked out
1
Bulk L Arginine
Cheapest per doseL Arginine1 kg · 333.3 servings · 3 g a servingDetails and price historyAdd to my stack
8p£2.4511 months£27.19View at Bulk (opens in a new tab)Free delivery over £49.00, otherwise £3.95AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 1000 ÷ 3 per serving = 333.3
  • In the pack: 333.3 × 3 g = 1,000 g
  • £27.19 ÷ 1,000 g × 3 g = 8.16p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “1kg”
  • units per serving “Per Serving (3 g)”
  • amount per serving “[L-Arginine ; 3g]”

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2
Bulk L Arginine
Best value under 6 months' supplyL Arginine500 g · 166.7 servings · 3 g a servingDetails and price historyAdd to my stack
16p£4.865 months£26.99View at Bulk (opens in a new tab)Free delivery over £49.00, otherwise £3.95AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 500 ÷ 3 per serving = 166.7
  • In the pack: 166.7 × 3 g = 500 g
  • £26.99 ÷ 500 g × 3 g = 16.2p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “500g”
  • units per serving “Per Serving (3 g)”
  • amount per serving “[L-Arginine ; 3g]”

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3
NOW Foods L-Arginine - 1,000 mg
L-Arginine - 1,000 mgHealf · 120 tablets · 120 servings · 1 g a servingDetails and price historyAdd to my stackclaimed: vegetarian
38p£11.3040 days£15.06View at Healf (opens in a new tab)Free delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 ÷ 1 per serving = 120
  • In the pack: 120 × 1 g = 120 g
  • £15.06 ÷ 120 g × 3 g = 37.7p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “120 caps”
  • units per serving “Serving Size: 1 Tablet”
  • amount per serving “L-Arginine HCl) (1,000 mg) ; 1 g”
  • compound mass “from 1,250 mg L-Arginine HCl”

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4
Bio-Synergy® Arginine
Arginine125 capsules · 125 servings · 1 g a servingDetails and price historyAdd to my stack
41p£12.2342 days£16.99View at Bio-Synergy (opens in a new tab)Free delivery over £49.00; below that, not knownAmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 125 ÷ 1 per serving = 125
  • In the pack: 125 × 1 g = 125 g
  • £16.99 ÷ 125 g × 3 g = 40.8p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 125 caps”
  • amount per serving “With 1000mg L-arginine in each capsule”

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5
Nature's Best L-Arginine 1000mg - High Strength
L-Arginine 1000mg - High Strength90 tablets · 90 servings · 1 g a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
47p£13.9530 days£13.95View at Lamberts Healthcare (Nature's Best) (opens in a new tab)Free delivery over £20.00, otherwise £2.50AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 1 g = 90 g
  • £13.95 ÷ 90 g × 3 g = 46.5p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “90 Tablets”
  • amount per serving “1000mg L-Arginine HCI per tablet”

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6
NOW Foods L-Arginine - 1,000 mg
L-Arginine - 1,000 mgHealf · 60 tablets · 60 servings · 1 g a servingDetails and price historyAdd to my stackclaimed: vegetarian
54p£16.1020 days£10.73View at Healf (opens in a new tab)Free delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 1 g = 60 g
  • £10.73 ÷ 60 g × 3 g = 53.6p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Tablet”
  • amount per serving “L-Arginine HCl) (1,000 mg) ; 1 g”
  • compound mass “from 1,250 mg L-Arginine HCl”

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7
Simply Supplements L-Arginine Capsules 500mg
L-Arginine Capsules 500mg240 capsules · 240 servings · 500 mg a servingDetails and price historyAdd to my stack
60p£17.9940 days£23.99View at Simply Supplements (opens in a new tab)Free delivery from £20.00, otherwise £1.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 240 ÷ 1 per serving = 240
  • In the pack: 240 × 500 mg = 120 g
  • £23.99 ÷ 120 g × 3 g = 60p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • amount per serving “L-Arginine Capsules 500mg”

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8
Lamberts L-Arginine HCl 1000mg
L-Arginine HCl 1000mgLamberts · Vitamin Planet · 90 tablets · 90 servings · 1 g a servingDetails and price historyAdd to my stack
77p£23.1130 days£23.11View at Vitamin Planet (opens in a new tab)Delivery £3.95AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 1 g = 90 g
  • £23.11 ÷ 90 g × 3 g = 77p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “90 Tablets”
  • amount per serving “L-Arginine HCl 1000mg per tablet”

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9
Pure Encapsulations L-Arginine
L-ArginineHealf · 90 capsules · 45 servings · 1.4 g a servingDetails and price historyAdd to my stackclaimed: vegetarian
£1.32£39.5021 days£27.65View at Healf (opens in a new tab)Free delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 90 ÷ 2 per serving = 45
  • In the pack: 45 × 1.4 g = 63 g
  • £27.65 ÷ 63 g × 3 g = £1.32 per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “90 caps”
  • servings stated “Servings Per Container: 45”
  • units per serving “Serving Size: 2 capsules”
  • amount per serving “L-Arginine HCl (Free-Form) ; 1400 mg”

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10
Thorne L-Arginine - Sustained Release
L-Arginine - Sustained ReleaseHealf · 120 capsules · 60 servings · 1 g a servingDetails and price historyAdd to my stack
£1.79£53.6920 days£35.79View at Healf (opens in a new tab)Free delivery over £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 120 ÷ 2 per serving = 60
  • In the pack: 60 × 1 g = 60 g
  • £35.79 ÷ 60 g × 3 g = £1.79 per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “120 caps”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 2 Capsules”
  • amount per serving “L-Arginine^ ; 1 g”

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11
Cytoplan L-Arginine Plus
L-Arginine PlusW-Wellness · 60 capsules · 60 servings · 500 mg a servingDetails and price historyAdd to my stackalso contains ornithine
£2.00£59.9710 days£19.99View at W-Wellness (opens in a new tab)Free delivery from £50.00, otherwise £3.99AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 500 mg = 30 g
  • £19.99 ÷ 30 g × 3 g = £2.00 per 3 g
  • Amount per serving: stated on the label.
  • Also contains: ornithine. The price counts the l-arginine only.
What the retailer's listing says
  • pack units “Contains: 60 capsules”
  • amount per serving “Each capsule provides 500mg of L-arginine”

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12
Bulk L Arginine
L Arginine100 g · 33.3 servings · 3 g a servingDetails and price historyAdd to my stackOut of stock
12p£3.5933 days£3.99View at Bulk (opens in a new tab)Free delivery over £49.00, otherwise £3.95AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 100 ÷ 3 per serving = 33.3
  • In the pack: 33.3 × 3 g = 100 g
  • £3.99 ÷ 100 g × 3 g = 12p per 3 g
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “100g”
  • units per serving “Per Serving (3 g)”
  • amount per serving “[L-Arginine ; 3g]”

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By shop

Each shop's L-Arginine products, with where its cheapest sits in the market.

How we work out these prices

We count the amount of L-arginine per serving as stated on the label.

Questions

Where can I buy L-Arginine cheapest in the UK?

On 20 October 2026, the cheapest L-Arginine per dose from a UK seller was L Arginine at Bulk (8p per 3 g, £2.45 a month). Then L Arginine at Bulk (16p per 3 g, £4.86 a month) and L-Arginine - 1,000 mg at Healf (38p per 3 g, £11.30 a month). That is by price per 3 g, across 7 UK retailers and 12 products, with every price checked daily; the table above shows the working for each.

What is the best price per 3 g of L-Arginine today?

8p per 3 g, for L Arginine at Bulk (8p per 3 g, £2.45 a month), on 20 October 2026. The dearest of the 12 products we price is £2.00 per 3 g, and the middle one is 50p.

How much does L-Arginine cost per month?

At one 3 g dose a day, the cheapest works out at £2.45 a month, for L Arginine at Bulk, on 20 October 2026. Across the 12 products we price it runs from £2.45 to £59.97 a month. A month is 30 days, and the figure follows the dose you enter in the table.

Which L-Arginine form is cheapest per dose?

On 20 October 2026: L-Arginine from 8p per 3 g (Bulk) and arginine AKG from 16p per 3 g (Myprotein). The forms differ in what they contain, so this is a fact about price and not a recommendation of one over another.

How long does a pack of L-Arginine last?

At one 3 g dose a day, the packs we price last from 10 days to 11 months; the middle one lasts 32 days. Each row says how long its pack lasts at the dose you enter.

What does “per 3 g” mean?

It is the unit we use to put every product on the same scale: the price of 3 g of L-arginine, whatever the pack size or serving size. It is a comparison unit, not a recommendation of how much to take. Use the “Your daily dose” box to see costs at the amount you actually take.

Why are the l-arginine forms in separate tables?

We only rank products against others of the same form, because someone buying one form would not usually see another as a like-for-like substitute on price. Forms we compare separately: L-Arginine; Arginine AKG.

Why is a product I have seen in the shops missing?

If a retailer’s listing does not let us confirm the amount per serving, the pack size or the form, we do not guess and we do not show the product. It appears once its label has been read and confirmed.

How up to date are the prices?

Prices on this page were last checked on 20 October 2026. Every table shows the date its prices were checked. Always confirm the price on the retailer’s site before buying.

Do retailers pay to appear higher?

No. We earn a commission when you buy through our links, but the order is set only by price per dose. No retailer or brand can pay for position.