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Niacin (vitamin B3)

Also called niacin, vitamin B3, niacinamide and 4 more

nicotinamide, nicotinic acid, inositol hexanicotinate, no-flush niacin.

The best price per 500 mg and per month, form by form, across 4 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing niacin (vitamin B3)

We count the vitamin B3 a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Niacin (vitamin B3) comes as niacin (nicotinic acid), niacinamide and inositol hexanicotinate (no-flush), 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 niacin (vitamin B3) with other ingredients are listed separately, because their price buys more than vitamin B3. 500 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Niacinamide (vitamin B3)

Prices last checked: . Ranked purely by price per 500 mg — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Compared at 500 mg. Enter the amount you take to see your own costs.

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Niacin (vitamin B3), Niacinamide: products ranked by price per 500 mg
RankProductPer 500 mgPer monthLastsBuyHow it is worked out
1
Myvitamins Niacinamide Tablets
Cheapest per doseNiacinamide TabletsMyprotein · 90 tablets · 90 servings · 450 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
6p£1.853 months£4.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49AmazonFind 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 × 450 mg = 40.5 g
  • £4.99 ÷ 40.5 g × 500 mg = 6.16p per 500 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “90Tablets”
  • units per serving “Consume 1 tablet as a daily serving”
  • amount per serving “Niacin ; 450mg ; 2813”

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2
Myvitamins Niacinamide Tablets
Niacinamide TabletsMyprotein · 30 tablets · 30 servings · 450 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
11p£3.3227 days£2.99View at Myprotein (opens in a new tab)Free delivery over £55.00, otherwise £4.49AmazonFind it on Amazon (opens in a new tab)A search, not a matched product. Price not compared.
Show the working
  • Servings: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 450 mg = 13.5 g
  • £2.99 ÷ 13.5 g × 500 mg = 11.1p per 500 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30Tablets”
  • units per serving “Consume 1 tablet as a daily serving”
  • amount per serving “Niacin ; 450mg ; 2813”

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3
Thorne Niacinamide
NiacinamideHealf · 180 capsules · 180 servings · 500 mg a servingDetails and price historyAdd to my stack
11p£3.426 months£20.49View 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: 180 ÷ 1 per serving = 180
  • In the pack: 180 × 500 mg = 90 g
  • £20.49 ÷ 90 g × 500 mg = 11.4p per 500 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “180 caps”
  • servings stated “Servings Per Container: 180”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “Niacin (as Niacinamide) ; 500 mg NE”

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4
Nature's Best Vitamin B3 (Niacin) 250mg - Maximum Strength, Highly Absorbable
Vitamin B3 (Niacin) 250mg - Maximum Strength, Highly Absorbable100 tablets · 100 servings · 250 mg a servingDetails and price historyAdd to my stackTesting claimed on labelclaimed: veganclaimed: vegetarian
15p£4.5050 days£7.50View 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: 100 ÷ 1 per serving = 100
  • In the pack: 100 × 250 mg = 25 g
  • £7.50 ÷ 25 g × 500 mg = 15p per 500 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 100 Tablets”
  • units per serving “in a convenient, one-a-day dose”
  • amount per serving “Our high-strength niacin tablets deliver a full 250mg of vitamin B3”

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5
Biocare Vitamin B3
Vitamin B3Healf · 30 capsules · 30 servings · 100 mg a servingDetails and price historyAdd to my stackclaimed: vegan
£1.03£30.956 days£6.19View 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: 30 ÷ 1 per serving = 30
  • In the pack: 30 × 100 mg = 3 g
  • £6.19 ÷ 3 g × 500 mg = £1.03 per 500 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “30 caps”
  • units per serving “per daily intake: 1 capsule”
  • amount per serving “Niacin (B3) ; 100mg”

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By shop

Each shop's niacin (vitamin B3) products, with where its cheapest sits in the market.

How we work out these prices

We count the amount of vitamin B3 per serving as stated on the label.

Questions

Where can I buy niacin (vitamin B3) cheapest in the UK?

On 20 October 2026, the cheapest niacin (vitamin B3) per dose from a UK seller was Niacinamide Tablets at Myprotein (6p per 500 mg, £1.85 a month). Then Niacinamide Tablets at Myprotein (11p per 500 mg, £3.32 a month) and Niacinamide at Healf (11p per 500 mg, £3.42 a month). That is by price per 500 mg, across 3 UK retailers and 5 products, with every price checked daily; the table above shows the working for each.

What is the best price per 500 mg of niacin (vitamin B3) today?

6p per 500 mg, for Niacinamide Tablets at Myprotein (6p per 500 mg, £1.85 a month), on 20 October 2026. The dearest of the 5 products we price is £1.03 per 500 mg, and the middle one is 11p.

How much does niacin (vitamin B3) cost per month?

At one 500 mg dose a day, the cheapest works out at £1.85 a month, for Niacinamide Tablets at Myprotein, on 20 October 2026. Across the 5 products we price it runs from £1.85 to £30.95 a month. A month is 30 days, and the figure follows the dose you enter in the table.

Which niacin (vitamin B3) form is cheapest per dose?

On 20 October 2026: niacinamide from 6p per 500 mg (Myprotein), niacin (nicotinic acid) from 25p per 500 mg (Lloyds Pharmacy) and inositol hexanicotinate (no-flush) from 34p per 500 mg (Healf). 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 niacin (vitamin B3) last?

At one 500 mg dose a day, the packs we price last from 6 days to 6 months; the middle one lasts 50 days. Each row says how long its pack lasts at the dose you enter.

What does “per 500 mg” mean?

It is the unit we use to put every product on the same scale: the price of 500 mg of vitamin B3, 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 niacin (vitamin b3) 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: Niacin (nicotinic acid); Niacinamide; Inositol hexanicotinate (no-flush).

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.