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Riboflavin (vitamin B2)

Also called riboflavin, vitamin B2, riboflavin-5-phosphate, r5p.

The best price per 100 mg and per month, form by form, across 2 UK retailers, and where to buy it cheapest. A unit for comparing, not advice.

Comparing riboflavin (vitamin B2)

We count the riboflavin a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Riboflavin (vitamin B2) comes as riboflavin and riboflavin-5-phosphate, 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 riboflavin (vitamin B2) with other ingredients are listed separately, because their price buys more than riboflavin. 100 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Riboflavin (vitamin B2)

Prices last checked: . Ranked purely by price per 100 mg — a comparison unit, not a recommendation. We earn commission when you buy through these links; it never affects the order.

Compared at 100 mg. Enter the amount you take to see your own costs.

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Riboflavin (vitamin B2), Riboflavin: products ranked by price per 100 mg
RankProductPer 100 mgPer monthLastsBuyHow it is worked out
1
Seeking Health Riboflavin
Cheapest per doseRiboflavinHealf · 60 capsules · 60 servings · 400 mg a servingDetails and price historyAdd to my stackclaimed: vegan
8p£2.318 months£18.49View 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: 60 ÷ 1 per serving = 60
  • In the pack: 60 × 400 mg = 24 g
  • £18.49 ÷ 24 g × 100 mg = 7.7p per 100 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “60 capsules”
  • servings stated “Servings Per Container: 60”
  • units per serving “Serving Size: 1 Capsule”
  • amount per serving “delivers 400 mg of vitamin B2 in every capsule”

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2
SOLGAR Vitamin B2 100mg
Best value under 6 months' supplyVitamin B2 100mgHealf · 100 capsules · 100 servings · 100 mg a servingDetails and price historyAdd to my stack
9p£2.763 months£9.21View 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: 100 ÷ 1 per serving = 100
  • In the pack: 100 × 100 mg = 10 g
  • £9.21 ÷ 10 g × 100 mg = 9.21p per 100 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “100 capsules”
  • units per serving “Each vegetable capsule provides:”
  • amount per serving “Riboflavin ; 100 mg”

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3
Nature's Best Vitamin B2 (Riboflavin) 50mg - High Strength Formula
Vitamin B2 (Riboflavin) 50mg - High Strength Formula100 capsules · 100 servings · 50 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
13p£3.9050 days£6.50View 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 × 50 mg = 5 g
  • £6.50 ÷ 5 g × 100 mg = 13p per 100 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 100 Capsules”
  • amount per serving “provides a full 50mg of riboflavin B2 in each small, easy to swallow capsule”

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By shop

Each shop's riboflavin (vitamin B2) products, with where its cheapest sits in the market.

How we work out these prices

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

Questions

Where can I buy riboflavin (vitamin B2) cheapest in the UK?

On 20 October 2026, the cheapest riboflavin (vitamin B2) per dose from a UK seller was Riboflavin at Healf (8p per 100 mg, £2.31 a month). Then Vitamin B2 100mg at Healf (9p per 100 mg, £2.76 a month) and Vitamin B2 (Riboflavin) 50mg - High Strength Formula at Lamberts Healthcare (Nature's Best) (13p per 100 mg, £3.90 a month). That is by price per 100 mg, across 2 UK retailers and 3 products, with every price checked daily; the table above shows the working for each.

What is the best price per 100 mg of riboflavin (vitamin B2) today?

8p per 100 mg, for Riboflavin at Healf (8p per 100 mg, £2.31 a month), on 20 October 2026. The dearest of the 3 products we price is 13p per 100 mg, and the middle one is 9p.

How much does riboflavin (vitamin B2) cost per month?

At one 100 mg dose a day, the cheapest works out at £2.31 a month, for Riboflavin at Healf, on 20 October 2026. Across the 3 products we price it runs from £2.31 to £3.90 a month. A month is 30 days, and the figure follows the dose you enter in the table.

Which riboflavin (vitamin B2) form is cheapest per dose?

On 20 October 2026: riboflavin from 8p per 100 mg (Healf) and riboflavin-5-phosphate from £1.06 per 100 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 riboflavin (vitamin B2) last?

At one 100 mg dose a day, the packs we price last from 50 days to 8 months; the middle one lasts 3 months. Each row says how long its pack lasts at the dose you enter.

What does “per 100 mg” mean?

It is the unit we use to put every product on the same scale: the price of 100 mg of riboflavin, 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 riboflavin (vitamin b2) 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: Riboflavin; Riboflavin-5-phosphate.

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.