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Thiamine (vitamin B1)

Also called thiamine, thiamin, vitamin B1, benfotiamine.

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 thiamine (vitamin B1)

We count the thiamine a label states per serving, whatever the pack size or the serving size, so every product sits on one scale. Thiamine (vitamin B1) comes as thiamine and benfotiamine, 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 thiamine (vitamin B1) with other ingredients are listed separately, because their price buys more than thiamine. 100 mg is our unit for comparing prices, not a dose to take: the label’s directions and a pharmacist decide that.

Thiamine (vitamin B1)

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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Thiamine (vitamin B1), Thiamine: products ranked by price per 100 mg
RankProductPer 100 mgPer monthLastsBuyHow it is worked out
1
Nature's Best Vitamin B1 (Thiamin) 100mg - Supports Nervous System, Heart Health & Psychological Function
Cheapest per doseVitamin B1 (Thiamin) 100mg - Supports Nervous System, Heart Health & Psychological Function90 capsules · 90 servings · 100 mg a servingDetails and price historyAdd to my stackclaimed: veganclaimed: vegetarian
8p£2.503 months£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: 90 ÷ 1 per serving = 90
  • In the pack: 90 × 100 mg = 9 g
  • £7.50 ÷ 9 g × 100 mg = 8.33p per 100 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “Specifications: 90 Capsules”
  • amount per serving “provide a full 100mg of highly absorbable pure nutrition grade vitamin B1”

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2
Natures Aid Vitamin B1 100mg 90 Tablets
Vitamin B1 100mg 90 TabletsNatures Aid · Lloyds Pharmacy · 90 tablets · 90 servings · 100 mg a servingDetails and price historyAdd to my stack
13p£3.833 months£11.49View at Lloyds Pharmacy (opens in a new tab)Free delivery over £30.00, otherwise £2.99AmazonFind 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 × 100 mg = 9 g
  • £11.49 ÷ 9 g × 100 mg = 12.8p per 100 mg
  • Amount per serving: stated on the label.
What the retailer's listing says
  • pack units “90 Tablets”
  • units per serving “Take one tablet daily”
  • amount per serving “Vitamin B1 100mg”

Is this wrong? Tell us

How we work out these prices

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

Questions

Where can I buy thiamine (vitamin B1) cheapest in the UK?

On 20 October 2026, the cheapest thiamine (vitamin B1) per dose from a UK seller was Vitamin B1 (Thiamin) 100mg - Supports Nervous System, Heart Health & Psychological Function at Lamberts Healthcare (Nature's Best) (8p per 100 mg, £2.50 a month). Then Vitamin B1 100mg 90 Tablets at Lloyds Pharmacy (13p per 100 mg, £3.83 a month). That is by price per 100 mg, across 2 UK retailers and 2 products, with every price checked daily; the table above shows the working for each.

What is the best price per 100 mg of thiamine (vitamin B1) today?

8p per 100 mg, for Vitamin B1 (Thiamin) 100mg - Supports Nervous System, Heart Health & Psychological Function at Lamberts Healthcare (Nature's Best) (8p per 100 mg, £2.50 a month), on 20 October 2026. The dearest of the 2 products we price is 13p per 100 mg, and the middle one is 11p.

How much does thiamine (vitamin B1) cost per month?

At one 100 mg dose a day, the cheapest works out at £2.50 a month, for Vitamin B1 (Thiamin) 100mg - Supports Nervous System, Heart Health & Psychological Function at Lamberts Healthcare (Nature's Best), on 20 October 2026. Across the 2 products we price it runs from £2.50 to £3.83 a month. A month is 30 days, and the figure follows the dose you enter in the table.

How long does a pack of thiamine (vitamin B1) last?

At one 100 mg dose a day, the packs we price last from 3 months to 3 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 thiamine, 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 thiamine (vitamin b1) 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: Thiamine; Benfotiamine.

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.