Paula Radcliffe · 2:15:25

130-mile weeks. One daily drink.

At her peak Paula ran around five marathons' worth of miles a week. The one constant through all of it, from 1998 to today: Immufix, stirred into water after a session.

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£41.60first month with TRYIMMUFIXThen £52 a month, 3-month minimum. Or £52 one-time with the code, usually £65.

Since 1998
Made in Cambridgeshire
30-day money-back guarantee

Vitamin C, vitamin D, zinc and selenium contribute to the normal function of the immune system.

Magnesium contributes to normal muscle function.

Paula Radcliffe holding a pouch of Immufix Vanilla — Paula RadcliffeMarathon world record holder, 2003 to 2019

4.8out of 5 from 89 reviews

87 of 89reviews give it 4 or 5 stars

1998the year Paula started taking it

Cambridgeshiremade in the company's own facility

The training load

What a record is built on.

The numbers behind 2:15:25, from Paula's own story.

130miles in Paula's peak training weeks, about five marathons

“Behind it are 130-mile training weeks.”

Immufix
Our story

16 yearsthe 2:15:25 world record stood, London 2003 to 2019

“Paula set the women’s marathon world record of 2:15:25 in 2003, a mark that stood for an incredible 16 years.”

Immufix
My Immufix journey, Paula Radcliffe

28 yearsof the same daily drink, from 1998 to today

“One product that remained a constant part of her health and wellness routine for more than 28 years is Immufix.”

Immufix
My Immufix journey, Paula Radcliffe

Brian Welsby, the biochemist behind Immufix, also developed the drinks that fuelled Paula's marathon preparation.

Paula Radcliffe racing the London Marathon

The training load

Months of training add up.

A marathon block is weeks of mileage, sessions and long runs, on top of work and everything else. The miles get the attention. The daily basics are what keep the block going week after week.

It's cumulative
Every session builds on the last, and so do the demands on your body.
Consistency is the whole game
A block only works if you keep showing up. The same goes for nutrition.
It should be simple
After a hard session, the last thing you want is a cupboard of tubs to work through.

What's in it for training

Nutrients that matter when you train.

One drink after a session. What the key nutrients contribute to, in the wording UK law allows:

Magnesium
Contributes to normal muscle function, normal energy-yielding metabolism and the reduction of tiredness and fatigue.

B vitamins
Riboflavin, niacin and pantothenic acid contribute to normal energy-yielding metabolism and to the reduction of tiredness and fatigue.

Vitamin D
Contributes to the normal function of the immune system and to the maintenance of normal bones and normal muscle function.

Vitamin C
Contributes to the normal function of the immune system and to the reduction of tiredness and fatigue.

Shop Now30-day money-back guarantee on your first pouch

How it started

Built by a biochemist, in 1998.

Immufix wasn't designed in a marketing meeting. It started as one man's answer to a question most supplement makers skip.

Brian Welsby, the biochemist who built the formula

1998

Brian Welsby's Breakthrough.

Biochemist Brian Welsby built a daily formula around Food State nutrition: minerals cultured in yeast, vitamins complexed the way they occur in food. He called it Breakthrough.

1998

Denise Lewis makes the introduction.

Denise Lewis, who went on to win Olympic gold in Sydney, introduced Paula to Brian. Paula, then 24, started taking the formula every day.

2003

2:15:25 in London.

Peak training weeks ran to 130 miles, and Brian also developed the drinks that fuelled her marathon preparation. The world record she set stood for sixteen years.

2026

The customers buy the company.

Paula and five friends, people she had introduced to the formula over the years, bought the company that makes it. Breakthrough is now Immufix, still made in Cambridgeshire.

From Paula's own account and the company's story. Read Paula's full story.

Paula Radcliffe

Paula, in her own words.

“Hard work, dedication and training were always at the heart of my success.”Paula Radcliffe

“The marathon asks a lot of your body.”Paula Radcliffe, in her video

2:15:25Marathon world record, London 2003. It stood for 16 years.

3 + 3London Marathon and New York City Marathon wins

4Olympic Games for Great Britain

GoldWorld, European and Commonwealth championships

Paula is a co-owner of the company that makes Immufix. Her account is her own experience, not health advice.

The formula

Also in every serving.

Vitamins, minerals and plant nutrients, with what each one contributes to in the wording UK law allows.

Zinc

Contributes to the normal function of the immune system and to the maintenance of normal skin, hair and nails.

Selenium

Contributes to the normal function of the immune system and to normal thyroid function.

Prebiotic FOS

A prebiotic fibre, declared on the label with every other ingredient.

Citrus bioflavonoids

Plant nutrients from citrus, carried alongside the vitamin C.

Every declared amount, nutrient by nutrient, is on the label in the shop below and on The Science page. See The Science page.

Is it for you

It's for you if:

130-mile training weeks and a world record that stood for 16 years. The daily drink Paula Radcliffe mixes after a session, since 1998.

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You train for an event, or just train most days.
You want one thing to take after a session.
You'd rather not manage a cupboard of tubs.
You want a drink you can mix in a bottle.

Customer reviews

What customers are saying.

Dissolves very easy. Flavour is one to my taste but it’s only a small amount a day

I have been taken it every day for about 2 years. BUY

I take immufix everyday. Would recommend

Thank you for the fantastic service I received and my immufix order came the very next day. Very good company to deal with and I highly recommend immufix. J.Laing.

Long standing customer of immufix, and your service is excellent. Would recommend.

There is no other product like it. It get's my recommendation any day.

After you order

What happens next.

Today
Dispatched
Order before 2pm on a weekday and it leaves the same day by Royal Mail 48.
2 to 3 working days
On your doorstep
Free standard UK delivery on every order, tracked.
Every day
One drink
Stir a 25g serving into around 200ml of cold water. Orange or vanilla.
Up to 30 days
Your guarantee
Not for you? We refund your first pouch, less £10 shipping and handling.
After 3 months
Your call
On subscription, pause, skip or cancel any time up to 7 days before renewal.

Paula's code

Your first order, 20% off.

Code TRYIMMUFIX is added at checkout when you order from this page. One use per customer.

One pouch

£52 ~~£65~~

A single 750g pouch, 30 servings. No subscription.

Buy once

TRYIMMUFIX 30-day money-back guarantee on your first pouch, less £10 shipping and handling Free tracked UK delivery

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Daily Immune Support.

Choose your flavour, then subscribe or buy once. Your code is applied at checkout.

Immufix Orange with its nutrient sources

750g · 30 servings · one month

Daily Immune Support

Vitamins, minerals and plant nutrients in a daily drink. The formula Paula Radcliffe has taken every day since 1998.

4.8 out of 5 · 89 reviews

30‑day money-back guaranteeMade in the UKTracked UK delivery

Flavour

Purchase option

Start subscription · £52

Dispatched the same day on weekday orders placed before 2pm.

Free standard UK delivery. Royal Mail 48 tracked, 2 to 3 working days. UK addresses only.

30‑day money-back guarantee. Try your first pouch of IMMUFIX for up to 30 days. If it’s not for you, we’ll refund your first qualifying pouch, less £10 shipping and handling. First purchase only. T&Cs apply.

Checkout completes securely on immufix.com

We accept

Vitamin C, vitamin D, zinc and selenium contribute to the normal function of the immune system. B vitamins and magnesium contribute to normal energy‑yielding metabolism and to the reduction of tiredness and fatigue. Vitamin E contributes to the protection of cells from oxidative stress.

Per 25g serving: Vitamin A 200µg, Vitamin D3 1.25µg, Vitamin E 2.5mg, Vitamin C 100mg, Vitamin K 10µg, Thiamin 0.25mg, Riboflavin 0.35mg, Niacin 4.5mg, Pantothenic acid 1.5mg, Vitamin B6 0.5mg, Vitamin B12 0.25µg, Biotin 37µg, Folic acid 50µg, Iron 1.25mg, Zinc 3.75mg, Iodine 37.5µg, Copper 0.12mg, Selenium 75µg, Magnesium 70mg, Chromium 50µg. Calcium, manganese and potassium are also present at trace levels, so they are not declared on the label.

Functional nutrients: prebiotic FOS (included as part of the fibre content), L‑glutamine 1g, Taurine 500mg, L‑methionine 250mg, CLA 365mg, Soya isoflavones 45mg, Citrus bioflavonoids 28mg, Choline 1.25mg, Inositol 1.25mg, Boron 0.25mg, PABA 1.25mg.

Per serving: 75 kcal, 2.1g protein, 13.2g carbohydrate (of which sugars 9.9g), 6.9g prebiotic FOS. Allergens: contains soya. Vegetarian, and Orange is also suitable for vegans. Gluten free. No artificial colours, flavours or preservatives. See the full glossary →

One 25g scoop into around 200ml of cold water, once a day. Stir or shake and drink. Most people take it first thing in the morning so the habit sticks.

Food supplement. Do not exceed the stated recommended daily dose. Keep out of reach of young children. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.

You save 20% on every order, forever. The subscription runs for a minimum of three months, so the minimum commitment is three payments of £52 (£156). After that you can pause, skip or cancel whenever you like from your online account, and any change needs to be made up to 7 days before your next renewal so we don’t dispatch it first. Your 14-day statutory right to cancel still applies from the day your first pouch arrives, and the first pouch carries the 30-day money-back guarantee.

Free standard UK delivery on every order. Orders before 2pm dispatch the same day via Royal Mail 48 (2 to 3 working days). Express is available at checkout for £4.65.

30‑day money-back guarantee. Try your first pouch of IMMUFIX for up to 30 days. If it’s not for you, we’ll refund your first qualifying pouch, less £10 shipping and handling. First purchase only. T&Cs apply.

Unopened orders you no longer want fall under standard returns: tell us within 14 days of delivery, send it back sealed within 14 days of telling us, and we refund it in full.

FAQ

Questions, answered.

Stir a 25g serving into around 200ml of cold water once a day and drink. Most people take it in the morning so it becomes a habit.

There are two natural flavours, orange and vanilla. No artificial colours, flavours or preservatives.

Every declared amount is printed on the label and listed on The Science page, with what each nutrient contributes to. See the full label

You save 20% on every order, £52 instead of £65, delivered monthly, with a minimum term of three months. Pause, skip or cancel after that, up to 7 days before renewal. Read the full terms

Try your first pouch of IMMUFIX for up to 30 days. If it's not for you, we'll refund your first qualifying pouch, less £10 shipping and handling. First purchase only. T&Cs apply

Speak to your GP or pharmacist before starting any food supplement if you take medication.

Free standard UK delivery on every order. Orders placed before 2pm on a weekday dispatch the same day by Royal Mail 48, which takes 2 to 3 working days.

Since 1998

The drink Paula has taken for 28 years.

Vitamins, minerals and plant nutrients in one daily drink, made in Cambridgeshire. £41.60 for your first month with TRYIMMUFIX.

Shop Now

130-mile weeks. One daily drink.

What a record is built on.

Months of training add up.

It's cumulative

Consistency is the whole game

It should be simple

Nutrients that matter when you train.

Magnesium

B vitamins

Vitamin D

Vitamin C

Built by a biochemist, in 1998.

Brian Welsby's Breakthrough.

Denise Lewis makes the introduction.

2:15:25 in London.

The customers buy the company.

Paula, in her own words.

Also in every serving.

It's for you if:

What customers are saying.

What happens next.

Dispatched

On your doorstep

One drink

Your guarantee

Your call

Your first order, 20% off.

Subscribe

One pouch

Daily Immune Support.

Daily Immune Support

Questions, answered.

The drink Paula has taken for 28 years.