What we’ve been writing.
The story behind the formula, what the science actually says, and the people who have taken it every morning since 1998.
Looking for an AG1 alternative? The facts side by side.
Looking for an AG1 alternative in the UK? Serving size, pack price, sugars and format from each brand's own page, checked 10 October 2026.
10 October 2026 · 5 min read
What antioxidants are, in plain English.
What antioxidants are, what oxidative stress means in plain English, which nutrients hold the authorised claim, and the UK foods that provide them.
10 October 2026 · 7 min read
Who regulates supplements in the UK.
Yes. UK supplements are regulated as food. Who does what: local councils and Trading Standards, the FSA, DHSC, the MHRA, the ASA and the claims register.
10 October 2026 · 7 min read
The best time to take vitamins is the one you keep.
The best time to take vitamins is the time you will keep to. What NHS guidance says about taking supplements with food, and morning versus night.
10 October 2026 · 6 min read
Biotin, what it does and where it is.
Biotin (vitamin B7) foods per 100g from UK government data, what the NHS says about biotin, its authorised claims and the NHS 0.9mg supplement guide.
10 October 2026 · 5 min read
Carb loading for a marathon, in grams.
How many carbs to eat before a marathon: 10 to 12g per kg a day for 36 to 48 hours, 1 to 4g per kg on race morning, with a calculated UK day of meals.
10 October 2026 · 6 min read
Choline and inositol, side by side.
Choline is an essential nutrient found mainly in eggs, liver, meat and fish. Inositol is a ring-shaped compound found in grains, beans, nuts and fruit.
10 October 2026 · 6 min read
What chromium is, and where you find it.
What chromium is, which foods contain it, how much the NHS says adults need, and the one authorised health claim chromium holds in Great Britain.
10 October 2026 · 6 min readCitrus bioflavonoids, explained.
Citrus bioflavonoids are the flavonoids in citrus fruit, such as hesperidin and naringin. Where they are found, how much fruit holds, and the 28mg in Immufix.
10 October 2026 · 5 min read
The clocks go back. Here's what changes.
The clocks go back at 2am on Sunday 25 October 2026. What really happens to UK mornings and evenings, when the darkest days are, and a routine that copes.
10 October 2026 · 4 min read
The clocks go forward on Sunday 28 March 2027.
The UK clocks go forward at 1am on Sunday 28 March 2027. What changes, how much lighter the evenings get city by city, and how to handle the lost hour.
10 October 2026 · 6 min read
Couch to 5K, started in winter.
Couch to 5K in winter: how the free NHS 9-week plan works, three runs a week, and how to fit it around dark mornings, short days, cold and rain.
10 October 2026 · 7 min read
Cold weather, short days and feeling tired.
Does cold weather make you tired? What research shows about winter, sleep and daylight, what is still unknown, and the routine changes that help most.
10 October 2026 · 6 min read
Does vitamin powder expire? What the date means.
Does vitamin powder expire or go off? What the best before date means under UK food law, how to store a powder, and what clumping tells you.
10 October 2026 · 6 min read
Your 5 A Day in the winter months.
NHS 5 A Day portion sizes explained: 80g of fruit or veg, 30g dried, 150ml juice. What counts in winter, including frozen, tinned and soup, and a sample day.
10 October 2026 · 6 min read
Folate and folic acid, side by side.
Folate is the form of vitamin B9 found in food, folic acid is the manmade form. UK food sources per 100g, the NHS daily amount and its 1mg supplement guide.
10 October 2026 · 7 min read
Food state vitamins, what the words mean.
Food state and food grown describe vitamins and minerals cultivated within a food-like matrix such as yeast. What the terms mean, and what UK law says.
10 October 2026 · 6 min readGreens powder or vitamin powder: what is the difference?
Are powder greens worth it, and do you need one? What a greens powder is, how it differs from a vitamin-and-mineral powder, and what the NHS advises.
10 October 2026 · 6 min read
Hair, skin and nails, by the authorised claims.
Which vitamins and minerals hold the UK authorised claims for normal hair, skin and nails, what the wording means, and the foods that supply them.
10 October 2026 · 6 min read
A half marathon nutrition plan, from the week before.
A half marathon nutrition plan for the week before, the night before, race morning, during the run and after, with sourced carbohydrate amounts.
10 October 2026 · 6 min read
Healthy breakfasts, quick enough for a weekday.
Healthy breakfast ideas from the NHS's own recipes, compared by time, protein, fibre and salt, plus quick breakfasts and how to pick a cereal by its label.
10 October 2026 · 6 min read
High fibre breakfasts, counted in grams.
The highest fibre breakfast cereals in the UK ranked per 100g and per bowl, plus seven easy high fibre breakfasts with fibre calculated from CoFID data.
10 October 2026 · 6 min readThe UK's high fibre foods, by the gram.
The UK foods with the most fibre, with AOAC fibre per 100g from the government's CoFID data and per standard portion, from bran and beans to fruit.
10 October 2026 · 6 min read
How much caffeine is too much in a day.
UK guidance puts the limit at 400mg of caffeine a day for most adults, 200mg in pregnancy. What that means in mugs of tea and coffee, and how to cut down.
10 October 2026 · 6 min read
How much exercise you need each week.
The NHS and UK Chief Medical Officers say 150 minutes of moderate or 75 of vigorous activity a week, plus strength on 2 days. What counts and how to fit it in.
10 October 2026 · 6 min readHow much fibre you need a day, and what most of us eat.
UK adults are advised to eat 30g of fibre a day. The average adult eats 16.4g. The official figures, children's targets and simple ways to reach 30g.
10 October 2026 · 6 min read
How much magnesium you need each day.
The NHS says men need 300mg of magnesium a day and women 270mg. UK figures for every age, the 400mg supplement line and how to add up your products.
10 October 2026 · 6 min read
How much selenium you need each day.
The NHS says men need 75µg of selenium a day and women 60µg. UK figures for every age, the 350µg supplement line and how to add up your products.
10 October 2026 · 6 min read
How much sleep adults really need.
The NHS says adults need 7 to 9 hours of sleep on average. How to tell if you get enough, the NHS sleep tips, and why a regular routine matters.
10 October 2026 · 6 min read
How much sunlight you need for vitamin D.
NHS and NICE guidance on how much sunlight you need for vitamin D in the UK, the best time of day, skin tone, burning, and why winter sun is not enough.
10 October 2026 · 7 min readHow much vitamin C you need each day.
Adults aged 19 to 64 need 40mg of vitamin C a day, says the NHS. Why labels use 80mg, whether food covers it, and the NHS limit on taking too much.
10 October 2026 · 5 min read
How much water to drink in a day.
The NHS Eatwell Guide says 6 to 8 cups or glasses of fluid a day. What counts, including tea and coffee, how to check, and when you need more.
10 October 2026 · 6 min readHow much zinc you need each day.
The NHS says men need about 9.5mg of zinc a day and women 7mg. UK figures for every age, the 25mg supplement line and how to add up your products.
10 October 2026 · 6 min read
How to breathe when you run in cold air.
How to breathe when running in cold air: nose breathing at easy pace, a buff over your mouth, a proper warm-up, and what cold air does to your lungs.
10 October 2026 · 7 min read
How to build a habit that actually sticks.
How to build a habit, from UCL research: pick one action, tie it to a daily cue and repeat it. It took 18 to 254 days in the study, about 66 on average.
10 October 2026 · 6 min read
How to choose a multivitamin: a five-point check.
There is no single best multivitamin in the UK. A five-point check: amounts and % NRV, vitamin D, format, allergens and price per serving.
10 October 2026 · 7 min read
How to get a London Marathon place.
How to qualify for the 2027 London Marathon: Good for Age and championship times, charity and club places, and which entry routes are still open.
10 October 2026 · 6 min readHow to mix vitamin powder without the lumps.
How to take vitamin powder: measure one level scoop, add it to cold water, shake or stir, drink. Plus how to mix powder without lumps, and smoothies.
10 October 2026 · 5 min readHow to read a supplement label.
How to read a UK supplement label: the name, daily dose, warnings, % NRV, allergens and best before date, and why it differs from a US Supplement Facts panel.
10 October 2026 · 7 min read
Getting up when it is still dark outside.
Practical ways to wake up on dark UK winter mornings: light, a steady routine, alarms that help and the NHS's sleep advice, with calculated sunrise times.
10 October 2026 · 6 min read
How much water runners should drink.
How much water runners need: daily fluid, drinking to thirst, working out your sweat rate, salt and electrolytes, and hydration for a half marathon.
10 October 2026 · 8 min read
Immufix winter discount code, checked and working.
The Immufix winter discount code is TRYIMMUFIX: 20% off your first order, one-off or subscription. Checked prices, how to use it and the terms.
10 October 2026 · 5 min read
Where UK iodine comes from, milk and fish first.
The best iodine foods in the UK, from white fish to milk and eggs, with per-100g figures from government data and the NHS daily amount for adults.
10 October 2026 · 6 min read
Is a multivitamin worth it? An honest answer.
Is a multivitamin worth it? What the NHS says about food first, the vitamin D advice for everyone in the UK, and who might consider a supplement.
10 October 2026 · 7 min read
Is vitamin D added to milk in the UK?
UK cows' milk is generally not fortified with vitamin D and has only a trace, NHS and government data show. Which milks and plant drinks have it added.
10 October 2026 · 6 min read
Your London Marathon 2027 training and diet plan.
The 2027 London Marathon is on 24 and 25 April. A month-by-month training and nutrition timeline to race day, with official plans and sourced carb targets.
10 October 2026 · 7 min read
The lunchtime walk, and the daylight that comes with it.
The benefits of a lunchtime walk, from NHS and UK guidance: how long and how fast, why winter daylight matters, and calculated UK sunrise and sunset times.
10 October 2026 · 7 min read
Magnesium-rich foods, and how to eat more of them.
The foods richest in magnesium, with per-100g figures from UK government data, the NHS daily amounts for men and women, and easy swaps that add more.
10 October 2026 · 5 min read
The marathon taper, week by week.
A marathon taper cuts training volume by 41 to 60% over 2 to 3 weeks while keeping some pace. What to do the week before a marathon: runs, sleep and food.
10 October 2026 · 6 min read
A healthy morning routine, one small step at a time.
Simple morning routine ideas from NHS and UK guidance: a steady wake-up time, water, daylight, movement and breakfast, linked so the routine runs itself.
10 October 2026 · 6 min read
A new year routine that lasts past January.
How to build a new year routine that lasts past January: small goals tied to a daily cue, what UK guidelines suggest, and how long a habit really takes.
10 October 2026 · 7 min read
Niacin, vitamin B3 explained.
What niacin (vitamin B3) is, the UK foods highest in it per 100g, how much adults need a day and what the NHS says about niacin supplements.
10 October 2026 · 6 min read
The nutrients behind normal muscle function.
Which nutrients hold the UK claim for normal muscle function, what magnesium and vitamin D do for muscles, and the foods that supply them.
10 October 2026 · 7 min read
Pantothenic acid, vitamin B5 explained.
What pantothenic acid (vitamin B5) is, the UK foods highest in it per 100g, why no daily amount is set in the UK and what the NHS says about supplements.
10 October 2026 · 5 min readYour first parkrun, step by step.
Is parkrun free? Yes. How to register and get your barcode, the age categories in your results, why there is no time limit, junior parkrun and volunteering.
10 October 2026 · 7 min readparkrun in winter, every Saturday.
Yes, parkrun runs every Saturday through winter. Start times, how cancellations are announced, rain, Christmas Day and New Year's Day events, and what to wear.
10 October 2026 · 8 min read
Paula Radcliffe's career, year by year.
A sourced timeline of Paula Radcliffe's titles, medals, records and honours, from the 1992 world junior cross country title to her 2026 OBE.
10 October 2026 · 6 min readHow Paula Radcliffe ate and trained.
What Paula Radcliffe has said she eats, how she trained for the marathon, and the daily scoop she has taken every morning since 1998.
10 October 2026 · 5 min read
Paula Radcliffe's three London wins.
Paula Radcliffe won the London Marathon three times, in 2002, 2003 and 2005. Each date and winning time, what each win meant, and her course record.
10 October 2026 · 5 min read
Paula Radcliffe and the world record.
No. Paula Radcliffe's 2:15:25 from London 2003 stood for 16 years. What happened to the record, and the records she still holds today.
10 October 2026 · 5 min readPaula Radcliffe's three New York wins.
Paula Radcliffe won the New York City Marathon three times, in 2004, 2007 and 2008. The dates, winning times and the story of each race.
10 October 2026 · 6 min readPaula Radcliffe's training, scaled down.
What Paula Radcliffe's marathon training plan looked like, what is public about her training log, and seven lessons ordinary runners can use.
10 October 2026 · 6 min read
Porridge before running, done right.
Is porridge good before running? How long before a run to eat it, how much to have, water or milk, and the toppings that work, with carbohydrate figures.
10 October 2026 · 6 min read
Riboflavin, vitamin B2 explained.
What riboflavin (vitamin B2) is, the UK foods highest in it per 100g, how much adults need a day and why the NHS says to keep those foods out of sunlight.
10 October 2026 · 5 min read
What to wear running in the cold.
What to wear running in a UK winter, layer by layer: what to put on above 10°C, at 5 to 10°C, 0 to 5°C and below freezing, and how wind and rain change it.
10 October 2026 · 8 min read
Running in the dark, safely.
How to run in the dark safely in the UK: what the Highway Code says, the best lights for seeing and being seen, choosing a route, and personal safety advice.
10 October 2026 · 7 min read
Running in the rain, done well.
Running in the rain tips: what to wear, which shoes, how to stop chafing, staying safe on wet roads and in lightning, and whether parkrun goes ahead.
10 October 2026 · 7 min read
Fruit and veg in season in a UK winter.
What fruit and veg is in season in a UK winter, month by month from December to February, which of it is grown here, what it contains and simple ways to eat it.
10 October 2026 · 6 min read
Where to find selenium, from Brazil nuts to fish.
Which foods are high in selenium, with per-100g figures from UK government data, how much is in Brazil nuts, and simple ways to get more in your diet.
10 October 2026 · 6 min read
The shortest day of 2026 is Monday 21 December.
The shortest day of 2026 in the UK is Monday 21 December, with the winter solstice at 8.50pm GMT. Sunrise, sunset and daylight for 12 UK cities.
10 October 2026 · 6 min readSoya isoflavones, food by food.
Soya isoflavones are plant compounds found mainly in soya beans. What they are, which soy foods contain the most, and the 45mg in a scoop of Immufix.
10 October 2026 · 5 min read
Keeping a routine over Christmas.
A healthy Christmas routine without the guilt: how to stay active over Christmas, keep sleep steady, eat well across the week and keep count of alcohol units.
10 October 2026 · 6 min readStrength training for runners, at home.
Strength training for runners: the NHS says 2 days a week, studies use 2 to 3. A simple home routine of squats, lunges, step-ups, calf raises and planks.
10 October 2026 · 6 min read
How much sugar a day, and what the label means.
The NHS says adults should have no more than 30g of free sugars a day. What "of which sugars" means on a label, and the 9.9g in Immufix in context.
10 October 2026 · 7 min read
How much light a UK winter really gives you.
Daylight in a UK winter, city by city and month by month, and how much of it is actual sunshine. London gets 7h 50m on 21 December, Edinburgh 6h 58m.
10 October 2026 · 6 min read
Vegan and vegetarian multivitamins: what to check first.
Choosing a vegan or vegetarian multivitamin in the UK: the vitamin D source, B12, iodine, what a vegan label means in law, and allergens.
10 October 2026 · 6 min readVitamin A in food, and where to stop.
Vitamin A foods in the UK per 100g, the NHS daily amounts of 700µg for men and 600µg for women, and the NHS 1.5mg limit and liver advice.
10 October 2026 · 6 min read
Vitamin B6 foods, and what it does.
The UK foods highest in vitamin B6 per 100g, what vitamin B6 does, how much adults need a day and the NHS 10mg limit for supplements.
10 October 2026 · 6 min read
Vitamin C and iron, on the same plate.
Which vitamin C foods to pair with iron-rich foods, how vitamin C and iron work together, and what tea and coffee do, with UK government food data.
10 October 2026 · 7 min read
The highest vitamin C foods, by the numbers.
The UK foods highest in vitamin C, with per-100g figures from the government's food composition data, how cooking changes them and how much you need.
10 October 2026 · 5 min read
Vitamin D foods in the UK, by the numbers.
The UK foods with the most vitamin D per 100g, from the government's food composition data, and why food alone rarely reaches the NHS 10 micrograms in winter.
10 October 2026 · 7 min read
How much vitamin D is too much.
The NHS says adults should not take more than 100 micrograms (4,000 IU) of vitamin D a day. The limits by age, how to convert IU, and how to add up products.
10 October 2026 · 6 min read
Vitamin D in a UK winter, explained.
Why the NHS advises everyone in the UK to consider 10 micrograms of vitamin D a day in autumn and winter, who should take it all year, and the food sources.
10 October 2026 · 4 min read
Vitamin E, from the oil bottle up.
The UK foods highest in vitamin E per 100g, from plant oils to nuts and seeds, the NHS daily amounts of 4mg and 3mg, and what vitamin E does.
10 October 2026 · 5 min readPowder or tablets: what actually differs.
Are powdered vitamins better than pills? The factual differences in dose size, swallowing, taste, routine, ingredients and price per serving.
10 October 2026 · 6 min readWhat vitamins really do for your energy.
Which vitamins and minerals hold the UK's authorised energy claims, what "normal energy-yielding metabolism" means, and the everyday foods that supply them.
10 October 2026 · 6 min read
Vitamins after 50: what the NHS advises.
Which vitamins do over 50s need in the UK? What NHS and government advice says: food first, vitamin D, the upper limits, and when to ask a GP.
10 October 2026 · 7 min read
Vitamins for runners, food first.
Which vitamins and minerals runners need, why food comes first, the NHS vitamin D advice for autumn and winter, iron, calcium and the authorised claims.
10 October 2026 · 6 min readWhat NRV means on a label.
NRV means nutrient reference value, the daily amount used on UK food labels. How % NRV is worked out, why 15% matters, and how NRV differs from RNI.
10 October 2026 · 6 min read
What a food supplement is in UK law.
The UK legal definition of a food supplement, what "dose form" means, why a supplement is a food and not a medicine, and who enforces the rules.
10 October 2026 · 7 min readWhat an authorised health claim is.
Food supplement claims in the UK: what an authorised health claim is, the GB register, why the word "normal" matters, the 15% NRV rule and what is banned.
10 October 2026 · 7 min readConjugated linoleic acid, in plain terms.
CLA, or conjugated linoleic acid, is a group of fatty acids found mainly in milk, cheese, butter, beef and lamb. What it is, and the 365mg in Immufix.
10 October 2026 · 6 min read
What FOS is, and where it is found.
What FOS (fructo-oligosaccharides) is, whether it is a prebiotic, which foods contain it naturally and how it differs from inulin, with sources.
10 October 2026 · 6 min readWhat L-glutamine is, and where it comes from.
Yes, L-glutamine is an amino acid and a building block of protein. What it does in the body, which foods contain it, and the 1g in Immufix.
10 October 2026 · 6 min readTaurine, without the myths.
Is taurine bad for you, does it come from bulls, does it contain caffeine? What EFSA found, how taurine is made, and the 500mg in Immufix.
10 October 2026 · 6 min read
What to eat after a run.
What to eat after a run: carbohydrate plus 15 to 25g of protein, how soon to eat it, what to drink, and simple UK meals and snacks that do the job.
10 October 2026 · 7 min readWhat to eat before a morning run.
How long before a morning run to eat, what to eat with 30 minutes or 2 hours to spare, when running on empty is fine, and Paula Radcliffe's race breakfast.
10 October 2026 · 6 min readB vitamins and tiredness, one by one.
Which B vitamins hold the authorised UK claim for the reduction of tiredness and fatigue, which only cover energy metabolism, and the foods that supply them.
10 October 2026 · 6 min readThe vitamins and minerals behind a normal immune system.
The vitamins and minerals that contribute to the normal function of the immune system under UK rules, the amounts in Immufix and NHS food sources.
10 October 2026 · 7 min read
Why winter makes you so tired.
Feeling more tired in a UK winter is common. Why the dark months change your day, the NHS's practical tips for tiredness, and where nutrition fits.
10 October 2026 · 4 min read
Why the winter sun is too low for vitamin D.
Yes. The UK's midday sun reaches 15 degrees in London and 11 in Edinburgh in December, against about 60 in June. Why that low angle stops vitamin D.
10 October 2026 · 6 min read
Winter running kit, in the right order.
Winter running essentials for the UK in priority order: shoes, being seen, layers, gloves and hat, a shell and tights, and what to buy first on a budget.
10 October 2026 · 7 min readRunning through a UK winter, properly.
How to keep running through a UK winter: being seen in the dark, what to wear, warming up, running on frost and ice, and keeping the routine going until spring.
10 October 2026 · 5 min read
Winter walks, planned around the light.
Winter walks in the UK: when the daylight runs out in each city, what to wear and carry, and the safety basics for roads, dark paths and higher ground.
10 October 2026 · 6 min read
Where to find zinc in everyday food.
Which foods have the most zinc, with per-100g figures from UK government data, the NHS daily amounts for men and women, and simple ways to eat more.
10 October 2026 · 5 min readThe Immufix story
Brian Welsby set out to build a formula people could trust for decades, not a supplement for a season. How Breakthrough became Immufix.
1 August 2026 · 4 min readPaula’s Run Club: why Paula chooses Immufix
Paula Radcliffe on her career, the setbacks, and her morning routine.
29 July 2026 · 1 min readSupporting your immune system every day
Why nutrition, lifestyle and consistency matter more than any single ingredient, and where supplements genuinely help.
29 July 2026 · 5 min readImmufix Featured in Active Magazine
We’re delighted to see the story behind Immufix featured in the Summer 2026 edition of Active Magazine.
22 July 2026 · 1 min readImmufix Featured in the Rutland & Stamford Mercury
We’re delighted that the story behind the new ownership of Immufix has been featured in the Rutland & Stamford Mercury.
19 July 2026 · 1 min readInterview with Phillippa Spilsbury
Interview with owner and long-time user Phillippa Spilsbury
17 July 2026 · 3 min watch