Written and medically reviewed by Dr Zeeshan Afzal (MBBS) — Medical Doctor & Medical Content Lead, Welzo
Evidence-based · Honest about what's proven and what isn't · UK-focused
Last updated: July 2026 · Reading time: ~9 minutes
Both of these contain something most probiotic supplements don't bother with: a properly named, genuinely researched strain. They also contain something most supplements don't — sugar. Our digestive health guides cover how strains differ, and the probiotics range and wider gut health supplements are there if you want the bacteria without the drink.
Table of contents
It's easy to be sniffy about supermarket probiotic drinks. On one measure that actually matters, they beat a large share of the supplement aisle.
Yakult contains Lacticaseibacillus casei Shirota — a specific, named, catalogued strain that has been studied for decades and is the same organism the company has built around since the 1930s.
Actimel contains Lacticaseibacillus casei DN-114 001, likewise a defined strain with published research behind it.
They're also cheap, pleasant, and require no willpower — which is not nothing, given that most probiotic courses fail at the taking rather than the choosing.
This is the part worth understanding, and it's checkable on any pack.
Probiotics carry no authorised health claim in Great Britain or the EU. No product may legally state that its bacteria support immunity, digestion or anything else, because no probiotic claim has been approved.
So when a drink carries a permitted claim about immune function, that claim derives from added vitamins — typically vitamin B6 and vitamin D, both of which do hold authorised claims for normal immune system function. The vitamins are doing the regulatory work, not the bacteria.
That isn't deceptive — it's what the law permits. But it does mean the immune messaging on the front of the bottle is, strictly speaking, a vitamin claim. You could get the same authorised benefit from a vitamin D tablet without the sugar.
Here is the honest trade-off, and it's the reason these aren't simply cheaper supplements.
Both are fermented dairy drinks with added sugar. The amount varies by product and by market — original versus reduced-sugar versions differ substantially — so check the pack you're actually buying rather than trusting a figure quoted online.
The important thing isn't one bottle. It's that these are marketed for daily consumption, often to whole families, which turns a small amount into a habitual one. A capsule delivers bacteria with no sugar at all.
If you're managing blood glucose, watching children's sugar intake, or simply trying to cut back, that's the material difference between a drink and a supplement — not the microbiology. See sweeteners and gut health.
These drinks deliver a smaller number of organisms than most supplements, in a dairy base, and need refrigeration.
Lower isn't automatically worse — in the best dose-ranging trial in this field, a strain improved IBS symptoms at one dose and failed to beat placebo at a dose a hundred times higher. But it does mean you can't assume a daily drink substitutes for a product dosed at trial levels for a specific purpose. See CFU vs AFU.
| Feature | Yakult / Actimel | Probiotic supplement |
|---|---|---|
| Named strain | Yes — genuinely | Varies; many list species only |
| Added sugar | Yes — check the pack | None |
| Dairy | Yes | Dairy-free options widely available |
| Refrigeration | Required | Usually not |
| Strain choice | One, fixed | Choose to match your goal |
| Front-of-pack claims | Derive from added vitamins | No authorised claims either |
| Adherence | Easy — it's a treat | Requires remembering |
This is where most of these drinks are actually consumed, so it deserves its own section.
HealthAid KidzProbio Chewable — £14.54 · 98 reviews · Available from Welzo. A chewable format designed for children, delivering the bacteria without the sugar load of a daily sweetened drink. If the reason you're buying Yakult or Actimel is "something good for the kids' tummies", this does that job more directly.
BioRay Kids NDF Tummy — £34.35 (from £39.99) · 110 reviews · Available from Welzo. A liquid option for children who won't take capsules — useful if the appeal of a drink was the format rather than the flavour.
Always check age suitability on the specific product, and speak to your GP or health visitor before giving a supplement to a child. More in children's probiotics.
Lamberts Acidophilus Extra 10 — £21.99 · 82 reviews · Available from Welzo. Sixty capsules of lactic acid bacteria from a long-established UK manufacturer, with no sugar and no dairy drink attached. If you've been drinking a daily probiotic shot largely out of habit, this delivers the bacterial side of that habit without the rest of it.
Both drinks are well tolerated by most people. Mild bloating or wind when starting any probiotic is common and usually settles — see probiotic side effects.
Take care, or seek advice first, if you
Lactose intolerance is usually not a barrier, as fermentation reduces lactose — but a milk protein allergy is a different matter entirely. More in probiotics safety.
On labelling: probiotics carry no authorised health claim in GB or the EU. Supplements are sold as food supplements and cannot legally be marketed as treating any condition.
See your GP — or seek urgent care — if you have:
A daily probiotic drink is not a substitute for assessment. See when to see a GP and bowel cancer screening.
Yes. It contains Lacticaseibacillus casei Shirota, a specific named strain studied for decades — better strain identification than many capsules provide. The trade-offs are a lower dose, added sugar, and no choice of strain.
Any permitted immune claim on the pack derives from added vitamins such as B6 and vitamin D, which hold authorised claims — not from the bacteria, which cannot carry an authorised claim in GB or the EU.
It varies by product and market, and reduced-sugar versions differ substantially from the originals. Check the specific pack. The issue isn't one bottle — it's that they're designed for daily use.
Better labelled than many, and easier to stick with. Worse on dose, sugar, dairy and the ability to choose a strain matched to your goal.
Usually yes — fermentation reduces the lactose and most people tolerate them. A cow's milk protein allergy is different and means avoiding both.
They're widely consumed by children, but the daily sugar contribution is the thing to weigh. A chewable children's probiotic delivers the bacteria without it.
A supplement with a strain trialled for antibiotic-associated diarrhoea is the better choice — and take it a few hours apart from the antibiotic.
The bacteria are the same; you're avoiding the sugar, which is the main drawback. Sweeteners have their own debate, but for most people the lighter version is the better daily option.
Some proportion does — these strains were selected partly for robustness, and arriving with food gives some buffering. The bigger limitation is dose, not survival.
A basic lactic acid bacteria capsule. Lamberts Acidophilus Extra 10 at £21.99 covers sixty days without sugar or dairy.
Medical disclaimer: This article is for general information and education only and does not constitute medical advice, diagnosis or treatment. Welzo does not sell Yakult or Actimel. Food supplements are not a substitute for a varied and balanced diet, and are not intended to diagnose, treat, cure or prevent any disease. Probiotics carry no authorised health claim in GB or the EU; permitted claims on fermented dairy drinks derive from added vitamins rather than from the bacteria. Sugar content varies by product and market — always check the pack, particularly if you are managing blood glucose or buying for children. These products are dairy-based and unsuitable for anyone with a cow's milk protein allergy. Live cultures should be discussed with a doctor if you are immunocompromised, have an indwelling venous line, or have inflammatory bowel disease. Persistent digestive symptoms, or a change in bowel habit lasting three weeks or more, require medical assessment. Prices, review counts and availability are correct at the time of writing.
About the author
Dr Zeeshan Afzal (MBBS) is a practising medical doctor and Welzo's Medical Content Lead. He writes and reviews Welzo's health content to ensure it is accurate, evidence-based and aligned with current UK clinical guidance.
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