6 Best Probiotics, Compared Head-to-Head

€34.99 · 60 capsules (30-day supply) · 2 capsules/day · 10 billion CFU/day

Glow25 Balance is built around a 3-in-1 tribiotic formula: active and inactivated lactic acid bacteria cultures, combined with inulin from chicory root and golden kiwi extract as two separate prebiotic sources. Rather than chasing the highest possible strain count, it uses five carefully selected strains in both active and inactivated form — the idea being that each works through a different mechanism and the two complement each other.

Why calcium and vitamin B2 — not just "more vitamins"? Several competitors in this comparison bulk out their formula with a long list of generic vitamins (vitamin C, zinc, iron, folic acid), most tied to immunity or tiredness claims. Balance takes the opposite approach: just two nutrients, both directly relevant to what the product is for. Vitamin B2 (riboflavin) contributes to the maintenance of normal skin and helps protect cells from oxidative stress — relevant because Balance sits within a beauty-focused routine, not just a generic gut product. Calcium contributes to the normal function of digestive enzymes — a benefit tied directly to digestion, rather than an unrelated function bolted on for the label.

Golden kiwi extract: the one ingredient none of the other six products use. The kiwi fruit powder in Balance is made from the whole fruit — skin, flesh and seeds — so it's more than just a fibre source. It naturally contains vitamin C and the plant enzyme actinidin, which is being studied in relation to protein digestion. A controlled study using kiwi extract capsules found an increase in Faecalibacterium prausnitzii, one of the most important "good" bacterial strains in the gut, in people with sluggish digestion.^{[Blatchford et al., 2017]} None of the six competitor products in this comparison use golden kiwi extract — they rely solely on inulin, PHGG, or sugar beet fibre as their prebiotic source.

What is an HPMC capsule? Balance's capsule shell is made from hydroxypropyl methylcellulose (HPMC) — a plant-based coating agent derived from cellulose. Unlike traditional gelatine capsules (made from animal collagen), HPMC is vegan, tasteless, and well tolerated. For context: The Swallow Co, ARTAH, and Garden of Life's Microbiome Once Daily also use HPMC capsules — it's become a common quality standard across this category, not a Balance-only advantage.

The ecosystem advantage: Balance is the only product in this comparison built specifically to complement a collagen routine. A balanced gut supports better nutrient absorption — including, potentially, how well collagen from a powder or capsule can be used by the body.^{[Wastyk et al., 2021]} If you already take collagen, that's a genuine, coordinated combination rather than two unrelated products.

Backed by science: every core ingredient in Balance — the lactic acid bacteria cultures, the inulin, and the kiwi extract — is grounded in published research rather than marketing claims alone. You'll find the full source list and study summaries further down, in "What the science actually says."

Strengths: the broadest formulation approach in this comparison (pre + pro + postbiotics + 2 targeted micronutrients in one product), the only dual-prebiotic source (inulin + golden kiwi), the only product designed as part of a wider skincare/collagen routine, made in Germany, 60-day money-back guarantee.
Trade-off: at ≈€1.17/day it isn't the cheapest option here, and at 10 billion CFU it sits below ARTAH (50bn) and PuroLabs (21bn) — reflecting a focus on strain selection over raw quantity.

£30 (subscribed) / £35 (one-off) · 30 capsules · 1 capsule/day · 35 billion CFU/day

Probiotic Live Cultures packs 15 bacterial and yeast strains (including patented Lactospore® Bacillus coagulans and Saccharomyces boulardii) into a gastro-resistant, delayed-release capsule, with chicory inulin included as a prebiotic. The CFU count is guaranteed at end of shelf life rather than at manufacture — a genuinely useful transparency point most brands don't disclose.

Strengths: a long-standing, research-backed strain list, CFU guaranteed to end of shelf life, a full 6-month money-back guarantee, made in the UK.
Trade-off: no added micronutrients or skin-specific ingredients — this is a straightforward, gut-only formula.

£38.25 (subscribed) / £45 (one-off) · 30 capsules · 1 capsule/day at bedtime · 50 billion CFU/day

Biome Restore is positioned as intensive, short-term support rather than daily maintenance: 5 bacterial strains at a high 50 billion CFU dose, plus lion's mane (for the gut-brain axis), ginger and boswellia for digestive comfort, and green tea extract for polyphenols. ARTAH backs it with a 90-day "Feel-Good Guarantee."

Strengths: the highest CFU count in this comparison, a herbal-support angle beyond bacteria alone, a long 90-day guarantee.
Trade-off: at ≈£1.50/day, the most expensive option here; only 5 bacterial strains versus 13–15 in several competitors.

£54.90 · 60 capsules (60-day supply, or a 30-capsule size) · 1 capsule/day with food · 5 billion CFU/day

Skin Clear Biome is explicitly framed around the gut-skin axis: 4 bacterial and yeast strains combined with zinc, which contributes to the maintenance of normal skin. The capsules are packed in nitrogen-flushed aluminium pods rather than a standard bottle, aimed at preserving strain viability.

Strengths: a skin-first positioning with a UK skin-microbiome patent claim, careful packaging for strain preservation.
Trade-off: the lowest CFU count in this comparison (5 billion), and no prebiotic fibre included in the formula.

£28.80 (subscribed) / £36 (one-off) · powder, 30 servings · 6g/day · no live bacteria

This is the one worth reading carefully before you buy expecting a classic probiotic. True Biome deliberately contains no live probiotic bacteria — Ancient + Brave's own FAQ confirms this. Instead, it combines PHGG (a soluble prebiotic fibre), L-glutamine (an amino acid that fuels gut-lining cells), and a heat-treated postbiotic strain (Lactobacillus plantarum L-137 HK) that no longer contains living organisms. It's a legitimate gut-support product — just not a "probiotic" in the conventional sense, and worth knowing if that's specifically what you searched for.

Strengths: shelf-stable with no refrigeration needed, a gentle option for people wary of live-bacteria supplements, pairs easily into hot or cold drinks.
Trade-off: if you're specifically looking for live probiotic bacteria, this product simply isn't that — by its own admission.

≈£29.99–£30.99 (comparable UK retail price) · 30 capsules · 1 capsule/day · 10 billion CFU/day

An entry-level, no-frills formula: 13 live bacterial strains delivering 10 billion CFU, formulated to withstand stomach acid and bile, free from gluten, dairy and soya. Garden of Life also sells higher-CFU "Ultra," "Men's," and "Women's" versions with more strains — this is the base once-daily option.

Strengths: a recognisable, long-established supplement brand, whole-food formulation philosophy, straightforward once-daily dosing.
Trade-off: no prebiotic fibre or additional micronutrients included in this entry-level version.

£34.99 · 30 capsules · 1 capsule/day · 21 billion CFU/day

Biotic Complex combines 15 bacterial strains with sugar beet as a natural prebiotic fibre (chosen deliberately instead of inulin), in a delayed-release capsule designed to survive stomach acid. It's backed by a 60-day money-back guarantee and made in the UK.

Strengths: a strong strain count and CFU dose for the price, delayed-release delivery, a UK-made, family-run brand.
Trade-off: no added micronutrients or skin-specific ingredients — a gut-only formula, like The Swallow Co's.