Probiotics CFU Guide for Brands: Count, Overage, Stability

A label claim of 10 billion CFU at end of shelf life is not the same as 10 billion at production. Probiotic counts decline over time, and the rate depends on strain, moisture, temperature and packaging. Most brands add an overage of 20–50% above the label claim. A 10 billion CFU claim may therefore be produced at 12–15 billion CFU. Overage is not a hidden cost: it is the only way to guarantee the label number on day 730.

Shelf life for dry probiotic capsules and stick packs typically runs 18–24 months when water activity stays below 0.2 and packaging uses aluminium foil or HDPE with a desiccant. Blister packs offer better moisture barrier than bottles for humid markets. If you sell into the Middle East or Southeast Asia, request stability data at 30°C/65% RH and 40°C/75% RH before committing to a 24-month claim.

Not all strains survive the same process. Lactobacillus and Bifidobacterium species differ in heat tolerance, acid resistance and oxygen sensitivity. For capsules, a 50:50 blend of Lactobacillus rhamnosus and Bifidobacterium lactis is common because both have reasonable stability in dry form. Spore-forming Bacillus coagulans can survive higher temperatures and does not require refrigeration, which simplifies shipping. Your strain list should match the health claim you intend to make in your market.

Excipients matter. Microcrystalline cellulose and maltodextrin are standard carriers. Magnesium stearate slows flow but can reduce viability in some formulations. For stick packs, a blend of inulin or FOS with the probiotic powder improves mouthfeel and can support the strain. EUPHM runs small trial batches to check CFU loss after blending, encapsulation and 30 days of accelerated storage before a full run is scheduled.

Every probiotic lot should be tested for total CFU, strain identity, moisture content and absence of pathogens. Standard methods include plate counts on MRS agar for Lactobacillus and TOS agar for Bifidobacterium. Strain identity can be confirmed by PCR or 16S sequencing. A certificate of analysis should state the test method, the result and the acceptance limit. Without this, a retail buyer or importer has no way to verify the label claim.

Documentation for export includes a certificate of analysis, certificate of origin, halal certificate where relevant, and a stability report. For organic claims, the probiotic strain and all excipients must be listed on the organic certificate. EU and UK importers may request a statement on novel food status for certain strains. Plan 5–10 working days for document review before shipment booking.

Every probiotic lot is tested at three points: incoming raw material, bulk blend before encapsulation, and finished packaged goods. Identity testing uses 16S rRNA sequencing or strain-specific PCR to confirm the species and, where claimed, the strain. Potency is measured by plate count on appropriate media under anaerobic conditions, with results expressed in CFU per gram or per capsule. Microbial safety covers total aerobic count, yeast and mould, E. coli, Salmonella, and Staphylococcus aureus. Heavy metals (lead, arsenic, cadmium, mercury) are tested by ICP-MS against USP <232> or EU limits. Disintegration testing follows USP <701> for capsules and <2040> for delayed-release formats.

The certificate of analysis (COA) issued with each lot lists the product name, lot number, manufacturing date, expiry date, and the specification range for each test. It includes the actual result, the test method reference, and a pass/fail statement. For potency, the COA states the label claim at the time of manufacture and the overage applied. Water activity is reported because it predicts stability: keep below 0.20 for dry probiotic powders. Retained samples of every lot are stored at the factory for the shelf-life period plus six months, under the same conditions as the stability protocol, so any post-market query can be investigated.

The stability protocol typically uses accelerated conditions at 30°C/65% RH and 40°C/75% RH for three and six months, alongside real-time storage at 25°C/60% RH for the declared shelf life. For refrigerated products, real-time data at 2–8°C is required. Testing intervals are 0, 1, 3, 6, 12, 18, and 24 months. The protocol must account for the packaging format: a bottle with a desiccant canister performs differently from a blister or stick pack. We provide the stability summary report for your dossier, and the raw data is available under confidentiality agreement.

Probiotic formats include HDPE bottles with induction seals and desiccant canisters, blister packs (PVC/PVDC or alu-alu for moisture barrier), stick packs, and sachets. Bottle sizes range from 30 to 120 capsules. Blister cards typically hold 10, 14, or 21 capsules. Stick packs are 2–5 g. For each format, we confirm the fill weight, capsule count, and headspace. Desiccant selection depends on the target water activity and the intended shelf life; silica gel canisters are common, but molecular sieve sachets are used for high-humidity markets. We provide packaging specifications with tolerances for dimensions, seal strength, and moisture transmission rate.

For the US market, the dietary supplement label must include the statement of identity, net quantity of contents, supplement facts panel, ingredient list, and the name and place of business of the manufacturer, packer, or distributor. The supplement facts panel lists the probiotic blend with the CFU count at the end of shelf life, not at manufacture. Allergen declarations are required for major allergens. Structure/function claims must carry the DSHEA disclaimer. For the EU, Regulation (EU) No 1169/2011 applies, and probiotic claims are restricted under Regulation (EC) No 1924/2006; only authorised claims may be used. We review your artwork against these requirements before printing.

Lot coding and expiry dating are applied by inkjet or laser on the bottle, blister foil, or stick pack. The format is typically LYYDDD (year and Julian day) or a sequential lot number, plus the best-before date. We retain the coding records for traceability. Cartons are specified with dimensions, board grade, and gross weight. Standard export cartons hold 12, 24, or 48 retail units. Palletisation follows the customer's requirement: 1200×1000 mm or 1200×800 mm pallets, with a maximum height of 1.8 m and stretch-wrap plus corner boards. For Amazon FNSKU labelling, we can apply the FNSKU barcode over the retail barcode or print it directly on the carton, and we can poly-bag units if required by the marketplace.

Sampling starts with a brief: strain list, CFU target, capsule format, and packaging. We provide a quotation within two working days and a sample within 7–10 working days after receipt of sample materials. Sample costs are credited against the first mass-production order. For a new formulation, a pilot batch of 1,000 units is typical to validate potency and stability before scaling. The mass-production window is 20–35 working days after purchase order and deposit, depending on capsule availability and whether custom packaging is used. Delays occur if strain documentation or artwork approval is outstanding, so we set a artwork freeze date at order confirmation.

Shipping options are air freight and sea freight. Air freight from Guangdong to the US or EU takes 5–8 days door to door, with costs typically 4–8 times sea freight per kilogram. Sea freight to the US West Coast takes 18–25 days port to port, and to Europe 28–35 days. Probiotic products are not generally classified as dangerous goods, but some carriers require a MSDS and a non-hazardous declaration. We provide the MSDS, COA, free-sale certificate, and, where applicable, a phytosanitary certificate for plant-derived capsule shells. For customs, we include the commercial invoice, packing list, and certificate of origin.

Incoterms offered are EXW, FOB Shenzhen or Hong Kong, and DDP for select markets. FOB is the most common for first orders because it gives the buyer control over freight and insurance. DDP is available for the US, UK, and EU, where we handle import clearance and duties, but the buyer must provide an EORI or importer of record. We recommend confirming the destination port and whether the consignee has a customs bond before booking. For repeat orders, we can hold stock of your packaging components to shorten the lead time by 5–7 days, subject to a stock-holding agreement.