A starter culture is a carefully selected blend of live bacteria that ferments milk into yogurt or kefir. When you add our sachet to warm milk, the bacteria wake up, consume the milk's natural sugars, and produce lactic acid — which thickens the milk, creates that characteristic tangy flavour, and fills it with billions of live probiotic cultures.

Think of it like a sourdough starter, but for dairy. Each Pambiotic sachet contains over 25 billion live CFU (colony forming units) per gram — the bacteria that do all the work.

Both are live probiotic starter cultures — but they produce very different results:

• Yogurt Starter — uses Lactobacillus bulgaricus & Streptococcus thermophilus. Ferments at 43–45°C for 7–8 hours. Produces thick, creamy, spoonable yogurt.
• Kefir Starter — uses a multi-strain culture including Lactococcus lactis subspecies and kefir grains. Ferments at 35–40°C for 12–14 hours. Produces a lighter, thinner, slightly effervescent drinkable kefir. No yogurt maker needed.

Each box contains 10 individually sealed 1g sachets. One sachet ferments one litre (33.8 fl oz) of milk. So one box makes up to 10 litres of fresh, live yogurt or kefir.

For reference: a standard family of four typically gets through one box in 4–6 weeks, depending on consumption habits. This is why our most popular subscription plan is every 4 weeks.

Our starter cultures are vegetarian-friendly — they contain only live bacterial cultures with no animal-derived ingredients in the sachet itself.

For vegans: the cultures themselves are vegan, but they are designed to ferment dairy milk. Plant-based milks (oat, soy, almond, coconut) can be used, however results vary significantly. Full-fat oat or soy milk tends to give the best results. We recommend experimenting with small quantities first.

Lactobacillus bulgaricus was first scientifically identified by Bulgarian physician Stamen Grigorov in 1905, isolated from traditional Bulgarian yogurt. It is named after Bulgaria specifically because of the country's centuries-old fermentation tradition.

Our cultures are developed from the authentic Balkan fermentation heritage, carefully selected and produced by ARFA ES LTD in Sofia, Bulgaria. When we say "Bulgarian," it's not a marketing claim — it's where our cultures genuinely come from.

Best results come from full-fat whole cow's milk, whether fresh or pasteurised. The higher fat content creates a richer, thicker, creamier result.

• Pasteurised milk — works perfectly. Heat to the required temperature before adding the sachet.
• Raw/unpasteurised milk — bring to a full boil first, then cool to the required temperature.
• UHT (long-life) milk — works, though the result may be slightly thinner.
• Skimmed or semi-skimmed milk — will ferment, but expect a thinner, less creamy result.
• Plant-based milks — cultures will ferment, but results are unpredictable. Full-fat oat or soy gives the best results.

No — a yogurt maker is helpful but not essential. The traditional Bulgarian method uses a blanket (or heavy towel) to insulate the milk and maintain fermentation temperature overnight.

Without a yogurt maker: Pour your inoculated milk into a glass jar or pot with a lid, wrap it tightly in a thick blanket, and leave it in a warm spot for 7–8 hours (yogurt) or 12–14 hours (kefir).

With a yogurt maker: set it to 42–43°C for yogurt or 35–40°C for kefir.

Runny yogurt is the most common first-batch issue. The most likely causes:

• Milk was too hot when you added the sachet — temperatures above 50°C kill the bacteria. Let the milk cool to 43–45°C first.
• Fermentation temperature dropped too much — if the environment cooled below 38°C, the bacteria slow significantly.
• Fermentation time was too short — give it the full 7–8 hours and don't move the vessel.
• Skimmed or low-fat milk used — use whole milk for best results.
• Refrigeration step skipped — the 6–7 hours of refrigeration after fermentation is essential for the final set.

Over-fermentation causes excess acidity. To fix this:

• Reduce fermentation time — try 6 hours instead of 8 for a milder result.
• Refrigerate as soon as it reaches your preferred consistency.
• Lower the fermentation temperature slightly — 41°C instead of 43°C slows the bacteria.

Note: some tartness is natural and correct. Authentic Bulgarian yogurt is noticeably tangier than commercial supermarket yogurt.

Yes — this is called back-slopping or re-culturing, and it's how traditional Bulgarian families have made yogurt for generations. Use 2–3 tablespoons of your freshly made yogurt as the starter for your next 1-litre batch.

• You can re-culture 3–5 times reliably before the culture begins to weaken.
• After this point, the yogurt may become thinner, less consistent, or more acidic.
• We recommend starting fresh with a new sachet every 4–6 batches for best results.

That's whey — and it's completely normal. Whey is the liquid that naturally separates from the yogurt solids during fermentation and refrigeration. It's a sign that your culture is active and working correctly.

You can stir it back in (it thins the yogurt slightly but adds protein and probiotics) or drain it off for a thicker, Greek-style result. Don't throw it away — it's nutrient-dense and great in smoothies, bread dough, or soups.

Kefir is actually easier to make without a yogurt maker than yogurt, because it ferments at a lower temperature (35–40°C) that most kitchens naturally maintain.

• Heat your milk to 35–40°C and stir in one sachet for 3–4 minutes.
• Pour into a clean glass jar, cover loosely (not airtight — kefir produces a little CO₂).
• Wrap in a towel and leave at room temperature (22–28°C ambient) for 12–14 hours.
• Refrigerate for 6–7 hours before serving.

Yes — and it's very easy. After your yogurt has set and been refrigerated, strain it through a fine cheesecloth, muslin cloth, or a clean tea towel placed over a bowl. Leave it in the fridge for 2–4 hours. The whey drains away and you're left with thick, creamy, Greek-style strained yogurt.

The longer you strain, the thicker the result. Strain for 8+ hours and you'll get labneh — a spreadable yogurt cheese. Season with olive oil and salt and serve with flatbread.

All orders ship from our facility in Sofia, Bulgaria (EU). Estimated delivery times:

• United States: 14–21 business days
• United Kingdom: 7–10 business days
• European Union: 5–7 business days
• Rest of world: 14–28 business days (contact us before ordering)

You'll receive a shipping confirmation email with a tracking number once your order has been dispatched.

No refrigeration required during shipping. Our sachets are fully shelf-stable and can be stored at room temperature (below 20°C / 68°F) for the duration of their 24-month shelf life. The live cultures are preserved in a dry, dormant state within each individually sealed sachet.

They will not be damaged by normal postal transit temperatures. Once you're ready to use a sachet, the bacteria reactivate when you add them to warm milk.

We want every order to reach you perfectly. If your order:

• Arrives damaged: take a photo and contact us at pambiotic@arfa7.com within 14 days of delivery. We'll send a replacement at no cost.
• Is marked delivered but not received: check with neighbours and your local post office first, then contact us within 7 days.
• Has not arrived after the maximum estimated window: contact us and we'll investigate with the carrier.

We offer a 30-day satisfaction guarantee. If you're not satisfied for any reason, contact us within 30 days of receiving your order and we'll offer either a full refund or a replacement — whichever you prefer.

Because our products are food items, we can't accept physical returns of opened sachets — but we won't require you to return anything. To start a refund, email pambiotic@arfa7.com with your order number.

Yes — we offer free shipping on all orders over $40 (US) / £35 (UK) / €40 (EU). A single box qualifies when combined with another product, or when you order the Starter Bundle.

Subscribers on our Subscribe & Save plan receive free shipping on all subscription orders, regardless of order value.

Subscribe & Save lets you receive your favourite Pambiotic cultures on a regular schedule at a 15% discount ($12.74 per box instead of $14.99). You choose your delivery frequency — every 4 weeks or every 8 weeks — and we handle the rest.

Before each renewal you'll receive a reminder email, giving you time to pause, skip, swap products, or update your address. You're never locked in — cancel or pause anytime, with no fees. Subscriptions are powered by Recharge.

Yes — all of the above, anytime, with no penalty.

• Pause: temporarily halt for up to 3 months, then resume automatically.
• Skip: skip one specific delivery.
• Cancel: cancel permanently at any time before your next billing date.
• Swap: change from Yogurt to Kefir Starter, or add the Bundle.

All of this is done through your personal Recharge customer portal.

Your first charge occurs at the time of your initial order. Subsequent charges occur on the same date each cycle (e.g. subscribe on the 15th and you'll be charged on the 15th for a 4-week plan).

You'll receive a reminder email 7 days before each renewal so you can make changes before the charge processes.

It depends on how often you make batches:

• Every 4 weeks — ideal if you make yogurt or kefir weekly. Our most popular plan.
• Every 8 weeks — better if you ferment every 2 weeks, or if you're just starting out.

You can switch frequencies at any time through your customer portal.

If a payment fails, Recharge automatically retries after 24 hours, and again after 48 hours. You'll receive an email notification each time so you can update your payment details.

If the payment cannot be processed after 3 attempts, your subscription is paused (not cancelled) and you'll receive instructions to update your billing information. We'll never cancel without notifying you.

Store in a cool, dry, dark place at a temperature below 20°C (68°F) — a kitchen cupboard away from the cooker or direct sunlight is ideal. No refrigeration required.

Do not store near heat sources (cooker, dishwasher, boiler) or in humid environments such as directly above a sink.

Shelf life: 24 months from production date. The best-before date and batch number are printed on the outer box.

Homemade yogurt and kefir keep in the refrigerator for 7–10 days in a clean, sealed container. The flavour becomes progressively more tangy as the bacteria continue (very slowly) producing lactic acid in the cold.

For best flavour and texture, consume within 5–7 days. There are no preservatives, so always check for off smells or discolouration before consuming after day 7. If you see pink, orange, or grey mould — do not consume.

Homemade fermented dairy is generally considered safe during pregnancy when made correctly — the live cultures are beneficial for gut health. However:

• Always use pasteurised milk — raw milk carries risks of harmful bacteria that are particularly dangerous during pregnancy.
• Ensure all equipment is thoroughly clean and sterilised.
• Consume within 5 days of making it.

If you have specific concerns, please consult your healthcare provider.

Our cultures are a fine, off-white to cream-coloured powder. Slight clumping is normal — caused by moisture in the air, it does not affect viability.

However, do not use a sachet if the foil packaging is punctured or torn, the powder has an unusual colour (yellow, grey, or dark spots), or there's an off smell. Contact us at pambiotic@arfa7.com with your batch number and we'll advise or replace it.

Yes. All Pambiotic products are produced under EU Good Manufacturing Practice (GMP) standards — the same quality standards required for pharmaceutical production in Europe.

Our products are produced by ARFA ES LTD, registered in Bulgaria (UIC 205173951), with facilities in Sofia. Full company information: ARFA ES LTD · 3 eng. Stoimen Sarafov Str., Sofia, Bulgaria · pambiotic@arfa7.com · +359 877 900 982.