Understanding Live and Active Cultures
All yogurt starts with live cultures, specifically Streptococcus thermophilus and Lactobacillus bulgaricus, which are responsible for fermenting milk into yogurt. However, not all yogurts retain these cultures by the time they reach your spoon. Post-fermentation heat treatment, sometimes used to prolong shelf life, can kill these beneficial microorganisms. When live cultures are present in adequate amounts, they are considered probiotics, which are defined as "live microorganisms that, when administered in adequate amounts, confer a health benefit on the host".
The Importance of the NYA 'Live & Active Cultures' Seal
The National Yogurt Association (NYA) offers a voluntary 'Live & Active Cultures (LAC)' seal for yogurt manufacturers. This seal provides a clear indicator that the yogurt contained a significant amount of live bacteria at the time of production. While the seal is a reliable marker, its absence does not necessarily mean a yogurt lacks live cultures, as some brands may choose not to participate in the program. The best practice is always to check the ingredients list for mentions of specific culture strains like L. acidophilus or Bifidus.
Popular Yogurt Brands with Live Cultures
Several well-known brands consistently offer products containing live cultures. The key is to look for the LAC seal or read the ingredients carefully. Below is a list of popular brands known for their live cultures:
- Activia: Owned by Danone, Activia is one of the most prominent brands in the probiotic yogurt market. It's specifically marketed for digestive health and contains a proprietary strain, Bifidobacterium animalis DN 173-010.
- Chobani: A popular Greek yogurt brand, Chobani lists multiple live and active cultures, including S. Thermophilus, L. Bulgaricus, L. Acidophilus, Bifidus, L. Casei, and L. Rhamnosus. Many of their products bear the LAC seal.
- Stonyfield Organic: This brand is known for its organic dairy products and includes multiple live cultures in its offerings, such as Bifidobacterium BB-12®, L. acidophilus, and L. paracasei.
- Fage: An authentic Greek yogurt brand, Fage contains a rich blend of live cultures, including L. Bulgaricus, S. Thermophilus, L. Acidophilus, Bifidus, and L. Casei, offering a thick, creamy product.
- Siggi's: Makers of Icelandic-style skyr, Siggi's features a high-protein, low-sugar product with a tart flavor profile. Its live cultures include S. thermophilus, L. bulgaricus, B. lactis, and L. acidophilus.
- Wallaby Organic: This Aussie Greek-style yogurt is slow-crafted and lists live and active probiotic cultures such as L. acidophilus, L. bulgaricus, and S. thermophilus.
- Yoplait: Many Yoplait products, including their original and Go-Gurt lines, are made with live and active cultures. Consumers should verify the specific strains on the label.
- Noosa: Known for its velvety texture and real fruit purees, Noosa yogurt contains live active cultures, including L. acidophilus and L. bulgaricus.
- Kefir (e.g., Lifeway): Kefir is a distinct fermented milk product that typically contains an even greater diversity of probiotic strains than yogurt. Brands like Lifeway are specifically known for their high probiotic content.
Comparing Top Brands with Live Cultures
To help you decide, here is a comparison of some popular brands with live cultures:
| Feature | Chobani | Stonyfield Organic | Fage Total | Activia | Siggi's | Wallaby Organic |
|---|---|---|---|---|---|---|
| Culture Strains | S. Thermophilus, L. Bulgaricus, L. Acidophilus, Bifidus, L. Casei, L. Rhamnosus | S. thermophilus, L. bulgaricus, Bifidobacterium BB-12®, L. acidophilus, L. paracasei, L. rhamnosus | L. Bulgaricus, S. Thermophilus, L. Acidophilus, Bifidus, L. Casei | Bifidobacterium animalis DN 173-010, S. thermophilus, L. bulgaricus | S. thermophilus, L. delbrueckii subsp. bulgaricus, B. lactis, L. acidophilus | L. Acidophilus, L. Bulgaricus, S. Thermophilus, Bifidus, L. Paracasei |
| Style | Greek | Traditional / Greek | Strained Greek | Traditional | Icelandic Skyr | Aussie Greek |
| Texture | Thick and creamy | Smooth and creamy | Unbelievably thick | Smooth | Very thick | Creamy and mild |
| Noted Benefit | Gut health, high protein | Gut health, organic | High protein, natural | Digestive regularity | High protein, low sugar | Organic, slow-crafted |
| Special Note | Wide variety of flavors and products (Zero Sugar, Less Sugar, etc.) | Organic milk from pasture-raised cows | Made with only milk and cultures, no additives | Focuses on digestive regularity | Less sweet, authentic Icelandic recipe | Pasteurized, slow-crafted process |
How to Find Live Cultures in Yogurt
- Check the label for the LAC seal: The NYA seal is an easy visual cue that the product has a verified high level of live cultures.
- Read the ingredients: The ingredients list will often explicitly name the bacterial cultures used, such as Lactobacillus or Bifidobacterium strains.
- Opt for refrigerated over frozen: The live cultures in refrigerated yogurt are more active than those in frozen yogurt, although freezing doesn't necessarily kill them. Heat-treated frozen yogurt, however, will have no live cultures. Always check the label on frozen varieties.
- Avoid heat-treated products: The label may state "heat-treated after culturing," which means the beneficial bacteria have been killed off. This is more common in yogurts with a longer shelf life.
- Choose plain, unsweetened varieties: Adding your own fruit, honey, or granola allows you to control the sugar content. Many sweetened yogurts have high sugar content, which can be counterproductive to health goals.
Conclusion
For consumers seeking yogurts with live cultures, a wide variety of excellent options are available, ranging from traditional and Greek-style yogurts to Icelandic skyr and probiotic drinks like kefir. The key is to be an attentive shopper and read labels carefully. Look for the NYA 'Live & Active Cultures' seal or check the ingredients list for specific bacterial names. Brands like Chobani, Activia, Stonyfield Organic, Fage, Siggi's, and Wallaby are reliable choices for their probiotic content. By choosing the right yogurt, you can easily incorporate beneficial bacteria into your daily diet to support your overall gut health.
International Dairy Foods Association: Live & Active Cultures Seal