| Strain | Source |
| Lactobacillus acidophilus NCFM | Rhodia, Inc. (Madison, Wis.) |
| Lactobacillus acidophilus DDS-1 | Nebraska Cultures, Inc. (Lincoln, Neb.) |
| Lactobacillus acidophilus SBT-2062 | Snow Brand Milk Products Co., Ltd. (Tokyo, Japan) |
| Lactobacillus acidophilus LA-1 | Chr. Hansen, Inc. (Milwaukee, Wis.) (same as strain LA-5 sole in Europe) |
| Lactobacillus casei Shirota | Yakult (Tokyo, Japan) |
| Lactobacillus casei Immunitas | Danone (Paris, France) |
| Lactobacillus fermentum RC-14 | Urex Biotech (London, Ontario, Canada) |
| Lactobacillus johnsonii La1 | Nestle' (Lausanne, Switzerland) (same as Lj1) |
| Lactobacillus paracasei CRL 431 | Chr. Hansen, Inc. (Milwaukee, Wis.) |
| Lactobacillus plantarum 299V | Probi AB (Lund, Sweden) (same as MM2) |
| Lactobacillus reuteri SD2112 | Biogaia (Raleigh, N.C.) |
| Lactobacillus thamnosus GG | Valio Dairy (Helsinki, Finland) |
| Lactobacillus thamnosus GR-1 | Urex Biotech (London, Ontario, Canada) |
| Lactobacillus thamnosus 271 | Probi AB (Lund, Sweden) |
| Lactobacillus rhamnosus LB21 | Essum AB (Umea, Sweden) |
| Lactobacillus salivarius UCC118 | University College (Cork, Ireland) |
| Lactobacillus lactic L1A | Essum AB (Umea, Sweden) |
| Bifidobacterium lactic Bb-12 | Chr. Hansen, Inc. (Milwaukee, Wis.) |
| Bifidobacterium longum BB536 | Morinaga Milk Industry Co., Ltd. (Zama-City, Japan) |
| Bifidobacterium longum SBT-2928 | Snow Brand Milk Products Co., Ltd. (Tokyo, Japan) |
| Bifidobacterium breve strain Yakult | Yakult (Tokyo, Japan) |