Natren has been offering the highest quality probiotic supplements in the world since 1982, making us the world leader in probiotics. Our custom probiotic products are manufactured in a state-of-the-art facility in Westlake Village, California that is International cGMP certified and audited by Australia's TGA (Therapeutic Goods Administration) - signatory to the PIC/S (Pharmaceutical Inspection Convention / Scheme, Geneva Switzerland).

Natren has been manufacturing LIFE START infant probiotics for over 20 years. This children's probiotic powder was specifically formulated for a baby's developing gastrointestinal tract. Natren is one of the only companies with experience in culturing the extremely picky bacteria strain Bifidobacterium infantis, which needs a very specific, oxygen-free environment in which to grow.

Natren manufactures the highest quality custom probiotics available to help  bodies of all ages obtain optimal health. Natren products help promote natural and proper digestion.* Natren guarantees the potency of all its probiotic supplements through the expiration date printed on the label, if stored under the conditions on the label.

Even if you did not have the right start in life, Natren has a full range of probiotic products that support the entire gastrointestinal tract. With the support of Natren's custom probiotics, you have help in obtaining optimal health at any age.*


Natasha Trenev is continuing her centuries-old family tradition of making quality beneficial bacteria supplements. As a world-renowned authority on custom probiotics, she has dedicated her life to studying the effects of beneficial bacteria, choosing only the safest and most effective bacteria strains for her products.

After starting Natren in 1982, Natasha continued to research, formulate and manufacture new probiotic products for human health. Her efforts led to the establishment of the entire probiotics category in North America, Australia, England, Holland and Belgium. Natasha authored the Probiotic Standards adopted by the National Nutritional Foods Association in 1989. Due to her expertise and dedication, Natren is recognized as the world leader in probiotics.

Natasha's mission is to educate everyone about the benefits of probiotics and a balanced microflora for good health. She shares her vast knowledge of probiotics for children, adults and pets through lectures, radio and television shows, and easy-to-read educational books.




  1. Aid the digestive system*
  2. Support general wellness*
  3. Gentle formula for babies tummy



International cGMP certified and audited by Australia's TGA (Therapeutic Goods Administration) - signatory to the PIC/S (Pharmaceutical Inspection Convention / Scheme, Geneva Switzerland

Forty countries are signatories to this international convention, including America's Food and Drug Administration. This international certification process mirrors pharmaceutical guidelines, and is very stringent to assure our ingredients, practices and products meet the highest standards. We know of no other custom probiotic company that has this certification.



When you realize that you have a new baby on the way, your perspective totally changes. Beyond whether the child will be a boy or girl, new moms-to-be always hope that the baby will be healthy and strong. Pregnant women know that the health of the baby depends on the mother. Regular visits to your healthcare professional, an adequate and nutritious diet, and appropriate levels of exercise all keep you and the developing baby healthy.

However, there is one aspect of health that most moms don't consider - vaginal health. The hydrogen peroxide-producing beneficial bacteria that normally keep the vaginal tract free of undesirable microorganisms are diminished by the stress of a modern lifestyle, environmental pollutants, birth control pills, antibiotics and other medications.

HEALTHY TRINITY® is the essential probiotic supplement for the pregnant woman. The three powerful super strains Lactobacillus acidophilus NAS, Bifidobacterium bifidum Malyoth and Lactobacillus bulgaricus LB-51 can help maintain a healthy balance of beneficial bacteria in the gastrointestinal and vaginal tracts.

The beneficial bacteria in this important probiotic supplement produce hydrogen peroxide (H2O2) that can help support the vaginal and intestinal tracts.* LIFE START® and HEALTHY TRINITY can be administered in a joint program that will prepare the mother to give her baby the best start possible when delivery time arrives.




Bifidobacterium infantis

Trillions of live bacteria are in the human gastrointestinal tract, performing vital biological functions that keep the body operating efficiently. But we are not born with these tiny microbes - the gastrointestinal tract of the fetus is sterile. We have to acquire these beneficial bacteria.

From the moment of birth, live bacteria are transferred from the mother, milk and the environment. If the baby was born naturally, from a healthy, breast-feeding mother, the healthy bacteria from the vaginal tract, breast milk and milk ducts take up residence in the mouth, nose, intestines and urogenital tract of the baby.

The Bifidobacterium family has a unique and powerful member, Bifidobacterium infantis, especially found in healthy babies. No matter how the baby was born or fed, LIFE START probiotics for infants provides the essential component to help the baby thrive. The probiotic benefits of the perfect baby bacteria, Bifidobacteriuminfantis, NLS super strain, can help give the developing child the best start possible.





Start your baby's health the right way with LIFE START, containing the best probiotic for infants,Bifidobacterium infantis, NLS super strain.

Not only does Bifidobacterium infantis, NLS super strain support the gut, it has a very unique and important property. The Bifidobacterium species can help support the new digestive system when exposed to naturally occurring substances.*  This perfect infant probiotic bacterium supports the digestive system.*

Other ingredients - Nonfat milk and whey. Contains no preservatives or artificial colors or flavors.

Potency guarantee -

1 billion live, active Bifidobacterium infantis, NLS super strain per serving (approximately 1⁄4 level tsp.) Guaranteed through expiration date if kept dry and refrigerated.


Supplement Facts

Serving Size: 0.5g (approx. 1⁄4 level tsp)
Amount per Serving
Vitamin C 15mg
Bifidobacterium infantis Super Strain NLS
†Daily Value (DV) not established.
1 billion cfu †



Suggested use of infant probiotics - Give 0.5 grams (approx. 1/4 level tsp.) mixed with 1 oz. unchilled, filtered water, breast milk or infant formula daily. If using breast milk or infant formula, use a small portion to dissolve LIFE START infant probiotic, and then add the mixture to the remaining breast milk or formula in the baby's bottle. Shake bottle to mix thoroughly.

When solid foods are added to the baby's diet, LIFE START probiotic for infants may be mixed in a small amount of lukewarm oatmeal, apple sauce, yogurt, mashed potatoes or natural, non-acidic creamy foods.

Suggested use for expectant and nursing mothers -Take 1 gram (approx. 1/2 leveltsp.) and 1 HEALTHY TRINITY® capsule or 1 servingof the HEALTHY START SYSTEM® daily** Mix the probiotic powdersin 6 oz. of unchilled, filtered water, nonfat milkor non-acidic juice. The quantity may be increasedto any amount needed, as probiotic products are not toxicat any level.



Q. Why does LIFE START contain Bifidobacterium infantis?
A. Bifidobacterium infantis is one of the most important bacteria species found in a healthy infant's gastrointestinal tract.

Q. Why should babies take Bifidobacterium infantisinstead of Lactobacillus acidophilus?
A. Bifidobacterium infantis is the best probiotic for infants because it is the predominant organism in the large intestine of healthy breast-fed babies. For optimal probiotic benefits, it is recommended that the baby be old enough to be weaned off breast milk or formula before starting L. acidophilus.

Q. Can I mix LIFE START with MEGADOPHILUS® or other Natren products?
A. Yes, you may mix any or all four Natren beneficial bacteria strains together immediately before taking. However, it is recommended that you give babies only Bifidobacterium species until they are weaned off breast milk or formula.

Q. Can I take LIFE START with milk, juice, coffee, etc.?
A. The stomach secretes digestive juices that inhibit all bacteria. These digestive juices, especially hydrochloric acid, may destroy the healthy bacteria. Always take probiotic supplements with unchilled, filtered (chlorine-free) water, nonfat milk, or take with filtered, non-acidic juices (i.e. apple, pear, etc.).

Q. Why should I take LIFE START before meals?
A. The digestive system is relatively inactive before meals. You may take LIFE START alone or mix with other Natren probiotic products. LIFE START infant probiotics mixed with unchilled, filtered (chlorine-free) water is a neutral substance that does not elicit any digestive activity. Therefore, LIFE START's live bacteria can easily pass by the stomach, unaffected, and continue to thrive in the small and large intestines.

Q. Why does Natren recommend the use of unchilled, filtered (chlorine-free) water with their probiotic products, and not ordinary tap water?
A. Tap water often contains chlorine or fluoride with pesticide residues and other undesirable chemicals. Since chlorine is used to destroy harmful bacteria, these chemicals will harm the beneficial bacteria as well, diminishing the benefits of probiotics.



Bifidobacterium - A genus of bacteria that make up the gut microflora, especially in the colon.
Bifidobacterium infantis, NLS strain - For improvement and maintenance of infants' health, B. infantis is one of the most important beneficial bacteria in their gastrointestinal tracts.
Genus - A classification of plants or animals consisting of 2 or more closely related, similar species.
Lactic acid - A syrupy liquid, occurring in sour milk, yogurt, molasses and various fruits. Used in foods as a flavoring, a preservative and an acidic ingredient.
Preterm birth - Births that occur before the 37th week of gestation. A full-term pregnancy lasts 40 weeks.
Urogenital tract - The organs involved in the formation and excretion of urine together with those involved in sexual reproduction.

CAUTION: LIFE START, with Bifidobacterium infantis, NLS super strain, is a milk-based probiotic for infants and should be carefully evaluated. Please consult with your physician before using LIFE START. Some individuals and/or ethnic groups may be allergic to the milk protein “casein”, found in both cow and goat milk. You may use BIFIDO FACTOR® dairy free probiotics instead.

Another option is LIFE START 2, a probiotic product formulated from goat's milk for sensitive digestive systems. Please call Natren's experienced custom probiotic consultants to discuss the use of these products. Lactobacillus acidophilus supplementation is not recommended for infants without the advice of a physician, as it is not the prominent beneficial microorganism in healthy, breast-fed infants. After weaning, Lactobacillus acidophilus increases in the small intestine.**