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Theralac is a unique, high-strength probiotic. Formulated to help restore digestive regularity, improve nutrient absorption and enhance immunity, Theralac uses new patent-protected technology to deliver a product that is able to survive harsh stomach acid conditions and colonise the bowel with good microbes.

In recent years, we've heard many good things about probiotics. There was the University of Colorado Boulder study which showed their ability to improve sleeping patterns and combat stress; the Finnish study underscoring their effectiveness in alleviating symptoms of birch pollen allergy; and the 2017 University of Florida study which showed they could lessen the impact of hay fever.

What Makes Theralac Special?

Unlike most probiotic supplements, Theralac is guaranteed to deliver 5 different strains of live Lactobacillus and Bifidobacterium probiotics deep into the intestinal tract. These clinically-proven strains work to encourage the exclusion of undesirable microorganisms and also the modulation of immune and digestive systems.

The probiotic strains supplied by Theralac do not fight each other, but rather work in synergy to colonise the interior surfaces of your small intestine. Furthermore, the probiotic microorganisms (all five strains) are sticky, able to colonise human HT-29 and Caco-2 cells in vitro, giving them a competitive advantage over less sticky microorganisms.

3rd party tests verify that Theralac is guaranteed to provide at least 30 billion CFU of beneficial probiotic microorganisms per capsule until expiry and, thanks to its patent-protected alginate delivery capsule, these microorganisms are guaranteed to arrive alive and functioning at optimum strength. 

Patented Acid-Proof Delivery

The harsh acidity of your stomach can (and will) denature most probiotic supplements before they can reach the intestinal tract. However, Theralac’s patent-protected acid-proof delivery technology utilises sodium alginate from seaweed in a unique formulation that assures survival at pH 1.6 for 90 minutes – the most severe stomach acid conditions normally experienced. 

Theralac's unique delivery method can also help assure colonisation by keeping probiotic cells together in a viscous alginate-gel moving in group-force, not as separate individual cells like other probiotics, deep into the intestinal tract while retaining key formula ingredients in close proximity.

Unique Prebiotic Stimulants

It’s not good enough to simply deliver probiotic cells alive and deep into the intestinal tract: they must also be awakened with a special prebiotic nutrient in order to begin growth and encourage colonisation. Unlike other prebiotics that utilise soluble fibres such as FOS and Inulin, and require 3-8 grams per dose to be effective, Theralac uses a special nutrient called Lactostim to achieve this.

Lactostim is made by combining two natural substances – sunflower lecithin and oleic acid. Because it is effective in milligram (mg) quantities, it can fit along with the probiotics in a single capsule, where it works to stimulate all five probiotic strains once they reach the intestinal tract.

Theralac is also available in powdered form, which is ideal for those who dislike swallowing capsules. Granular Theralac is identical to Theralac, minus the presence of an alginate delivery capsule. Instead, granular Theralac uses an acid-proof gel matrix to deliver over 30 billion CFU of probiotics deep into the gastrointestinal tract, without the interference of stomach acid. This gel matrix forms around the product when it is folded gently into semi-solid food like yoghurt or apple sauce.

Digestive Support Pack

We also offer a combined Digestive Support Pack which includes 1 bottle of Theralac, 1 bottle of TruFlora, 1 bottle of TruFiber and 1 bottle of Enzalase. These products working together offer a synergistic solution to improved bowel health.

Product Available Price Qty
Theralac - 30 Caps

Theralac - 30 Caps

In stock In stock
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Granular Theralac - 30g

Granular Theralac - 30g

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Theralac 30 Capsules and Truflora 32 Capsules

Theralac 30 Capsules and Truflora 32 Capsules

In stock In stock

Was £72.50

Now £65.25

Digestive Support Pack

Digestive Support Pack

In stock In stock

Was £135.00

Now £120.75

Most probiotic supplements will give you a guaranteed probiotics count on the date of manufacture, which means that they can arrive with a significantly lower total probiotic count. Theralac has a probiotic count that’s guaranteed until the date of expiry, which means that you will definitely receive the full probiotic content.

Theralac is guaranteed to provide at least 30 billion CFU until expiry, but it’s actually formulated at between 40 and 50 billion CFU of Lactobacillus and Bifidobacterium probiotics per capsule.

In the gut, these colony forming units are activated by patented prebiotic stimulants, and begin immediately colonizing the entirety of the G.I. tract.

The Lactobacillus or “Lacto” strains are most active in the small intestine, particularly in the lower section called the ileum, and are understood to adhere to the soft surfaces here to help promote a healthy surface. The Bifidobacterium or “Bifido” strains are most active in the colon, and work to promote healthy structure and function

Together, all five of the different Lactobacillus and Bifidobacterium strains in Theralac provide almost universal coverage, the end result of which is improved regularity, the exclusion of undesirable microorganisms, the enhancement of your immune system, and also an enhanced ability to absorb nutrients and minerals from your diet.

A Note on Probiotic Rotation

Theralac works very well on its own, and has been shown in numerous scientific studies to be highly beneficial even without support from other probiotic supplements. The probiotics in Theralac will benefit from the addition of an enzyme supplement though, and also lend themselves well to combination with TruFlora – a probiotic supplement that focuses on colonizing intestinal contents, instead of lining.

In conjunction with TruFlora, Theralac can help to promote intestinal biodiversity, and also encourage the development of a fully colonized (and therefore healthy) gastrointestinal tract. For more information on using Theralac in rotation with other Master Supplements products, please click here.

Antibiotics Should Also mean Probiotics...

... and the best probiotic for this cause is Theralac. Everyone is very familiar with antibiotics and their intended goal - to kill harmful bacteria that cause us to be sick. However, the big issue here is that antibiotics also kill the beneficial bacteria that live in our digestive tract, which can cause other problems such as diarrhea or lowered intestinal immunity. For more information on this, click here.

Still not convinced about Theralac? Perhaps this will convince you.

Each capsule of Theralac contains 5 different strains of lactobacillus and bifidobacterium probiotics, alongside Microcrystalline cellulose, sodium alginate, hydoxpropyl methyl cellulose (capsule shell). Tri-sodium phosphate, magnesium stearate, silicon dioxide, calcium silicate, ascorbic acid and LactoStim (sunflower lecithin + oleic acid.

Theralac does not contain any milk, gluten, wheat, soy, yeast, casein, nuts, seafood or beef products.

Each batch of Theralac is laboratory tested to meet strict quality control standards, and is guaranteed to provide 30 billion CFU per capsule, until the date of expiration.

For best results, take one capsule of Theralac daily for two weeks. Thereafter, take one capsule every three days to maintain digestive care.

Theralac can be taken with antibiotics - it is important to allow at least 3 hours separation though.

Fold (do not MIX) 1/4 tsp of Granular Theralac into apple sauce or another soft food. Wait one minute before serving. Repeat daily for two weeks, then twice a week after that. When taking Granular Theralac with antibiotics, allow at least 3 hours in between.

Serving size: one capsule Servings/bottle: 30  
  Amount Per Serving %D/V

Probiotic Blend

- Lactobacillus acidophilus
(Strain LA-1)

10 billion CFU*


- Bifidobacterium lactis

(Strain BL-04)

10 billion CFU* **

- Lactobacillus rhamnosus

(Strain (LR-44)

2 billion CFU* **

- Lactobacillus paracasei

(Strain F-19)

5 billion CFU* **

- Bifidobacterium lactis

(Strain Bi-07)
3 billion CFU* **

Daily Value not established


What are probiotics?

Probiotics are beneficial bacteria that are able to colonize the intestinal tract and help promote healthy structure and function; Lactobacillus acidophilus is an example of a well known probiotic. Probiotics can be taken in low doses to assist in regularity, elimination, nutrient absorption, or to help boost the immune system. Probiotics may be effective in higher doses for more serious conditions but we recommend that you speak with your healthcare professional to see what is best for you. Theralac is extremely powerful and everyone's digestive system is different so it is important to use this product as it best fits your specific needs.

Is Theralac the same as Acidophilus?

Yes, but much more...Theralac capsules contain 10 billion CFU of Lactobacillus acidophilus (LA-1 strain), a well documented, bile tolerant strain with a long history of use in human dietary supplements. This makes Theralac five times stronger in "Acidophilus" than most probiotic products. Additionally, Theralac contains 20 billion CFU of four symbiotic probiotics that go beyond the capability of Acidophilus: These are select strains of lactobacillus and Bifidobacterium species that are backed by over 100+ scientific studies. ONLY THERALAC CONTAINS THIS BLEND OF RESEARCH PROVEN PROBIOTIC STRAINS.

What is a CFU and why do I need so many?

CFU stands for Colony Forming Unit. It's the number of bacterial colonies that form on a Petri dish and indicates a product's viability or strength. Your intestinal tract contains over 1OO trillion microorganisms from about 500 different species, mostly bacteria. Only high potency probiotic products (those containing 10 billion CFU/capsule or more) can reliably re-establish the probiotic population within this huge number.

How many CFU are in each Theralac capsule?

Theralac is formulated at > 40 billion CFU per capsule; and guaranteed through expiration at 30 billion CFU/capsule. The CFU strength of each strain is specified separately. Theralac can be held at ambient temperature for up to one month, two years refrigerated; it is packaged in nitrogen-flushed amber glass bottles.

Is a probiotic deficiency common?

Quite common! Many lifestyle factors favour undesirable microorganisms over probiotics in your intestinal tract: stress, poor diet (sugar and fat), alcohol, prescription drugs, travel, frequent colds or infections, and aging are the big ones. It's hard for a modern person not to have a probiotic deficiency to some degree.

What are the symptoms of a probiotic deficiency?

Symptoms vary from person to person but may include one or more of the following: Constipation or diarrhea, indigestion, incomplete digestion, heartburn, excess gas and bloating, lactose intolerance, weak immune response (frequent colds and infections), fatigue, low energy, muscle weakness, and food allergies. Obviously, you cannot be at peak health if you have a probiotic deficiency!

Do I need to take Theralac every day to correct a probiotic deficiency?

No. Theralac's advanced, high potency formulation allows you to take two capsules per week once your intestinal tract's microflora has been balanced (this occurs for most people after taking Theralac daily for two weeks). The ability to take a probiotic twice a week provides convenience and cost savings.  On the maintenance dose a bottle of Theralac can last up to 4 months and cost less than $3.00 a week!

NOTE: Taking Theralac daily for two weeks provides 560 billion CFU to your intestinal tract, a very effective dose by probiotic standards. Once this dose colonizes the intestinal tract it can be maintained by taking two capsules (80 billion CFU) per week.

What is a prebiotic?

A food grade substance that benefits probiotic bacteria by some specific mechanism.

How do Theralac's prebiotics work?

Theralac contains two prebiotics that are effective at low dosages; LactoStim (patented) and Sodium Alginate.  LactoStim is a food grade emulsifier that stimulates the growth and reproduction of Theralac's probiotic bacteria (patented).  Unlike FOS and other prebiotics, Lactostim works in mg quantities! 

Are there other prebiotics that benefit Theralac's probiotics?

Yes. A soluble fiber like PHGG (Partially Hydrolyzed Guar Gum) or inulin is beneficial. Fiber digesting enzymes will also release soluble fiber (like FOS) from the diet.

Will foods rich in FOS also benefit Theralac's probiotics?

Yes. FOS, or fructooligosaccharides, are prebiotics that you can get by eating certain foods, and are required in larger quantities compared  LactoStim. FOS can cause gas in some individuals when taken as an isolated prebiotic. When taken in food, the unidentified nutrient factors help reduce the gas issue.  For the best prebiotic, take TruFiber see

The following foods contain a unique source of soluble fiber (FOS) that stimulates probiotic bacteria. Eat some when you take Theralac!







Rye Bread


Brown Sugar












So, how does Theralac work in my intestinal tract?

The probiotic bacteria in Theralac attach to the soft lining (wall) of your intestinal tract and help keep it healthy. The Lactobacillus ("Lacto") strains are most active in the small intestine while the Bifidobacterium ("Bifido") strains work best in the large intestine (colon). A healthy intestinal wall encourages optimum absorption of nutrients, including vitamins and minerals, and supports healthy digestion and elimination. Theralac also benefits your immune system...

How does Theralac benefit my immune system?

Too many strains can compete with each other and reduce effectiveness. Single strain products do not provide enough biodiversity to cover the entire intestinal tract. However, Theralac's five probiotic strains work together (in symbiosis) to stimulate the mucosal immune system on the intestinal surface which then sends activation signals to the body's systemic immune system. Because Theralac's strains are beneficial this action is gentle and modulated. The immune system is put on "yellow alert" so to speak, ready to act quickly when pathogenic microorganisms appear. The Lactobacillus strains in Theralac upgrade cellular immunity by spurring Th-1-cells and macrophages to produce TNF-alpha and INF-gamma (Food Protection, 2000, 63(5): 638-644). This is a direct initial response resulting from the body sensing the non-human character of probiotic cells before recognizing they are harmless and beneficial. Following quickly is a balanced response where the Bifidobacterium strains in Theralac encourages IL-10 production from Th-2 and T-reg cells (World J. Gastroenterology, 2007, 13(2): 236-243) Assaults get defeated faster and things calm down fast.

What is the most common effect I will experience when taking Theralac?

Improved elimination and regularity: Softer and more predictable bowel movements followed by more energy and intestinal comfort.

Is it best to take Theralac with food or on an empty stomach?

Either way works well due to Theralac's ACID PROOF formulation. Take Theralac with water, fruit juice or milk.

How does Theralac's acid-proof formula compare to enteric coated probiotics?

Much better and safer! Theralac utilizes a proprietary form of sodium alignate that develops a buffered gel that protects probiotics in stomach acid. This is more effective than enteric coatings. Many probiotics products, including probiotic yogurts, experience 99.9% kill when exposed to stomach acid below pH 2.0 for 90 minutes. Theralac manages to survive these conditions. 

Can I take Theralac when taking antibiotics?

Yes. Take the antibiotic at the prescribed time followed by Theralac two-three hours later. Continue taking Theralac daily for at least two weeks after finishing the antibiotics.

How many Theralac capsules should I take when travelling?

Take at least one per day. When travelling to developing countries take two per day, one in the morning and one in the evening. Intestinal problems are easier to prevent than treat so start taking Theralac daily one week before you leave.

It says on the Theralac bottle, "Best if Refrigerated"; how stable is Theralac at room temperature when travelling?

Theralac can be held at room temperature (65°-75° F) for up to 30 days without loss in viability. Keep bottle tightly closed and out of direct sunlight.

Can Theralac reduce lactose intolerance?

Lactose intolerance results from a lack of the enzyme lactase in the small intestine. All five of Theralac's probiotic strains produce lactase and may reduce the severity of lactose intolerance.

Can Theralac improve vitamin and mineral absorption?

Vitamins and minerals are absorbed in the small intestine. The health and integrity of the intestinal soft lining (wall or mucosa) affects the absorption of all nutrients including vitamins and minerals. Theralac may help improve vitamin and mineral absorption by maintaining a healthy soft lining. In addition, mineral absorption, especially calcium and magnesium, is improved by a slightly acid pH at the mucosal surface. The probiotic strains in Theralac produce lactic and acetic acids which lower pH (acidify), if this occurs on the surface of the soft lining it may enhance Ca and Mg absorption.

Can I overdose on Theralac?

What would be the effect? Probiotic bacteria, including those in Theralac, have been used in dosages of one trillion CFU/day or more without harmful effects. At very high dosages probiotics may cause diarrhea in some people which can be eliminated by reducing the dose. Sometimes when high potency probiotics are used for the first time a short period of discomfort results while the intestinal tract's microflora is being rebalanced. This is called the Herxheimer Reaction.

Can you explain the Herxheimer Reaction in more detail?

The Herxheimer Reaction is a period of discomfort that sometimes results when harmful microorganisms are rapidly killed off in the intestinal tract and their toxic byproducts accumulate prior to elimination. When the intestinal tract is severely out of balance (has low numbers of probiotic bacteria) and one takes a high potency probiotic, it may cause a sudden die off of harmful bacteria (or yeast) followed by detoxification symptoms such as bloating, cramping, gas or headaches. Usually these symptoms subside in a short time as the probiotics gain control and the harmful microorganisms are eliminated. If this happens, stay the course with the probiotic or lessen the dose slightly. If severe or persistent symptoms occur see your doctor.

Why are Theralac capsules made of cellulose (Vegicaps) instead of gelatin?

Gelatin is derived from beef byproducts and is not acceptable to vegetarians. Some non-vegetarians object to beef byproducts for other reasons. Vegicaps are made from materials of plant origin. Theralac does not contain any: milk, yeast, eggs, corn, soy, gluten, wheat, casein, nuts, seafood or beef products.

What 3 core strains does Theralac contain?

Theralac contains Lactobacillus acidophilus (LA-1 (NCFM)), Bifidobacterium lactis BL-04 (BL-34) and Bifidobacterium lactis Bi-07. These are backed by clinical studies that show positive results. Theralac also contains two synergistic support strains: Lactobacillus paracasei Lpc-37 and Lactobacillus rhamnosus Lr-32 that support the immune system.

Is the Theralac Alginate Technology Patented?

Yes, it is. U.S. Patents 7,229,818 and 7,122,370 define and protect the formulation and also permit DEEP CONCENTRATED DELIVERY into the lower G.I tract. The probiotic strains remain protected in the alginate-gel as it moves through the lower hostile environments such as the duodenum (containing proteolytic enzymes and bile salts) mostly staying together as billions of CFU in clumps until they arrive in the lower small intestine and colon. This is where concentrated probiotic strength is required. Some CFU do release in the upper G.I. tract along the route but most arrive deep.

Probiotic products that allow their strains to disperse and spread out in the upper small intestine do not reach the lower G.I. tract as a unified force. The microbial competition in the colon can be a million times higher compared to the upper small intestine. Theralac stays concentrated and works deep.

How quick is colonization?

All 5 strains in Theralac adhere to HT-20 and Caco-2 human epithelial cells meaning they stick to intestinal surfaces. Once in place they immediately begin producing lactic acid, their main weapon against undesirable microbial competition. This allows them to competitively exclude undesirable microorganisms from their specific area. Like in a game of Risk -- the more good bugs you have in a particular space, the greater the success. It's referred to as Competitive Exclusion (C.E.) and Theralac does it best.

Note: Lactic acid producing activity is analyzed on every lot of Theralac as are CFU and Purity. These are reported by lot number at The assay for lactic acid production typically exceeds 1l.2% in 12 hours, well beyond what competitive products produce.

What is the Patented Rehydration Technology?

When probiotics arrive deep in the G.I. tract where microbial competitive is severe, it is necessary to properly rehydrate them. Most probiotics have been freeze-dried and their cellular membranes are dry and brittle. If they wake up in a hostile environment without urgent care, their membranes break and they fail to thrive. The Theralac formulation contains sunflower lecithin and oleic acid (LactoStim™) which saves the day by providing phopholipids that heal any nicks and cracks in the membranes. Five U.S. Patents protect this process.

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At Water for Health we want prospective clients to buy from us with confidence. Our mission is to make a difference in the quality of life of as many people we can. We have very many customers who tell us we have made a difference to them and this inspires us to continue to do what we do. To underpin our commitment we offer the following 7 point guarantee.

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