• Dairy Free
  • Gluten Free
  • Stevia Free
  • GMP
  • Halal
  • Kosher
  • Non GMO
  • Vegan
Low-FODMAP, water-soluble prebiotic fibre to support microbial diversity

A colourless, flavourless prebiotic fibre derived from the seeds of the guar plant. This powder dissolves in water and has shown to be well tolerated in individuals with bowel symptoms, including IBS and SIBO.

Clinically, PHGG is used as:
– A bulking agent and prebiotic to help balance faecal movements – both constipation and diarrhoea
– A prebiotic food source to increase Bifidobacterium and other SCFA producing bacteria
– A dietary fibre to increase satiety

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Key Benefits

A soluble source of prebiotic fibre for both constipation and diarrhoea
Derived from guar beans, PHGG is a convenient source of vegan dietary fibre that helps support the balance of faecal movements (i.e constipation and diarrhoea)

Rebalances the gut and increases microbial diversity
Selectively feeds gut microbiota (Bifidobacterium and other SCFA producing bacteria) to rebalance the gut microbiome and increase diversity.

Suitable for those with existing bowel symptoms
PHGG dissolves in water with no flavour and is well tolerated in individuals with existing bowel symptoms such as IBS or SIBO.

A heat-stable prebiotic

PHGG is a heat-stable prebiotic that can be baked into foods, added into stovetop meals and smoothies or added to your morning cup of coffee or tea.


5 reviews for Bio.Me Prebio PHGG 225g

  1. Sally Raynor verified buyer

    Great product. This has really helped my gut issues, less (or no) bloating and regular motions. Happy gut, happy me.

  2. Selina Moore verified buyer

    This has made a huge difference to my gut health. It helps me manage my diverticulitis – and has meant I can get back to a much more varied and healthier diet. Highly recommended for anyone wanting to maintain good gut health.

  3. Ruth Reynolds verified healthcare provider

    This is one of my favourite Invivo products. It’s my go to for clients with bloating and has become an essential part of my protocol.

  4. Gillian Webb verified buyer

    I have been using Bio.Me Prebio PHGG 225g, according to recommended dosage, for at least 6 weeks now. Previously I used Symprove for more than 5 years, having been diagnosed with chronic IBS around 4 years earlier and worked my way through different diets (including FODMAP which I found too challenging to stick to) and prescribed medication.

    Symprove controlled my symptoms such that on a good day, I only went to the toilet 3 times, which compared well to up to 9 times prior to discovering the product, but on a bad day, I could still go at least 6 times.

    Following a recommendation, I took the big decision to move to Bio.Me. I could not believe the difference it made in the first 2 days. I had not had what I would call a normal poo for many years, but that is what I had. The next 2 weeks were not quite as successful, but I think that was partly due to me testing the benefits of the product to the limit. For example, I love fruit and veg and decided to have large quantities once a day. This, as was previously the case, sent my intestine into over drive and I ended up with a very poorly tummy again.

    I am slowly learning not to indulge in such ways and am continuing to see the benefits of the product, evidenced by having more normal than abnormal bowel movement and less bloating.

    As a result, I have ordered more of this product and shall continue to keep it under review.

    The only reason for not giving it 5 stars is that I am not consistently symptom free, but I can honestly say that the results have been remarkable, nonetheless.

    Thanks to Jon, my gym trainer for sharing the information and intelligence about this product with me.

    • Invivo Support

      Thank you so much for taking the time to share your experience with us, Gillian. We are so thrilled to know PHGG has helped ease your symptoms and hope it continues to do so.

  5. Helen Ross verified healthcare provider verified buyer

    Wonderful product for any gut health issues!

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Nutritional Information
Ingredients: Sunfiber® R-O(Partially Hydrolysed Guar Gum) 5g

Mix 5g (1 tsp) daily into at least 200ml of water or other beverage of choice, or add to food.
Do not exceed the recommended dose, unless advised by your healthcare professional.

Suitable from 6 months

PHGG is normally well tolerated, but if you have a sensitive stomach, start with half a dose and build up gradually to the full dosage.

PHGG has been consumed by pregnant and lactating women for years, and it has been shown to be a safe way to improve regularity and reduce cramping and bloating. As with any supplement, however, please consult with your health care practitioner prior to use if you are pregnant or breastfeeding.


I am nervous about taking prebiotics as I get bloating and I am worried this will make it worse?

PHGG is a specially chosen prebiotic as it is well tolerated in the majority of people, unlike some other prebiotics like Fructooligosaccharides (FOS). However, all of our microbiomes are unique, so when trying to change your microbiome there may be some transient changes in bowel movements and abdominal sensations, none of which should be uncomfortable.  

In people with sensitive stomachs, we suggest starting with a lower dose and gradually increasing to the full dose over a number of weeks, so only the benefits are noticeable. 

What is the best way to take PHGG?
This product is best mixed into a hot beverage to help it to dissolve. It is heat stable so can be used in food and hot drinks where it dissolves easily. When adding PHGG to a hot beverage, it should be added to the beverage, not the other way around. Do not agitate (stir) it immediately as the more you leave it, the easier it dissolves. Avoid mixing into cold water as this may make it clump. PHGG is also great mixed into a smoothie and as a healthy addition to baking. Once opened, use within 2 months.
I'm using the teaspoon dosage but this differs from the gram dosage, which is correct?
There are a few factors in play here – powders can settle over time, the density may vary from batch to batch and though there is a standardised teaspoon size, home measuring equipment (such as scales) can have small variations.  The best way to ensure you are getting the correct dosage is to weigh your dosages as the products are standardised per gram.
Is Bio.Me Prebio PHGG suitable for use during pregnancy and breastfeeding?
PHGG has been consumed by pregnant and lactating women for years, and it has been shown to be a safe way to improve regularity and reduce cramping and bloating. As with any supplement, however, please consult with your health care practitioner prior to use if you are pregnant or breastfeeding.
Is Bio.Me Prebio PHGG suitable for somebody following a kosher diet?
All of the ingredients contained in Bio.Me Prebio PHGG are certified kosher.
What is the difference between PHGG and Guar Gum?
PHGG undergoes hydrolysis by enzyme, which is then inactivated by heat. This enables the bonds in the product to be accessible to microbes to use as fuel source.

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