In Short

There is absolutely no need to refrigerate any of the supplements in the OptiBac range.

At OptiBac, we carry out a number of steps in order to ensure a 'fridge-free technology'. Firstly, we select only the most robust strains within a species (find out more about our strains here.) After the strains are extracted from the culture, they are put through a process called lyophilisation; a safe, sophisticated form of freeze drying. The strains are then tested to ensure that they survive at room temperature, and to ensure that the billions count stated on the packaging is correct. The stated number of good bacteria in each supplement is valid right up until the expiry date.


You can put our supplements in the fridge, but there's no need.

Shelf stable

The entire OptiBac range is 'shelf-stable' (ie. can be kept on a shelf, and not in the fridge) for your convenience. So you can keep us in your handbag, on your desk at work, or on your bedside table - wherever you won't forget to take it! It is recommended to store our supplements in a cool and dry place and away from direct sunlight.

Incidentally, if you want to put your OptiBac supplements in the fridge, you can!

In Depth

The strength of a live culture is measured by the number of billion friendly bacteria per gram, capsule or sachet. At OptiBac we guarantee the strength of each of our products at the expiry date of the product. This benefits our customers because in order to deliver on the guarantee, our supplements are far more potent than stated, at the point of manufacture. Some other live cultures on the market only give their potency guarantee at the point of manufacture, meaning that by the time of expiry there will be fewer viable cultures than stated, due to the inevitable demise of a small percentage of bacteria during its shelf life.

All of our live cultures undergo stability testing, in order that we can calculate the additional billions count needed at manufacture, in order to satisfy our billions count guarantee at expiry. Below is a stability graph for ‘For babies & children’ (formerly called ‘For your child’s health’). The orange line marks the amount of microorganisms - this naturally drops slightly over time - but remains well above the 'specification', ie. 3 billion per sachet. As you can see, 4 different batches have been tested and the average has been taken, and the tests were conducted over 24 months, at 25 degrees Celsius (a higher temperature than the recommended storage in room temperature / a cool, dry place).

Stability of 'For babies & children' (formerly called 'For your child's health)

Our stability tests are performed at different temperatures to determine the robustness and shelf-life of the strains we use, but in general we are most interested to see how the bacteria survive at room temperatures or slightly higher (eg. 25 degrees C) just to be on the safe side! Some products in our range have been tested to higher temperatures than others, and still show excellent stability thanks to the robust nature of the high quality strains. For example, ‘For travelling abroad’ has not only been tested at higher temperatures, but also at higher humidity. This is of great importance to a travel product, that could potentially be taken to much warmer and more humid climates.

To read more about the tests on our products, see nutritional therapist Joanna's write up, 'Most probiotics don't live up to their claims? Well ours do!'

Non-refrigerated Vs Refrigerated

As long as friendly bacteria delivers the number of billions stated on the pack, and the strength is guaranteed at expiry rather than at manufacture, then it need not matter whether a supplement is kept in the fridge or at ambient temperature. We chose to create shelf-stable products for 2 main reasons. Firstly, we believe that they are more convenient for our customers and can fit more readily in to a busy lifestyle. It is not always practical to keep products in a fridge. Secondly, being shelf-stable means that we do not have to rely on retailers storing them at the correct temperature, or delivery drivers using chilled vans whilst the product is still in the supply chain. Whilst this may sound a bit extreme, we just want to be 100% sure that the product reaches you in perfect condition, and the best way to do this is to remove as many variables as possible!

For further reading around the topic and what is fact or myth, have a look at our Probiotic Myths ...BUSTED! pages.