Optibac One Week Flat - 7 Sachets

7 UNI | £1.43 per 1UNI

3 for 2 on selected vitamins and supplements - cheapest free


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Live cultures food supplement - 7 sachets

An easy, short-term friendly bacteria supplement. Contains high quality strains tested and shown to survive to reach the gut alive. Scientifically proven friendly bacteria to be taken for 7 consecutive days. 

  • Vegan
  • Gluten free
  • Flavourless

Suitable for

Suitable from 4 years +

How to use

Suitable from 4 years+. Take one sachet daily for 7 consecutive days, preferably with breakfast. Shake sachet, gradually sprinkle contents into a glass of water and vigorously swirl to dissolve fully. Can be taken occasionally (e.g. monthly), or on an ongoing basis. Also available in 28 sachets.

Hazards and Cautions

Food Supplements are intended to supplement the diet and should not be substituted for a varied diet or healthy lifestyle.

While every care has been taken to ensure this information is always as accurate as possible, food products are regularly improved and nutrition content may occasionally change. As a result we recommend that you always read the label carefully before using or consuming any products. Nutritional Reference Value (NRV) information is based on the typical composition of the product. Guideline daily amounts are those for a typical adult (men and women).NRV information for non Boots products is calculated by the manufacturer. Boots has no control over the recipe or nutritional content of such products and information on this site may differ to that given on the product label. We would therefore recommend you do not solely rely on this information and always read the product label. If you have any queries, or you would like advice on Boots products please contact our friendly Customer care team on 0345 609 0055.

This information was last updated 19/10/2022

Do not exceed recommended daily dosage. Food supplements should not be used as a substitute for a healthy and varied diet. Those with serious medical conditions should consult a doctor before use.


Check base of pack for Best Before date. No refrigeration necessary when stored in a cool, dry place below 25°C. 

Keep out of the sight and reach of children.

Important info

Country of origin: UK

Manufacturers address: Wren Laboratories Ltd, UK Headquarters, 21-22 Mayfield Avenue Industrial Park, Andover, SP11 8HU.


Ingredients per sachet - 5 billion live cultures (5 x 10)

Maltodextrin (natural source): Fructooligosaccharides (FOS 0.3g); Live cultures: Bifdobacterium bifidum Rosell-71, Lactobacillus casei Rose-215, Lactococcus lactis Rosell-1058 and Lactobacillus acidophilus/helveticus Rose-52.

Allergy advice: Please see ingredients in bold. more less

Delivery options

Click & Collect
£1.50 or free if you spend £15 or more from your choice of 2,200 stores.

Standard Delivery
£3.75 or free when you spend £25 or more.

Next Day Delivery
Order by 10pm (subject to change during promotions), available 7 days a week for £4.95. This may not be available during public holidays or weekends in between public holidays. Usually delivered between 8am and 9pm. The earliest delivery date for these orders will be shown at the checkout.

Named Day Delivery
£3.95 - choose a weekday within the next 14 days for delivery.

For more information see our delivery help or view our returns policy.