If you use my link, you get 50% off your first 3 months of a Symprove flexi subscription.
A flexi subscription is usually £49.99 per month so this reduces it to £25 and there's no minimum term so you can cancel at any time. This is a real bargain as even the 12 month subscription (their cheapest which I have) is £39.99 a month. I wish they'd offered this deal when I joined!
Symprove is one of only two probiotic supplements recommended by GPs (the other one being VSL).
symprove.mention-me.com/m/ol/mi9ir-justine-bibby
For full disclosure, I get a referral fee of £20 (so reduces my own subscription fee as a one-off) for anyone who signs up via my link to get the 3 months 50% discount (saving themselves up to £75).
I've been using Symprove for 2 years now and I noticed a big difference within my first 2 months.