I have used this and I know it’s popular among the podcast, so I thought there might be some interest to see this article. Looks like knock-offs are a pretty good alternative.
Wonder if we could get the official non-official TR knock off recipe 
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Thanks for the link, I’ll have a read of that later.
For what it’s worth I’ve used Maurten gels in my last two marathons and felt great taking them every 7km or so. However the new coffee gels are way different and I know a few people who’s Berlin marathon was badly effected by these.