Boost arrived in 1985 with a simple pitch: a chocolate bar with enough biscuit and caramel in it to actually fill you up, not just satisfy a sweet craving.
Launched by Cadbury in 1985
Cadbury introduced Boost in 1985 as a denser, more substantial alternative to its existing chocolate bars. Where Dairy Milk and Picnic leaned on smoothness or crunch from nuts, Boost was built around a thick biscuit base layered with caramel, aimed at shoppers who wanted something closer to a proper snack than a treat.
What's In A Boost Bar
- Biscuit — a dense, crunchy base that runs the length of the bar.
- Caramel — a soft caramel layer sitting on top of the biscuit.
- Milk chocolate — the full Cadbury milk chocolate coating.
The biscuit-caramel-chocolate combination put Boost in similar territory to bars like Breakaway and Trio, but its thicker format and heavier caramel content gave it a more filling, indulgent character than its biscuit-bar rivals.
Boost Glucose and the Wider Range
Cadbury later extended the name into Boost Glucose, a bar specifically marketed as an energy source for people doing physical work — a positioning that echoes old-fashioned "glucose" energy bars aimed at manual labourers and outdoor workers. Boost has also appeared in bite-sized multipack formats and limited flavour variants over the years, but the original biscuit-and-caramel bar has remained the mainstay of the range.
Boost Today
Boost is still made by Cadbury, part of Mondelez International, and remains one of the better-selling bars in the UK chocolate category nearly four decades after launch — a rare example of an '80s newcomer that never left shelves.
Frequently asked questions
When did Cadbury launch Boost?
Cadbury launched Boost in 1985. It was built around a crunchy biscuit and caramel centre coated in milk chocolate, positioned as a heartier, more filling bar than Cadbury's existing range.
What is inside a Boost bar?
A Boost bar has a crisp biscuit layer and a caramel filling, coated in Cadbury milk chocolate. The biscuit gives it a denser, crunchier texture than a standard chocolate bar.
Is Boost still sold today?
Yes. Boost remains in production and is widely available in the UK, alongside spin-offs such as Boost Glucose, which is marketed as an energy bar for manual and outdoor workers.