The company, which is based in Stokesley, is building a third fermenter at its site in Billingham to increase production by up to 50%.
The deal will create about 100 new jobs during construction then a further 300 to operate the facility.
Stockton North Labour MP Alex Cunningham said it was "tremendous good news" for local people.
The company employs about 600 people and exports to 13 countries around the world including Australia and the USA.

Crews have been tackling the smouldering fires involving 3,000 tonnes of woodchip at South Wales Wood Recycling in Coity since last Monday.
Public health officials had advised nearby residents to keep doors and windows closed while the fire was burning.
The fire service said it was continuing to liaise with on-site management.
South Wales Fire and Rescue Service said Natural Resources Wales officials were also monitoring the situation.
About 400 jobs are to be created across Teesside and North Yorkshire thanks to £30m of investment from Quorn Foods.
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A blaze at a wood recycling centre in Bridgend has finally been extinguished after burning for nearly a week.