Certification status
Informed Sport
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Optimum Nutrition Serious Mass - Elite Series
Serious Mass is Optimum Nutrition's high-calorie weight gainer; the Elite Series carries Informed Sport certification, with every batch tested against the banned-substances list. A protein-and-carbohydrate powder for hard gainers. Sold direct from Optimum Nutrition at £44, rated 4.5 from over 500 reviews.
Buy in the UK
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Why this certification matters
- Informed Sport
- Informed Sport certification is especially relevant for athletes in tested sports because products are batch-tested for substances prohibited in sport.
Frequently asked questions
- What is Serious Mass?
- A high-calorie weight-gainer powder combining protein with a large carbohydrate load, for those wanting to gain weight.
- Why the Elite Series?
- It's the Informed Sport-certified version, batch-tested against banned substances for competing athletes.
- Who should use a mass gainer?
- People who can't eat enough whole food to gain weight. It's very calorie-dense.
- Where can I buy it?
- Direct from Optimum Nutrition at £44.
