# Serious Mass - Optimum Nutrition

**Category:** Sport & fitness
**Code (GTIN/SKU):** 5060245601061
**Canonical URL:** https://openreviews.io/en/reviews/p/serious-mass-optimum-nutrition-5060245601061

## Rating: 4.8/5 ★★★★★ — 259 reviews analyzed
_Confidence: high_

## At a glance

Serious Mass - Optimum Nutrition reviews: 4.8/5 based on 259 analyzed reviews from 2 sites, updated October 26, 2026.

Praised: overall effectiveness.

259 reviews analyzed, all published on other sites.
Other sites: 2 sources, 259 reviews, average rating 4.8/5.
How we count reviews: https://openreviews.io/en/methodology

## AI summary

This gainer is a mass-building formula highly appreciated by users for its effectiveness. Customer feedback highlights excellent results in supporting muscle development and daily calorie intake.

## Strengths

- **Overall effectiveness** — This product receives excellent feedback regarding its effectiveness for weight gain.

## Frequently asked questions

- Is this gainer easy to mix?
- What flavors are available?
- Is this product easy to digest?
- How many calories does one serving provide?

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_Source: OpenReviews — https://openreviews.io/en/reviews/p/serious-mass-optimum-nutrition-5060245601061_