# Serious Mass - Optimum Nutrition

**Category:** Sport & fitness
**Code (GTIN/SKU):** 5060245607650
**Canonical URL:** https://openreviews.io/en/reviews/p/serious-mass-optimum-nutrition-5060245607650

## Rating: 4.8/5 ★★★★★ — 266 reviews analyzed
_Confidence: high_

## At a glance

Serious Mass - Optimum Nutrition reviews: 4.8/5 based on 266 analyzed reviews from 2 sites, updated October 26, 2026.

Praised: weight gain and manufacturing quality.

266 reviews analyzed, all published on other sites.
Other sites: 2 sources, 266 reviews, average rating 4.8/5.
How we count reviews: https://openreviews.io/en/methodology

## AI summary

This dietary supplement is specially designed to support individuals looking to increase their daily caloric intake and gain muscle mass. Users unanimously highlight its remarkable effectiveness for rapid and progressive weight gain. The brand's reputation is confirmed through the overall quality of this product's formulation.

## Strengths

- **Weight gain** — The product proves to be particularly effective in helping to significantly increase body volume and weight.
- **Manufacturing quality** — The formulation benefits from the recognized expertise and quality of the Optimum Nutrition brand.

## Frequently asked questions

- How effective is it for mass gain?
- Is the Optimum Nutrition brand reliable?
- Is this product suitable for beginners?
- How is the quality of the formulation?

---
_Source: OpenReviews — https://openreviews.io/en/reviews/p/serious-mass-optimum-nutrition-5060245607650_