Head-to-Head · 2026
USN Muscle Fuel Anabolic vs Optimum Nutrition Serious Mass
We score both post-workout products against the same evidence-based clinical reference, so you can see exactly how their active doses, true cost per serving and Effectiveness Match scores stack up — never brand reputation or marketing.
Verdict
USN Muscle Fuel Anabolic and Optimum Nutrition Serious Mass are level on Effectiveness Match (94 each).
Best value per serving: USN Muscle Fuel Anabolic at £1.62/serving (score 94).
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How we score
Each product earns an Effectiveness Match score (0–100) measuring how closely its active ingredient doses match the evidence-based clinical reference for its category. Proprietary blends and amino-spiked formulas are penalised because they hide the real dose. We are independent — scores are never influenced by brands or affiliate deals.
Informational only — not medical advice. Buy links are affiliate links; we may earn a commission at no extra cost to you. This never affects scoring.