Brand Showdown · 2026
Bulk vs Optimum Nutrition
We score every Bulk and Optimum Nutrition product against the same evidence-based clinical reference, so you can see which brand doses better, ranges wider and costs less per effective serving — judged on what is in the tub, never reputation or marketing.
Verdict
Bulk edges it on average Effectiveness Match (80 vs 66) across the products we score.
Better value per serving: Bulk at £0.63/serving on average.
Bulk
★ Higher avg
Category head-to-head
Where both brands compete, here is each one's top-scoring pick.
Whey
Whey Isolate
Creatine
Post-Workout
Hydration
How we score
Every product earns an Effectiveness Match score (0–100) measuring how closely its active ingredient doses match the evidence-based clinical reference for its category. Brand averages are taken across the products we score, so a brand is rewarded for consistently dosing well — not for one hero product. 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.