Head-to-Head · 2026
Nutrition Geeks Vitamin D 4000iu Max Strength vs Nutrition Geeks Ashwagandha Calm+
We score both vitamins 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
Nutrition Geeks Vitamin D 4000iu Max Strength wins on Effectiveness Match with 91/100.
Best value per serving: Nutrition Geeks Vitamin D 4000iu Max Strength at £0.02/serving (score 91).
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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.