The short answer · Migraine severity
Take riboflavin for migraine severity. This is the one to buy.

Nutricost, Vitamin B2, 400 mg, 120 Capsules
4.8· 1,533 ratings· $0.12/serving
Riboflavin 400 mg — inside the studied 400-400 mg window
Of 6,062 products scored for Migraine severity, Nutricost, Vitamin B2, 400 mg, 120 Capsules ranks #1 with a DoseRank score of 86. Riboflavin is the strongest evidence signal for this outcome.
Retailer links may be affiliate links. Rankings and placement are never paid.
The form“Why Riboflavin — not Magnesium Glycinate or Magnesium Citrate?”Evidence Strong evidence
Riboflavin is the strongest evidence signal for this outcome.
- RiboflavinThe pick
Strong evidence · 400 mg
Water-soluble vitamin B2 central to energy metabolism and antioxidant recycling; high doses around 400 mg/day are well established for migraine prevention.
- Magnesium Glycinate
Strong evidence · 500 mg
Magnesium chelated to glycine (the bisglycinate chelate); well-absorbed and gentle on digestion, a popular form for relaxation and sleep support.
- Magnesium Citrate
Moderate evidence · 450 mg
Well-absorbed magnesium bound to citric acid; more bioavailable than oxide but mildly laxative at higher doses — the common workhorse for general repletion.
The dose“Is the dose actually effective?”Dose fit 90
Riboflavin at 400 mg lands inside the studied 400-400 mg window.
Riboflavin
Studied window 400-400 mg · this pick 400 mg
The ranking“Why should I trust this pick?”Trust 82
Solid trust signals from buyer ratings, with room to grow. Each product gets a DoseRank score blending clinical strength, evidence, dose fit, trust and value. Retailer links may be affiliate links — the scoring model decides placement, never payment from a brand.
- 6,062 products scored
- Never paid placement
- Evidence level: Strong · 92
- 461 brands
- 19 ingredients
The price“Can I do better than $0.12 a serving?”Value 76
$0.12 per serving — mid price tier for this outcome. The cheapest ranked pick here is $0.11 per serving.
- 2Best Naturals, Vitamin B-2 (Riboflavin), 400 mg, 120 Vegetarian CapsulesScore 84 · $0.11/servingiHerb
Why not the absolute cheapest? The DoseRank score also weighs clinical strength, evidence, dose fit and trust — the very cheapest listings rarely hold up everywhere else.
Ready?
The #1 pick is $0.12 a serving.Nutricost, Vitamin B2, 400 mg, 120 Capsules — in stock at a tracked retailer.
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Nutricost, Vitamin B2, 400 mg, 120 Capsules ranks #1 for Migraine severity with a DoseRank score of 86. The score blends clinical strength, evidence, dose fit, trust signals and value across 6,062 products scored for this outcome.