The short answer · Pain intensity
Take dl-phenylalanine for pain intensity. This is the one to buy.

Nutra BioGenesis, Ultra Lean™ Appetite Control, 120 Capsules
4.2· 33 ratings· $1.47/serving
DL-Phenylalanine 1000 mg — inside the studied 1000-2500 mg window
Of 912 products scored for Pain intensity, Nutra BioGenesis, Ultra Lean™ Appetite Control, 120 Capsules ranks #1 with a DoseRank score of 36. Evidence is still thin for DL-Phenylalanine.
Retailer links may be affiliate links. Rankings and placement are never paid.
The form“Why DL-Phenylalanine — not Magnesium Malate?”Evidence Limited evidence
Evidence is still thin for DL-Phenylalanine.
- DL-PhenylalanineThe pick
Limited evidence · 1000 mg
Racemic mix of D- and L-phenylalanine; the L-form feeds dopamine and norepinephrine while the D-form may slow enkephalin breakdown, used for mood and pain.
- Magnesium Malate
Limited evidence · 500 mg
Magnesium chelated to malic acid, a Krebs-cycle intermediate; a well-tolerated form often chosen for energy support and muscle fatigue rather than as a laxative.
The dose“Is the dose actually effective?”Dose fit 67
Dose-range data is not available for this formula yet.
DL-Phenylalanine
Studied window 1000-2500 mg · this pick 1000 mg
The ranking“Why should I trust this pick?”Trust 36
Limited trust signals so far for this listing. 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.
- 912 products scored
- Never paid placement
- Evidence level: Limited · 60
- 167 brands
- 5 ingredients
The price“Can I do better than $1.47 a serving?”Value 20
$1.47 per serving — high price tier for this outcome. The cheapest ranked pick here is $0.15 per serving.
- 4Nutricost, Magnesium Malate, Unflavored, 10.7 oz (300 g)Score 24 · $0.15/servingiHerb
- 7Nature's Life, Renewing Magnesium Malate, 250 Tablets (200 mg per Tablet)Score 24 · $0.20/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 $1.47 a serving.Nutra BioGenesis, Ultra Lean™ Appetite Control, 120 Capsules — in stock at a tracked retailer.
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Nutra BioGenesis, Ultra Lean™ Appetite Control, 120 Capsules ranks #1 for Pain intensity with a DoseRank score of 36. The score blends clinical strength, evidence, dose fit, trust signals and value across 912 products scored for this outcome.
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