Reduce daytime sleepiness

What this outcome means

Daytime sleepiness is the heavy pull toward dozing off or fading alertness when you should feel awake and engaged. On DoseRank it maps to a defined health outcome built from human studies on Epworth sleepiness scores, sustained alertness, and reaction time – data sourced from open sources and specialized resources. DoseRank is not medical advice.

Who it's for

Afternoon crashA mid-day slump where focus and energy drop off sharply.

Behind the wheelFighting to stay alert on long or monotonous drives.

Shift workersIrregular hours that leave you drowsy at the wrong times.

Stack buildersAlready taking supplements such as Glycine or L-Tryptophan and want the dose right.

Evidence level

78Moderate-strong

Glycine – has moderate public evidence for this outcome. This usually means there are smaller or mechanistic studies, but not randomized human trials. A DoseFit Score of 96 means this product's ingredient forms and doses are close to what was used in the studies behind this ranking - DoseRank weights each product ingredient.

Best available ingredients

Glycine leads this outcome, supported by L-Tryptophan.

Dose matchedDoseFit 96

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: Above range: Glycine 18950 mg vs 3-5 mg; Below range: L-Tryptophan 384 mg vs 2000-6000 mg.

Thin spots

L-Tryptophan has low evidence for this outcome, so it is flagged as an evidence gap rather than treated as a proven driver.

Processed

1.6k

Available

1.6k

Ingredients

Brands

245

Coverage

100%

How to read the scores

What every metric means

Each score is 0–100. Higher is better for every metric below.

CompositeThe overall DoseRank score — a weighted blend of clinical strength, evidence, dose fit, trust and value.Higher is better

ClinicalHow strongly the formula's ingredients and doses match what clinical studies used for this outcome.Higher is better

EvidenceHow much published human research backs the formula's key ingredients for this outcome — both how many studies exist and how strong they are.Higher is better

ValueHow the price per serving compares with similar products for this outcome — 50 is the typical price, higher means better value for your money.Higher is better

TrustHow well customers rate this product, with extra weight given to ratings backed by a large number of reviews.Higher is better

PopularityHow strongly this product sells compared with the other ranked products for this outcome.Higher is better

This legend covers the scores on this page — for data sources, scoring weights, and limits, read the full methodology →

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Questions

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Each product gets a composite score blending clinical strength, evidence, dose fit, trust and value. The #1 on the DoseRank tab has the highest composite; the other tabs re-rank the same products by Value, Trust, or Popularity. Placement is never paid.

Reduce daytime sleepiness

What this outcome means

Who it's for

Afternoon crashA mid-day slump where focus and energy drop off sharply.

Behind the wheelFighting to stay alert on long or monotonous drives.

Shift workersIrregular hours that leave you drowsy at the wrong times.

Stack buildersAlready taking supplements such as Glycine or L-Tryptophan and want the dose right.

Evidence level

78Moderate-strong

Best available ingredients

Glycine leads this outcome, supported by L-Tryptophan.

Dose matchedDoseFit 96

Scores reward products dosed inside or above the studied range, not just the right ingredient. Examples: Above range: Glycine 18950 mg vs 3-5 mg; Below range: L-Tryptophan 384 mg vs 2000-6000 mg.

Thin spots

L-Tryptophan has low evidence for this outcome, so it is flagged as an evidence gap rather than treated as a proven driver.

Processed

1.6k

Available

1.6k

Ingredients

Brands

245

Coverage

100%

Top decision cards

Best products for daytime sleepiness

Ranking by · Composite outcome score

Best overall — the composite outcome score.

Top pick · DoseRank

Why this ranks #1 for daytime sleepiness

MuscleMeds, Carnivor Beef Aminos, 100% Pure Beef Protein, 300 Tablets

MuscleMeds$0.22 / serving4.7 · 639Available now

Why this ranks here

Evidence fitGlycine has moderate human evidence for this outcome.
Dose fitGlycine at 18950 mg is higher than the studied 3-5 g window.
Price / serving$0.22 per serving — mid price tier for this outcome.
AvailabilityIn stock across major retailers; 99% availability confidence.
TrustMixed trust signals — ratings are positive but the base is limited.

Trade-offs

Trust signals sit below the other picksPopularity trails the other picks here

The numbers

18950 mgAbove rangehigher than the studied 3-5 g window

384 mgThin evidenceevidence for this ingredient is still thin

Compare top 3 Product data Open at retailer

The rest of the ranking · DoseRank

Top 10 ranked products