The short answer · Sperm motility
Take acetyl-l-carnitine & coq10 for sperm motility. This is the one to buy.
Natural Factors, Regener Life™, 2.86 oz (81 g)
4.8· 431 ratings· $1.26/serving
Acetyl-L-Carnitine 1500 mg — inside the studied 1000-3000 mg window
Of 3,185 products scored for Sperm motility, Natural Factors, Regener Life™, 2.86 oz (81 g) ranks #1 with a DoseRank score of 86. Acetyl-L-Carnitine and CoQ10 have moderate human evidence for this outcome.
Retailer links may be affiliate links. Rankings and placement are never paid.
The form“Why Acetyl-L-Carnitine & CoQ10?”Evidence Moderate evidence
Acetyl-L-Carnitine and CoQ10 have moderate human evidence for this outcome.
- Acetyl-L-CarnitineThe pick
Moderate evidence · 1500 mg
Acetylated L-carnitine that crosses the blood-brain barrier; supports mitochondrial energy and has the strongest evidence among carnitine forms for cognitive benefit.
- CoQ10The pick
Moderate evidence · 300 mg
Lipid-soluble antioxidant synthesized in every cell; fuels mitochondrial ATP production and is often depleted by statins — ubiquinol form absorbs better in older adults.
- L-Carnitine L-Tartrate
Moderate evidence · 2000 mg
L-carnitine bound to tartrate for faster absorption; studied for exercise recovery and shuttling fatty acids into mitochondria for energy.
The dose“Is the dose actually effective?”Dose fit 75
2 of 2 dosed ingredients land in the studied range. Acetyl-L-Carnitine at 1500 mg lands inside the studied 1000-3000 mg window.
Acetyl-L-Carnitine
Studied window 1000-3000 mg · this pick 1500 mg
CoQ10
Studied window 200-400 mg · this pick 300 mg
The ranking“Why should I trust this pick?”Trust 68
Mixed trust signals — ratings are positive but the base is limited. 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.
- 3,185 products scored
- Never paid placement
- Evidence level: Moderate · 78
- 296 brands
- 20 ingredients
The price“Can I do better than $1.26 a serving?”Value 35
$1.26 per serving — high price tier for this outcome. The cheapest ranked pick here is $0.28 per serving.
- 3NOW Foods, Acetyl-L-Carnitine, 500 mg, 200 Veg CapsulesScore 84 · $0.28/servingiHerb
- 9Qunol, Mega CoQ10 Ubiquinol, 100 mg, 100 SoftgelsScore 82 · $0.30/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 $1.26 a serving.Natural Factors, Regener Life™, 2.86 oz (81 g) — in stock at a tracked retailer.
View on iHerbA saved, shareable breakdown: your matched products, dose math, and interaction flags to discuss with a clinician.
Or take the 60-sec quiz →Questions
Frequently asked
Natural Factors, Regener Life™, 2.86 oz (81 g) ranks #1 for Sperm motility with a DoseRank score of 86. The score blends clinical strength, evidence, dose fit, trust signals and value across 3,185 products scored for this outcome.
Keep exploring