Top 5 — Ranked by Evidence
Moderate
NAC (N-Acetylcysteine)
Semen quality and ovulation support
600–1,800 mg/day in divided doses; respiratory: 600 mg twice daily; liver support: 60
Strong
Ashwagandha
Sperm Quality
KSM-66® root extract: 300-600 mg/day (most stress/sleep trials). Shoden®: 120-240 mg/
Limited
Maca
Semen Quality
1.5–3 g/day dried root powder; raw, gelatinised, yellow, red and black preparations are not interchangeable.
Moderate
Acetyl-L-Carnitine (ALCAR)
Sperm motility (combined with L-carnitine)
COGNITIVE/AGING: 1500-3000 mg/day divided. DIABETIC NEUROPATHY: 1000 mg × 3/day = 300
Moderate
L-Carnitine
Supports sperm motility in men with low sperm quality
General supplementation: 1-3 g/day L-carnitine. Athletic recovery: 2 g/day L-carnitin
📈 Fastest Growing Fertility Ingredients
Branded ingredients seeing rapid growth in formulator adoption and clinical research in 2024–2026.
Trending
Limited
Kaneka Ubiquinol™ (Reduced Coenzyme Q10)
Egg and sperm research
90 to 300 mg/day in a 4-week safety and absorption study; 150 mg/day for 12 weeks in a small…
Trending
Limited
PrimaVie® (Shilajit Extract — Natreon)
Sperm count and motility
250 mg twice a day (500 mg/day) for 90 days in the testosterone trial; 250 or 500 mg/day for 8…
Trending
Very Strong
Folate
Supports Preconception Health
RDA 400 mcg DFE/day for adults, 600 mcg DFE in pregnancy; 400 mcg/day folic acid advised…
🔬 Future Fertility Ingredients to Watch
Lower current evidence but active research underway — these may become top picks within 2–3 years.
Watch
Moderate
NAC (N-Acetylcysteine)
Semen quality and ovulation support
600 to 1,200 mg per day (600 mg once or twice daily) in lung and fertility trials; 2,000 to…
Watch
Moderate
Shatavari (Asparagus racemosus / Xeya®)
Supports healthy ovarian structure and androgen balance
Lactation: 300 mg root extract twice daily for 72 hours after delivery. PCOS: 100 mg CL22209…
Watch
Moderate
L-Carnitine
Supports sperm motility in men with low sperm quality
Glucose and HbA1c effects were larger at 2 g/day or more for 12 weeks or longer. The…
Recommended Fertility Products
Heads up: NutraSmarts may earn a commission from purchases made through these links, at no extra cost to you. We curate these picks based on the same evidence we cite throughout the page. Full disclosure.
Real products featuring the best-evidenced fertility ingredients ranked above - chosen for clinically-studied forms and doses, third-party testing, and value. Match the supplement to your specific need.
Best for preconception foundational nutrients
Amazon →
Garden of Life mykind Organics Prenatal Multi
Whole-food multi w/ methylfolate + D3, 90 tablets
Organic whole-food prenatal supplying folate (not folic acid), iron and D3; certified organic, non-GMO, vegan.
Best for the absorbable ubiquinol form
Amazon →
Life Extension Super Ubiquinol CoQ10
100 mg ubiquinol softgels, 60 ct
Provides the reduced ubiquinol form of CoQ10 that is often easier to absorb, from a tested, well-formulated brand.
Best for reproductive-health zinc support
Amazon →
Thorne Zinc Picolinate 30 mg
30 mg zinc picolinate capsules, 60 ct
Well-absorbed picolinate form supporting normal reproductive health; third-party certified, free of gluten/dairy/soy.
Best for antioxidant & glutathione support
Amazon →
NOW Supplements NAC 600 mg
600 mg w/ selenium & molybdenum veg caps, 100 ct
NAC is a precursor the body uses to make glutathione; adds selenium and molybdenum from a value-priced brand.
All Fertility Ingredients (7)
Moderate
NAC (N-Acetylcysteine)
Semen quality and ovulation support
600–1,800 mg/day in divided doses; respiratory: 600 mg twice daily; liver support: 60
Strong
Ashwagandha
Sperm Quality
KSM-66® root extract: 300-600 mg/day (most stress/sleep trials). Shoden®: 120-240 mg/
Limited
Maca
Semen Quality
1.5–3 g/day dried root powder; raw, gelatinised, yellow, red and black preparations are not interchangeable.
Moderate
Acetyl-L-Carnitine (ALCAR)
Sperm motility (combined with L-carnitine)
COGNITIVE/AGING: 1500-3000 mg/day divided. DIABETIC NEUROPATHY: 1000 mg × 3/day = 300
Moderate
L-Carnitine
Supports sperm motility in men with low sperm quality
General supplementation: 1-3 g/day L-carnitine. Athletic recovery: 2 g/day L-carnitin
Limited
PrimaVie® (Shilajit Extract — Natreon)
Sperm count and motility
Clinical trial dose: 250 mg twice daily (500 mg/day total) for 90 days. CoQ10 potenti
Limited
Safed Musli (Chlorophytum borivilianum)
Semen volume and sperm count in one 30-man trial of healthy men
TRADITIONAL AYURVEDIC: 5-10 g root powder/day with milk. CAPSULE EXTRACTS: 250-500 mg