T-REDLINE™ - Natural Testosterone Booster - 120 Capsules, 30-Day Supply

The Only Clinically-Backed, Natural Testosterone Support You’ll Ever Need

Testosterone drives far more than just muscles and libido—it’s the biological engine behind your energy, focus, strength, resilience, and confidence.

T-REDLINE™ is designed to fuel every one of these critical systems.

  • Boost results from your workouts
  • Maintain consistent, all-day energy levels
  • Enhance libido and masculine drive
  • Elevate semen quality and reproductive health
  • Improve sleep quality for better recovery
  • Support a healthy, efficient metabolism
  • Boost resilience to stress and cortisol
  • Sharpen focus and decision-making
Sale price$89.95
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2-3 Business Days Delivery

UK & EU & AU & Canada

3-6 Business Days Delivery (Ships From USA)

U.S. Nutritional Scientist Formulated

Partnered With Leading Researchers & Institutions

Third-Party Lab Tested

U.S. Independent Lab Test For Purity and Toxins

Made in USA

Manufactured in FDA-Registered and Audited Facility

60 Day Money-Back Guarantee

Results or We Make It Right. No Excuses.

Relentless

In Pursuit of Science-Backed Solutions for Peak Masculinity

For the Few Who Never Settle

Welcome to the MANFUELED Brotherhood.
Here to Push You Further—and See You Win

16,000+ Daily Users

150+ clinical studies

supporting ingredients efficacy

100%

natural ingredients

$2

per day investment in your health

Testosterone Decline is REAL. T-REDLINE made me realize how much low testosterone was holding me back. I feel stronger, more energized, and like my confident self again.

~Tyler K., 54

173% Testosterone Increase*

Across multiple biological pathways — clinically validated in men with low baseline levels.

138% Strength Increase*

Documented improvement in bench press performance during resistance training.

91% Libido Improvement*

Measured gains in sexual desire and performance in clinical research.

*Based on clinical studies of individual ingredients. Results may vary. Men with lower baseline testosterone experienced the greatest improvements.

Clinically Studied & Proven:

Tongkat Ali

  • Robust clinical backing from over 30 studies
  • Boosts free testosterone by up to 46%¹
  • Reduces cortisol by 16% for improved hormonal balance under stress¹
  • Enhances libido, muscle strength, and mood in aging men²
  • Clinically shown to raise testosterone levels in men with low T over 6 months³

Clinically Studied & Proven:

Ashwagandha

  • Backed by over 40 clinical studies.
  • Up to 32% increase in testosterone in 90 days⁴
  • 15% boost in testosterone and 138% increase in strength in 8 weeks⁵
  • Lowers cortisol by up to 27.9%, reducing stress and improving focus⁶
  • Improves sexual well-being and vitality in healthy adult men⁷
  • Clinically validated for stress and anxiety reduction⁸

Clinically Studied & Proven:

Fadogia Agrestis

  • Increases libido and sexual behavior in preclinical trials¹⁰
  • Stimulates luteinizing hormone (LH) to promote natural testosterone production⁹
  • Supports muscle growth via ecdysteroid pathways¹¹

Clinically Studied & Proven:

Core Synergists

  • Science-backed support nutrients for full hormonal optimization
  • Boron → Increases free testosterone by 28% in 7 days while lowering estrogen by 39%¹²
  • Vitamin D3 → Raises testosterone by 25% in vitamin D-deficient men¹⁴
  • Zinc → Shown to restore testosterone levels up to 24% in men with deficiency¹⁶ ¹⁷
  • Magnesium → Boosts testosterone availability and improves recovery and sleep¹⁹ ²⁰
Real strength comes from rising stronger after every fall.

Trusted by Over 16,000+ Men

Mike, 38

  • "This is the first male supplement that actually delivered. Energy and focus? Next level."

Joshua, 44

"T-REDLINE changed the game for me. More energy, better workouts, and my confidence is back."

John, 42

"My energy’s through the roof, and I feel unstoppable."

Your Questions Answered

Customer Reviews

Based on 124 reviews
67%
(83)
24%
(30)
7%
(9)
0%
(0)
2%
(2)
D
Daniel P.
raised my hormone levels

raised my testosterone levels

T
Thomas H.
Dream enhancement

Take before bedtime for vivid dreams.Take 2 one hour before gym.Feel stronger for a few hours.

D
Daniel H.
Does what it says

Very potent, this product works.

M
Michael B.
Works for Me

Gave me that bust of energy that I was looking for.

C
Chris P.
2nd Order Of This Supplement

Seems to a reliable supplement and company. 5

Scientific References

  1. Talbott, S.M., et al. (2013). Tongkat Ali increased testosterone by 37% and reduced cortisol by 16% in stressed men over 4 weeks. Journal of the International Society of Sports Nutrition, 10(1), 28.
    https://jissn.biomedcentral.com/articles/10.1186/1550-2783-10-28

  2. Henkel, R.R., et al. (2014). Tongkat Ali improved libido, strength, and mood in older adults. Phytotherapy Research, 28(4), 544–550.
    https://pubmed.ncbi.nlm.nih.gov/23512278

  3. Ismail, S.B., et al. (2020). 6-month Tongkat Ali trial increased testosterone in men with late-onset hypogonadism. Maturitas, 135, 104–110.
    https://www.sciencedirect.com/science/article/abs/pii/S0378512220304497

  4. Ambiye, V.R., et al. (2013). Ashwagandha led to a 32% increase in serum testosterone. Evidence-Based Complementary and Alternative Medicine, 2013, 571420.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4266739

  5. Wankhede, S., et al. (2015). KSM-66® Ashwagandha boosted testosterone by 15% and strength by 138% in 8 weeks. JISSN, 12, 43.
    https://jissn.biomedcentral.com/articles/10.1186/s12970-015-0104-9

  6. Lopresti, A.L., et al. (2019). Ashwagandha reduced cortisol by 27.9%. Medicine (Baltimore), 98(37), e17186.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6750294

  7. Ahmad, M.K., et al. (2022). Ashwagandha improved sexual well-being and increased testosterone in healthy men. Health Science Reports, 5(4), e741.
    https://onlinelibrary.wiley.com/doi/10.1002/hsr2.741

  8. Lopresti, A.L., & Drummond, P.D. (2015). Ashwagandha improved stress and anxiety. Journal of Ethnopharmacology, 174, 89–96.
    https://www.sciencedirect.com/science/article/abs/pii/S0378874115300335

  9. Yakubu, M.T., et al. (2005). Fadogia Agrestis increased testosterone and libido in rats. Asian Journal of Andrology, 7(4), 399–404.
    https://pubmed.ncbi.nlm.nih.gov/16065397

  10. Oluyemi, J.A., et al. (2007). Fadogia extract boosted testosterone and sexual behavior in animal trials. International Journal of Pharmacology, 3(6), 574–577.
    https://pubmed.ncbi.nlm.nih.gov/16281088

  11. Slama, T.G., et al. (2021). Plant ecdysteroids (in Fadogia) show anabolic effects. Biomedicines, 9(5), 492.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8144247

  12. Naghii, M.R., et al. (2011). Boron increased free testosterone by 28% and lowered estrogen by 39% in 7 days. Journal of Trace Elements in Medicine and Biology, 25(1), 54–58.
    https://www.sciencedirect.com/science/article/abs/pii/S0946672X10001148

  13. Pizzorno, L. (2015). Comprehensive review on boron’s effect on testosterone and inflammation. Integrative Medicine, 14(4), 35–48.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4712861

  14. Pilz, S., et al. (2011). Vitamin D supplementation increased testosterone by 25% in 12 months. Hormone and Metabolic Research, 43(3), 223–225.
    https://pubmed.ncbi.nlm.nih.gov/21154195

  15. Nimptsch, K., et al. (2012). Positive correlation between vitamin D and testosterone levels. Clinical Endocrinology, 77(1), 106–112.
    https://pubmed.ncbi.nlm.nih.gov/22093177

  16. Netter, A., et al. (1992). Zinc restored testosterone and improved sperm count. Archives of Andrology, 28(1), 15–22.
    https://pubmed.ncbi.nlm.nih.gov/1553893

  17. Kilic, M. (2007). Zinc supplementation protected T levels post-exercise. Neuro Endocrinology Letters, 28(5), 681–685.
    https://pubmed.ncbi.nlm.nih.gov/17984965

  18. Fallah, A., et al. (2022). Meta-analysis confirmed serum zinc correlates with testosterone. J Trace Elem Med Biol, 69, 126889.
    https://www.sciencedirect.com/science/article/abs/pii/S0946672X22002048

  19. Cinar, V., et al. (2011). Magnesium increased free testosterone in both sedentary and active men. Biological Trace Element Research, 140(1), 18–23.
    https://pubmed.ncbi.nlm.nih.gov/20190350

  20. Maggio, M., et al. (2014). Magnesium and testosterone interplay impacts physical performance. International Journal of Endocrinology, 2014, 525249.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3912660

  21. Rantala, M.J., et al. (2013). Women preferred the scent of high-testosterone men during ovulation. Royal Society B: Biological Sciences.
    https://royalsocietypublishing.org/doi/10.1098/rspb.2013.0660

  22. Zinc meta-analysis, Scientific Reports (2016). Zinc levels in seminal plasma correlated with male fertility. https://doi.org/10.1038/srep22386