Why Feyv?


Not all supplements are created equal — and we believe you deserve better.

Most gummies stop short. Feyv goes further.

The supplement aisle is crowded with creatine products — but most don’t deliver what your body truly needs. Many creatine gummies contain only 1–3 grams of creatine, fall short of clinical dosing, or skip independent testing altogether. At Feyv, we designed a product that is not just effective for today, but sustainable for decades to come.

Clinically Effective Dose

Each serving of Feyv provides 5 g of creatine monohydrate — the same dose repeatedly validated in research to improve muscle strength, power, and recovery. Lesser doses may look appealing on a label, but they don’t deliver the results proven in clinical studies. We didn’t compromise, because your long-term health isn’t negotiable.

Longevity First: Muscle, Bone, Brain

Feyv isn’t just about the gym — it’s about aging well. After your 30s, adults lose 3–8% of muscle mass per decade, and in older adults this accelerates into a clinical condition called sarcopenia. Sarcopenia is directly linked to weakness, frailty, falls, fractures, and loss of independence.

That’s why we paired creatine with 25 mcg (1,000 IU) of vitamin D3 in every serving:

  • Muscle: Creatine preserves strength, reduces fatigue, and supports mobility.

  • Bone: Vitamin D3 promotes bone density and reduces fracture risk.

  • Brain: Creatine has been shown to support cognitive performance and resilience under stress.

Together, creatine and vitamin D3 form a daily foundation for staying strong, sharp, and independent as you age.

Purity You Can Prove

Not all creatine is created equal. Many supplements on the market are white-labeled powders or gummies sourced from bulk suppliers with little oversight. Independent analyses have shown that some creatine products contained detectable levels of lead, arsenic, and cadmium — heavy metals that can accumulate in the body and cause long-term harm.¹

At Feyv, we only use Creapure® creatine monohydrate — the gold standard of purity, produced in Germany under strict quality controls and batch-tested with Certificates of Analysis (COAs).

That means:

  • No fillers

  • No impurities

  • No guesswork

You’ll see our testing data because transparency isn’t optional — it’s part of performance.

Designed by Doctors, Not Marketers

Most supplement companies are built on flashy marketing. Feyv is built on evidence. As physicians, we created Feyv because we saw a gap: adults at risk of muscle and bone loss had no supplement they could trust to deliver clinical doses, proven ingredients, and long-term safety.

Every jar reflects our belief that what you put in your body matters — and that supplements should serve your health today and decades from now.

Feyv = Strength for the Long Run

Our mission isn’t short-term hype. It’s helping you fight sarcopenia, maintain bone density, and support brain health — so you can stay strong, active, and independent for years to come.

References

  1. Clean Label Project. Protein Powder Contaminant Testing. https://cleanlabelproject.org/protein-powder/

  2. Patrick L. Lead toxicity, a review of the literature. Part 1: exposure, evaluation, and treatment. Altern Med Rev. 2006;11(1):2-22.

  3. Järup L, Åkesson A. Current status of cadmium as an environmental health problem. Toxicol Appl Pharmacol. 2009;238(3):201-208.

  4. Cruz-Jentoft AJ, et al. Sarcopenia: revised European consensus on definition and diagnosis. Age Ageing. 2019;48(1):16-31.

  5. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18.

  6. Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357:266–281.