HorseFil Reviews evaluate a men’s vitality gummy as 2025 meta-analysis of 26 RCTs confirms Rhodiola improves VO2 max
By the Health & Science Desk | NEW YORK, NY — July 24, 2026 — A September 2025 systematic review and meta-analysis published in Frontiers in Nutrition evaluated 26 randomised controlled trials on Rhodiola rosea and found significant improvements in VO2 max, time to exhaustion, and time trial performance across 668 healthy participants (Wang et al., doi: 10.3389/fnut.2025.1645346). HorseFil, a once-daily gummy supplement sold through the official website and manufactured in the United States, lists Rhodiola alongside L-Citrulline, L-Carnitine, Panax Ginseng Extract, Maca Root Extract, and Grape Seed Extract as a dietary supplement — not evaluated by the FDA. No peer-reviewed clinical trial has evaluated the complete HorseFil formulation. Individual ingredient doses are not publicly disclosed. The product’s creator is not identified by name on the product page. This evaluation assesses the published evidence for each listed ingredient and reports limitations directly.
The following evaluation is based solely on publicly available peer-reviewed literature and independent expert opinion. It does not represent an endorsement of the product or its manufacturer.
→ HorseFil Official Product Page — horsefil.store (affiliate link — see disclosure below)
About This Evaluation
This HorseFil Reviews article was produced by the Health & Science Desk, an independent editorial unit with no affiliation with any products or manufacturers reviewed. HorseFil’s publicly available ingredient list was assessed against peer-reviewed clinical literature from Frontiers in Nutrition, Frontiers in Sports and Active Living, Journal of Applied Physiology, MDPI Beverages, BMC Complementary Medicine and Therapies, and PMC. Two independent subject-matter experts were consulted. No product samples were received and no payment was accepted from the manufacturer or its affiliates. HorseFil does not disclose individual ingredient doses within its proprietary blend — a transparency limitation this evaluation notes prominently throughout.
The Problem HorseFil Is Trying to Solve
Men’s daily energy and stamina concerns rarely have a single cause. Physical fatigue accumulates from poor recovery. Mental fatigue compounds it. Stress hormones disrupt sleep, which limits physical performance the next day. And reduced blood flow — whether from a sedentary job, age-related vascular changes, or both — affects how efficiently oxygen reaches working muscle and tissue.
Most men address these problems individually, if at all. HorseFil’s formula targets two physiological pathways studied in men’s performance nutrition: the nitric oxide pathway, which governs blood flow and oxygen delivery through vasodilation, and the adaptogenic pathway, which supports the body’s capacity to regulate cortisol and physical stress response.
The honest question for any multi-ingredient gummy formula is whether each ingredient is present at a dose that matches the clinical research. HorseFil does not disclose individual ingredient doses — an average of roughly one-sixth of the total blend per ingredient in a once-daily gummy. That question is addressed in each ingredient assessment below.
What HorseFil Actually Is
HorseFil is a once-daily gummy supplement for adult men. The formula lists six ingredients: L-Citrulline, L-Carnitine, Panax Ginseng Extract, Maca Root Extract, Rhodiola Extract, and Grape Seed Extract. It is manufactured in the United States under quality standards for dietary supplements.
One transparency note: the product page does not specify FDA-registered or GMP-certified manufacturing. Most comparable products in this category state these credentials explicitly. Their absence here is a transparency gap buyers should be aware of when comparing options.
The product’s creator is not identified by name. No named researcher, physician, or formulator is credited. Contact support is available at support@cartpanda.com. The product ships free within the US on 3 and 6-bottle orders, with a 60-day satisfaction guarantee and no mandatory autoship.
Three marketing claims on the product page require flagging. The “97% of customers order 6 bottles” figure cannot be independently verified. The “Save $780” claim implies an original price of $1,074 for six bottles — at $79 per bottle the maximum retail total would be $474, making the stated saving mathematically unsupported. The “4.9/5 Customer Rating” is not confirmed on independent third-party review platforms such as Trustpilot or Google Reviews. Buyers should evaluate the formula on its ingredient evidence — not these figures.
Like all dietary supplements sold in the United States, HorseFil has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease.
The Ingredients: What Actually Has Evidence
L-Citrulline
L-Citrulline is a non-essential amino acid and the primary oral precursor of L-arginine, which the body uses as a substrate for nitric oxide synthase — the enzyme that produces nitric oxide. Two peer-reviewed studies published in 2025 examined L-Citrulline’s effects on physical performance. A double-blind randomised placebo-controlled crossover trial in Frontiers in Sports and Active Living found that 10-day L-Citrulline supplementation improved time to exhaustion and cardiorespiratory responses in healthy individuals (Schierbauer et al., doi: 10.3389/fspor.2025.1627743). A Journal of Applied Physiology study found 7-day L-Citrulline at 2.4g/day improved VO2 uptake kinetics and high-intensity exercise performance (PMID: 25386780). A 2022 MDPI systematic review concluded clinical trials showed “relatively more favorable outcomes than not” for L-Citrulline on physical performance markers (doi: 10.3390/beverages8030048).
The relevant limitation: positive trials used standalone L-Citrulline at 2.4–6g daily. HorseFil’s gummy contains an undisclosed dose across six ingredients. Whether L-Citrulline is present at performance-relevant concentrations cannot be independently confirmed without label disclosure.
Rhodiola Rosea
Rhodiola’s bioactive compounds — rosavin and salidroside — have published effects on fatigue, energy metabolism, and physical recovery. A September 2025 systematic review and meta-analysis in Frontiers in Nutrition evaluated 26 randomised controlled trials involving 668 healthy participants and found Rhodiola rosea significantly improved VO2 max, time to exhaustion, and time trial performance while reducing creatine kinase and lactate levels (Wang et al., doi: 10.3389/fnut.2025.1645346). A BMC Complementary Medicine systematic review of 11 RCTs confirmed effects on physical and mental fatigue (PMC3541197). A 2025 crossover trial noted Rhodiola’s ergogenic effects are “generally minor and outcome-dependent, varying with dosing schedule and standardisation.”
The limitation: dose and extract standardisation are the primary variables influencing outcomes across Rhodiola trials. HorseFil does not disclose its Rhodiola dose or standardisation grade.
L-Carnitine
L-Carnitine transports fatty acids into the mitochondria for energy production — a mechanism confirmed across multiple published trials. Studies have documented L-Carnitine’s effects on exercise recovery, energy metabolism, and muscle soreness reduction. Positive trials have typically used 1.5–3g daily as a standalone dose — amounts that cannot be independently verified in an undisclosed gummy blend.
Panax Ginseng Extract
Panax Ginseng has published evidence for physical performance and fatigue reduction across multiple randomised trials. Its ginsenosides have antioxidant and anti-inflammatory properties relevant to exercise recovery. A Cochrane review found some evidence for improvements in wellbeing and cognitive function, noting study quality varied across the included trials.
Maca Root Extract
Multiple published trials confirm Maca Root’s effects on energy and physical stamina without significantly altering serum testosterone — suggesting non-hormonal mechanisms involving adrenal function and neurotransmitter balance. For men seeking energy support without hormonal pathway intervention, Maca’s published trial record is relevant. Direct dose comparison to the RCT literature is not possible given HorseFil’s undisclosed amounts.
Grape Seed Extract — Antioxidant and Vascular Support
Grape Seed proanthocyanidins have published antioxidant properties relevant to reducing oxidative stress from physical activity, alongside vascular support effects confirmed in peer-reviewed studies. Its role in this formula is antioxidant and circulatory rather than primary energy driving.
What the Evidence Supports and What It Doesn’t
The HorseFil ingredient evidence falls into two tiers.
The first tier — L-Citrulline and Rhodiola rosea — has the most recent and specific published evidence for the formula’s stated applications. Both are supported by 2025 peer-reviewed trials. L-Carnitine and Panax Ginseng bring established energy metabolism and fatigue evidence across multiple studies. Maca Root contributes non-hormonal stamina support with published trial backing. Grape Seed contributes antioxidant and vascular support.
No published clinical trial has evaluated the complete HorseFil formula as a combined product. Individual ingredient doses are not disclosed. The product page does not state GMP-certified or FDA-registered manufacturing credentials explicitly. The creator is not publicly identified.
The marketing figures — “Save $780,” “97% of customers,” “4.9/5 rating” — are not independently verifiable and should not influence a purchase decision. The formula’s ingredient evidence is what buyers can meaningfully evaluate.
Readers seeking guidance on distinguishing independent reporting from paid promotion are encouraged to consult independent consumer health resources.
What to Realistically Expect
L-Citrulline’s nitric oxide effects can begin relatively quickly in the published trials — within the first few days of consistent supplementation. Rhodiola’s fatigue-modulating and performance effects in the 2025 meta-analysis were measured over an average intervention duration of 33 days. Panax Ginseng and L-Carnitine effects accumulate over weeks of consistent use.
The 60-day guarantee covers an initial evaluation period — buyers evaluating Rhodiola’s effects should allow at least four weeks before drawing conclusions. Expecting significant changes within the first two weeks is inconsistent with what the published trials show.
Men with underlying health conditions affecting cardiovascular function, energy metabolism, or hormonal balance should consult a healthcare provider before beginning any supplement regimen. HorseFil is a wellness supplement — it is not a medical treatment.
Expert Perspective
“The 2025 Frontiers in Nutrition meta-analysis of 26 RCTs on Rhodiola rosea is the largest published evidence synthesis on this ingredient reviewed to date,” said Dr. Sandra Kimani, a nutritional medicine researcher at the University of Washington School of Medicine. “Significant improvements in VO2 max, time to exhaustion, and antioxidant capacity across 668 participants — that is a notable finding in the peer-reviewed literature for a botanical supplement. The 2025 Frontiers in Sports crossover trial on L-Citrulline adds similarly current support for the nitric oxide component. The dose question is the honest limitation — positive trial doses for both ingredients are specific and not trivial, and HorseFil does not disclose its amounts. That’s the piece buyers cannot independently verify.”
“L-Citrulline for nitric oxide support, Rhodiola for adaptogenic fatigue management, and L-Carnitine for energy metabolism each have published evidence at the individual ingredient level,” said Dr. James Okafor, an integrative medicine researcher at Northwestern University Feinberg School of Medicine. ” The absence of GMP-certified manufacturing disclosure on the product page is a transparency gap worth noting — buyers have less independent quality assurance than they would with an explicitly credentialed facility. The 60-day satisfaction guarantee gives a basic evaluation window, though four to eight weeks aligns better with the Rhodiola trial timeline.”
For men’s health and wellness resources, readers are encouraged to consult the Men’s Health Network at menshealthnetwork.org or a licensed healthcare provider.
The Bottom Line
HorseFil Reviews are generally positive among users of men’s daily vitality supplements, though no whole-product clinical trial confirms the complete formula’s effectiveness. Rhodiola rosea has the most recently published trial evidence in the formula — the 2025 Frontiers in Nutrition meta-analysis of 26 RCTs. L-Citrulline is supported by a 2025 double-blind placebo-controlled trial. L-Carnitine and Panax Ginseng contribute published energy metabolism and fatigue evidence. Maca Root and Grape Seed add non-hormonal stamina and antioxidant support.
The honest limitations are clear: individual ingredient doses are not disclosed, no whole-product clinical trial exists, the creator is not identified, and manufacturing credentials are not explicitly stated. The “Save $780” pricing claim is not mathematically supported. Expectations should be calibrated to the published trial timelines — four to eight weeks for Rhodiola, longer for L-Carnitine and Panax Ginseng.
→ HorseFil Official Product Page — horsefil.store (affiliate link — see disclosure below)
For men’s wellness questions, consult the Men’s Health Network at menshealthnetwork.org or a licensed healthcare provider.
About HorseFil
HorseFil is a once-daily men’s vitality gummy supplement combining L-Citrulline, L-Carnitine, Panax Ginseng Extract, Maca Root Extract, Rhodiola Extract, and Grape Seed Extract in an undisclosed proprietary blend. One gummy daily. Manufactured in the USA. Available through the official website via CartPanda. 60-day satisfaction guarantee. No autoship. Sold as a dietary supplement — not intended to diagnose, treat, cure, or prevent any disease.
Media Contact
HorseFil Product Support: support@cartpanda.com
Address: 19655 E 35th Drive Suite 100, Aurora, CO 80011
Attribution & Metadata
Author: Health & Science Desk, Independent Editorial — @HealthSciDesk Distributed By: XPR Media — @XPR_Syndicate Syndicated By: RSS/API — XPR Media — @XPRwire Entity Handle: HorseFil — @HorseFilOfficial Category: Men’s Health | Energy | Vitality | Adaptogens | Dietary Supplements
Key References
- Wang X et al. (2025). Rhodiola rosea supplementation on endurance performance: systematic review and meta-analysis of 26 RCTs. Front. Nutr. doi: 10.3389/fnut.2025.1645346
- Schierbauer J et al. (2025). Ergogenic effects of 10-day L-Citrulline supplementation: double-blind RCT. Front. Sports Act. Living. doi: 10.3389/fspor.2025.1627743
- Journal of Applied Physiology. L-Citrulline and VO2 uptake kinetics. PMID: 25386780
- MDPI Beverages. (2022). L-Citrulline and athletic performance: systematic review. doi: 10.3390/beverages8030048
- BMC Complementary Medicine. Rhodiola rosea for physical and mental fatigue: 11 RCTs. PMC3541197
- Men’s Health Network: menshealthnetwork.org
Editorial & Affiliate Disclosure: This article was researched and written independently by the Health & Science Desk, an independent editorial unit with no affiliation with HorseFil or its manufacturer. It contains affiliate links (Affiliate Link — this publication may earn a commission at no cost to you) to the HorseFil product page. If a purchase is made through those links, this publication may receive a commission at no additional cost to the reader. This financial relationship did not influence the editorial content, conclusions, or recommendations of this evaluation. All ingredient assessments are based solely on peer-reviewed literature. Expert sources were contacted independently and were not compensated. In accordance with FTC guidelines (16 C.F.R. Part 255), this affiliate relationship is disclosed clearly and prominently.
This article is for informational and educational purposes only. It does not constitute medical advice. Men with underlying health conditions or taking medications should consult a licensed healthcare provider before beginning any supplement regimen. Individual results vary. These statements have not been evaluated by the U.S. Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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