Designed for the moment. Not the routine.

Every other formula in the Marco's Grounds™ system is a daily protocol — taken consistently over time to build a baseline. BlackHorn™ is different by design.

It's the pre-performance formula. Taken 45–60 minutes before intimacy, when you want to feel sharper, more physically present, and more certain going in. Not every occasion needs it. Some do. When it does, you want the right tool.

The formula is led by Epimedium Extract — Horny Goat Weed, standardized to 100mg of Icariins per serving. Icariins is the active compound responsible for the botanical's centuries-long traditional use and its more recent research attention for male arousal and blood flow support. At 1,000mg of extract, this is not a token inclusion.

How BlackHorn™ fits the system.

Complements StoneBone™, doesn't replace it

StoneBone™ is the daily foundation — blood flow, libido, and stress resilience built consistently over time. BlackHorn™ is the situational layer — taken before specific occasions when you want additional arousal support and a sharper physical edge. Most men who use both describe them as doing different, complementary jobs.

The difference from stimulant products

Many pre-performance supplements rely on stimulants — caffeine-adjacent compounds that create energy and urgency. That can work, but it also creates anxiety, jitteriness, and a crash that arrives at the wrong moment. BlackHorn™ uses no stimulants. The arousal and blood flow support it provides feels different — less wired, more present.

Not habit-forming, not daily

Because BlackHorn™ is occasion-based, there is no dependency and no need to take it every day. The formula is designed for use when you choose — 2 capsules, 45–60 minutes before the moment.

Why BlackHorn™ is built around Epimedium.

Epimedium extract — commonly known as Horny Goat Weed — has one of the longest traditional use histories in male sexual wellness, and one of the more credible bodies of modern research for its active compound, Icariins.

Icariins works primarily as a phosphodiesterase type 5 (PDE5) inhibitor — the same mechanism class used by prescription sexual performance medications, but through a natural botanical pathway and at a fraction of the potency. It supports blood flow and male arousal without the prescription route, the side-effect profile, or the dependency.

At 1,000mg of extract standardized to 100mg active Icariins per serving, BlackHorn™ delivers a dose of Epimedium that is serious by supplement standards. The rest of the formula supports the Epimedium mechanism with botanicals and amino acids that address complementary aspects of male arousal and readiness.

Full ingredient breakdown — 9 active compounds.

1,164.5 mg per serving · 60 capsules · 30 servings · GMP-certified, FDA-registered facilities · Formulated in Switzerland · Made in the USA · Non-GMO · Third-party tested for purity and potency

BlackHorn™ instructions.

BlackHorn™ is designed for use before specific occasions — not as a daily supplement. Take it when you want additional arousal support and a sharper physical edge. The formula is built around this situational use.

Standard dose: 2 capsules, 45–60 minutes before intimacy

Take with a full glass of water. The Epimedium mechanism works best with lead time — 45 minutes is the optimal window for most men. Some men prefer 60 minutes. Do not exceed 2 capsules per occasion.

How often can I take it?

BlackHorn™ can be taken as needed — once per occasion, when the occasion calls for it. It is not intended for daily use. If you are looking for daily baseline support for drive and readiness, StoneBone™ is the right formula for that job.

Stacking with StoneBone™

BlackHorn™ and StoneBone™ serve different roles and complement each other without overlap. StoneBone™ builds the daily baseline — drive, blood flow, and performance resilience over time. BlackHorn™ provides situational support on specific occasions. Most men who use both take StoneBone™ daily and BlackHorn™ as needed.

Medical disclaimer.

BlackHorn™ is not intended for individuals under 18, or for pregnant or nursing individuals. If you are managing a medical condition, taking prescription medications — particularly medications for blood pressure or erectile dysfunction — or have specific health concerns, consult your healthcare provider before use. Do not combine with pharmaceutical PDE5 inhibitors.

Ships from the USA. Delivered discreetly.

All orders ship from our US warehouse. Packaging is plain — no brand name or product name on the outside. We ship worldwide.

USA & North America

• Standard delivery (3–5 business days) — $8.90
• Express delivery (1–2 business days) — $14.90, or free for subscriptions after first order and on orders over $150

Europe

• Standard delivery (10–15 business days) — $8.90
• Express delivery (5–9 business days) — $14.90, or free for subscriptions and orders over $200

Rest of World

• Standard delivery (10–15 business days) — $12.90
• Express delivery (5–9 business days) — $19.90, or free for subscriptions and orders over $200

30-day money-back guarantee.

If you don't feel a meaningful improvement within 30 days of your first order, contact us for a full refund. No complicated process. No hold times. Applies to first-time purchasers on initial orders only — limit one per product per household.