I’ve tried a few herb‑based mixes – ginseng, maca root, and L‑arginine – and they give a mild boost with few side‑effects, but for reliable hardness I rely on cobra tabletten. The 120 mg sildenafil tablet works within 20‑30 minutes, lasts 4‑7 hours, and I start with a half tablet to gauge tolerance. Just avoid nitrates and heavy drinking.