Mordeduras y Picaduras

Acetyl-L-Carnitine (ALC) has been studied in clinical trials for erectile dysfunction, particularly in aging men and post-prostatectomy patients. Combined with Propionyl-L-Carnitine (2 g/day each), it outperformed oral testosterone in improving erectile function and nocturnal penile tumescence in a randomized study of 120 aging men. It modulates androgen activity and supports nerve function relevant to erection.

ALA has been studied in men with erectile dysfunction (ED), particularly in the setting of type 2 diabetes mellitus. Clinical evidence includes a randomized prospective trial in 45 diabetic men with ED and a trial in 123 diabetic men with ED evaluating a nutraceutical combination containing ALA. The proposed mechanism involves improving nitric oxide bioavailability through eNOS recoupling.

A 2023 triple-blind RCT in 60 adult males on SSRIs found that 500 mg/day of A. galanga extract significantly improved IIEF scores vs. placebo (p<0.001, Cohen's d=0.49). The plant has also been shown to enhance androgenic activity and is linked to testosterone elevation in preclinical models.

The arginine component of AAKG is a precursor to NO in penile vascular tissue, and L-arginine RCTs show modest benefit in mild-to-moderate erectile dysfunction. Direct AAKG-specific evidence is very limited, with most data extrapolated from L-arginine trials; combining AAKG with PDE5 inhibitors has been proposed as additive.

Ashwagandha (Withania somnifera) has been studied for psychogenic erectile dysfunction in an Ayurvedic clinical trial (AYU, 2011), and a separate RCT documented significant improvement in sexual function and testosterone in men. The 2023 MDPI dietary supplement analysis listed Withania somnifera among ingredients with one positive clinical reference for ED. Its stress-adaptogenic and testosterone-supportive properties are mechanistically relevant to erectile function.

Icariin from Barrenwort inhibits phosphodiesterase type 5 (PDE5) and upregulates endothelial and neuronal nitric oxide synthase (eNOS/nNOS) in penile tissue, mechanisms directly relevant to erectile function. Animal studies demonstrate dose-dependent improvements in intracavernous pressure and smooth muscle preservation in nerve-injured rats. Epimedium has been used in Chinese clinical preparations for erectile dysfunction, though large-scale controlled human trials remain limited.

Cordyceps (Cordyceps sinensis/militaris) has traditional use in Tibetan and Chinese medicine as a kidney-yang tonic for sexual debility and impotence. Clinical studies in China have reported improvements in sexual function and libido. The active compound cordycepin and adenosine analogs may enhance NO production and testosterone synthesis relevant to erectile function.

NMDA receptors in the hypothalamic paraventricular nucleus play a documented role in mediating penile erection via nitric oxide signaling, and D-Asp is an endogenous NMDA receptor agonist. Animal research shows that excitatory amino acid levels, including D-Asp-related ligands, rise in the paraventricular nucleus during sexual activity and that NMDA receptor blockade impairs erectile responses. No human RCTs have directly tested DAA supplementation for erectile dysfunction.

The Massachusetts Male Aging Study identified DHEAS as the only hormone out of 17 tested that correlated significantly with erectile dysfunction. A small double-blind RCT in men with low DHEAS and ED showed improvement in International Index of Erectile Function scores with 50 mg/day DHEA over six months. Evidence is limited and inconsistent; DHEA is a weak androgen and does not restore erections in castrated animal models.

Cornus officinalis extract has been studied in preclinical models for erectile dysfunction. One in vitro and in vivo study found concentration-dependent relaxation of corpus cavernosum tissue and significantly elevated intracavernous pressure in rats after oral administration. Human trial data are absent.

In STZ-induced diabetic rats, eucommia leaf extract (16 weeks) significantly increased intracavernosal pressure, NO levels, cGMP, and testosterone, and improved erectile function via the Akt-eNOS pathway and HPG axis enhancement. Traditional use for male impotence is well documented in TCM. Human clinical trials are lacking.

Eurycoma longifolia is the botanical source of Tongkat Ali, supported by multiple RCTs for erectile function improvement. Its active compounds (eurycomaoside, eurycomanone) are linked to testosterone support and inhibition of Rho-kinase II in penile smooth muscle. A systematic review of human clinical trials confirms its significance in managing erectile dysfunction and low libido in men.

Fenugreek (Trigonella foenum-graecum) has been studied for male sexual function in clinical trials, primarily for libido and sexual arousal, with some evidence for erectile function. A randomized, double-blind, placebo-controlled crossover study (World J Mens Health, 2021) found a combination including testofen (fenugreek extract) and L-citrulline significantly improved IIEF scores including erectile function domains. Fenugreek's furostanolic saponins may modulate testosterone levels.

Intracavernosal injection of forskolin has been investigated as a treatment for vasculogenic erectile dysfunction, as cAMP promotes smooth muscle relaxation and penile blood flow. Small human studies suggest efficacy when administered by direct injection.

A 2021 systematic review of 5 RCTs (475 participants) concluded that ginkgo biloba has limited positive effects on sexual function overall. Evidence for male erectile function specifically is weak, with preclinical data showing benefit after nerve injury but human trial results being inconsistent. The overall clinical evidence does not currently support ginkgo as an effective monotherapy for erectile dysfunction.

Panax (Korean red) ginseng is among the most clinically studied natural treatments for erectile dysfunction. A systematic review of 7 RCTs (n=349) published in BJC Pharmacology (2008) showed a significant effect vs placebo (risk ratio 2.40; 95% CI 1.65–3.51, p<0.00001). A subsequent meta-analysis of 5 RCTs (n=369) confirmed significantly improved IIEF scores (pooled MD=2.67, p=0.0009).

Ginsenosides are the primary bioactive compounds in Panax ginseng responsible for its effects on erectile function. They promote endothelial nitric oxide synthesis and relax corpus cavernosum smooth muscle. Clinical trials of ginseng preparations standardized to ginsenoside content have demonstrated significant improvements in IIEF scores in ED patients.

Horny goat weed (Epimedium spp.) contains icariin, which inhibits PDE5 in corpus cavernosum smooth muscle cells in vitro—the same target as sildenafil. Animal studies in aged, diabetic, and castrated rats demonstrate efficacy for erectile dysfunction. Traditional Chinese medicine has used it for centuries for impotence.

Icariin is the primary bioactive flavonoid glycoside in horny goat weed (Epimedium spp.) and has been shown to inhibit phosphodiesterase type 5 (PDE5) in vitro, elevating cGMP levels in corpus cavernosum smooth muscle cells. Animal studies demonstrate it improves erectile function in aged, diabetic, and castrated rodent models. No completed human RCT exists, but the mechanism mirrors that of PDE5 inhibitor drugs.

L-arginine is a precursor to nitric oxide (NO), essential for penile smooth muscle relaxation and erection. A 2022 multicentre, double-blind, placebo-controlled RCT (N=98) showed 6 g/day for 3 months significantly improved IIEF-6 scores (p<0.0001) in vasculogenic ED patients. A 2021 meta-analysis of RCTs confirmed significant improvement in erectile function with L-arginine alone or combined with PDE5 inhibitors.

Clinical studies show propionyl-L-carnitine and acetyl-L-carnitine can improve erectile function, particularly in men with diabetic or post-surgical neurogenic erectile dysfunction. One study found carnitine improved sildenafil response in men with diabetes who had not previously responded; another found a combination enhanced outcomes post-prostatectomy.

L-Citrulline is a non-essential amino acid that is efficiently converted to L-arginine in the kidneys, raising plasma arginine levels more sustainably than direct L-arginine supplementation. A randomized, double-blind, placebo-controlled crossover pilot study (Sexual Medicine, 2018) showed L-citrulline combined with resveratrol improved erectile function in PDE5 inhibitor-using men. It is recognized as a nutraceutical for ED in multiple 2023 reviews.

Maca (Lepidium meyenii) root, traditionally cultivated in the Peruvian Andes for fertility and sexual vitality, has been evaluated in RCTs for erectile dysfunction. A 2009 randomized double-blind clinical trial (Andrologia) showed significant improvement in IIEF-5 scores vs placebo in mild ED. A 2010 systematic review (BMC Complement Altern Med) found significant positive effects on sexual dysfunction in RCTs, including one specifically assessing IIEF in ED patients.

M. officinalis oligosaccharides (MOO) alleviated CUMS-induced erectile dysfunction in mice alongside antidepressant effects, operating via HPG axis normalisation and BDNF/TrkB/CREB pathway activation. Traditional TCM documentation for impotence (erectile dysfunction) as a primary indication dates to the Shennong Bencao Jing.

PABA (as Potaba) has been evaluated in Peyronie's disease, a connective tissue disorder of the tunica albuginea causing penile curvature, pain, and erectile dysfunction. A randomized placebo-controlled trial of 103 men over 12 months found higher response rates and significant plaque size reduction with Potaba versus placebo. The European Association of Urology gives a Grade B recommendation for its use in reducing plaque size and pain.

A double-blind RCT (n=21, 120 mg/day for 3 months) showed Pycnogenol improved erectile function from moderate to mild stage (IIEF-5 score improvement of 33%) versus placebo. A combination of Pycnogenol with L-arginine further improved erectile dysfunction in additional RCTs. Mechanism involves enhanced NO-mediated vasodilation.

Pine bark extract (Pycnogenol, from Pinus pinaster) has been evaluated in clinical studies for erectile dysfunction, primarily in combination with L-arginine. Two studies testing 120 mg/day of Pycnogenol as a sole intervention reported improvements in erectile function. A 2023 meta-analysis (Frontiers Endocrinology) of the Pycnogenol–L-arginine combination confirmed significant IIEF improvements.

A pilot RCT (n=53) reported improved erectile function scores with 8 oz pomegranate juice daily for 28 days in men with mild-to-moderate ED, though statistical significance vs. placebo was not fully reached. The proposed mechanism is enhanced nitric oxide production and improved penile blood flow. Evidence is promising but limited.

Propionyl-L-Carnitine (PLC) has been studied in randomized, double-blind, controlled trials for erectile dysfunction, particularly in diabetic and prostatectomy patients. A 2004 RCT (Curr Med Res Opin) found PLC 2 g/day plus sildenafil significantly outperformed sildenafil alone in sildenafil-refractory diabetic ED. A 3-month study combining PLC with L-arginine and niacin showed statistically significant IIEF improvement.

An open clinical trial of 35 men with erectile dysfunction and/or premature ejaculation found that 150–200 mg/day of Rhodiola extract over three months produced substantially improved sexual function in 26 of the participants. A separate small trial of 40 participants reported that 75% experienced improved sexual performance after taking 2000 mg/day of Rhodiola extract for one month. The evidence base is small and methodologically limited, with no placebo-controlled RCTs specifically for ED.

Saffron (Crocus sativus) has traditional use as an aphrodisiac in Middle Eastern and South Asian medicine. A 2018 systematic review and meta-analysis (PMC6727438) found saffron had a significantly positive effect on all domains of the Erectile Function questionnaire (MD for EF domain=5.36, p=0.00) based on 3 clinical trials. A topical saffron gel RCT in diabetic ED patients also showed positive results.

Preclinical data show saw palmetto extract inhibits phosphodiesterase-5 (PDE5) activity and increases inducible nitric oxide synthase (iNOS) expression in corpus cavernosum tissue. A multicenter 6-month open-label pilot study in BPH patients found significant improvement in sexual dysfunction scores alongside urinary symptom improvement. Evidence is preliminary and human trials are not placebo-controlled for erectile function specifically.

The same Arletti et al. (1999) rat study demonstrated that P. paniculata extract improved copulatory performance in sexually impotent rats, including metrics directly related to erectile and ejaculatory function. This is the primary published evidence for this link, supported by traditional use as a sexual restorative.

Tongkat Ali (Eurycoma longifolia) root extract is traditionally used as an aphrodisiac in Southeast Asia and has been studied in RCTs for erectile function. A meta-analysis of RCTs (2015, Complementary Therapies in Medicine) and a 6-month double-blind RCT (2020, Phytomedicine) both reported improvements in IIEF-5 erectile function scores. A systematic review noted clinical benefit on erectile function with a good safety profile.

Tribulus (Tribulus terrestris) has been investigated in RCTs for erectile dysfunction with some positive and some null findings. Its protodioscin content may enhance nitric oxide release in penile tissue. A 2023 systematic review identified it among the botanicals with multiple positive RCTs for ED using IIEF outcomes.

Tribulus terrestris has been studied in prospective, double-blind, placebo-controlled RCTs for erectile dysfunction, with mixed but partially positive findings. Its steroidal saponins (protodioscin) may enhance androgen receptor sensitivity and nitric oxide release. A 2023 systematic review identified it among the six botanicals with at least two positive RCTs for ED.

MP is classified in Ayurvedic medicine as 'vajikarna' (aphrodisiac/virility enhancer). Clinical studies demonstrate MP restores testosterone, dopamine, and LH levels in infertile men, all of which support erectile function. Preclinical data show MP may increase nitric oxide (NO) production, improving penile blood flow. A review of clinical and preclinical trials (2025) specifically examined MP for erectile dysfunction in type 2 diabetes patients.

Watermelon-derived L-citrulline supports erectile function by raising L-arginine and nitric oxide levels, facilitating penile smooth muscle relaxation and increased blood flow. A small but significant RCT confirms L-citrulline supplementation improves erection hardness in mild ED. Epidemiological data also link higher dietary lycopene intake to lower ED risk.

Yohimbe is the bark of Pausinystalia yohimbe, the primary natural source of the alkaloid yohimbine, which has established alpha-2 adrenergic blocking activity relevant to erectile function. It has long traditional use in West Africa as an aphrodisiac. Multiple RCTs of yohimbine (the purified alkaloid) support the mechanism; the bark extract is the traditional delivery form.

Yohimbine is an alpha-2 adrenergic receptor antagonist derived from Pausinystalia yohimbe bark, with one of the longest clinical histories for erectile dysfunction. Multiple RCTs and meta-analyses support efficacy in psychogenic and mixed-type ED. It is recognized by the AUA and international guidelines as having clinical evidence for ED.

Zinc is essential for testosterone biosynthesis and is recognized as a cofactor for enzymes involved in sexual function. Clinical evidence links zinc deficiency to hypogonadism and erectile dysfunction; zinc supplementation in deficient men restores testosterone and improves sexual function. A 2023 animal study (Redox Rep) mechanistically confirmed zinc improves erectile function by preventing penile oxidative injury and upregulating testosterone.

Traditional Chinese medicine uses boxthorn as a male tonic for sexual function, with the berry's testosterone-raising and HPG-axis-activating properties providing a plausible mechanism. Animal studies show LBP restores sexual behavior in diabetic mice. No dedicated human RCT has assessed erectile function as a primary outcome.

Broomrape (Orobanche spp.) has a long-documented history of use as a remedy for impotence in Traditional Chinese Medicine (TCM), Tibetan medicine, and Western herbal traditions. The closely related Cistanche (also called broomrape in English, Orobanchaceae family) has preclinical animal evidence supporting its androgen-modulating effects. No controlled human trials specifically on erectile function exist for either Orobanche or Cistanche alone.

Coleus forskohlii has a documented traditional use for sexual problems in men in Ayurvedic medicine. Forskolin's cAMP-elevating action on smooth muscle relaxation provides a plausible mechanistic basis. No human clinical trials on erectile function have been published.

Cowage seed has documented traditional use as an aphrodisiac in Ayurveda and Unani medicine for erectile function. Human clinical studies show it raises testosterone and lowers prolactin, both relevant to erectile function, and one published study noted M. pruriens may increase nitric oxide production. No dedicated ED randomized clinical trial exists.

Damiana (Turnera diffusa) has been used traditionally in Mexico and Central America as an aphrodisiac and sexual tonic, particularly for erectile dysfunction and libido in men. It has been included in clinical combination herbal studies (e.g., VigRx Plus RCT) that showed IIEF improvements in mild-to-moderate ED. Isolated clinical evidence for Damiana alone is limited to traditional use and animal studies.

Dodder seed (Tu Si Zi) is a classical TCM tonic for kidney-yang deficiency, where impotence is a primary indication. It is described in traditional materia medica for treating 'impotence, nocturnal emission, and frequent urination.' TCM practitioners use it as an aphrodisiac and tonic for sexual function. Scientific mechanistic evidence from animal studies exists, but no human clinical trials specifically addressing erectile function have been published.

Muira Puama (Ptychopetalum olacoides) is a Brazilian Amazonian shrub with long traditional use as a sexual tonic and aphrodisiac for erectile dysfunction. An open-label clinical study (1994, Institute of Sexology, Paris) in 262 men with sexual dysfunction reported 51% rated it effective for ED. It was included in the VigRx Plus double-blind RCT that showed IIEF improvements in mild-to-moderate ED men.