Table 1.

Characteristics of sexual enhancer products sold online.

Brand name	Ingredients	Cost	Availability	Effects/declared advantages from anecdotal online reports	Side effects/disadvantages from anecdotal online reports
Endowmax http://www.endowmax.com/	Epimedium grandiflorum (horny goat weed); maca; damiana; L-arginine; Tribulus terrestris; gamma-aminobutyric acid; jujube dates extracts; Muira puama (potency woods); Catuaba bark; Xanthoparmelia scabrosa; Cnidium monnieri; Tongkat Ali (Eurycoma longifolia)	59.95 $ per box; six-month supply for 239.95 $	Online suppliers (orders can be placed by fax and phone); Ebay; Amazon (currently out of stock).	Powerful and natural; no unpleasant side effects; customers testimonials; money back guarantee; it is clearly stated the product does not contain Yohimbe.	Up to 8 weeks for initial benefits; expensive.
Xytomax http://www.xytomax.com/	Niacinamide (vitamin B3); zinc oxide; Epimedium sagittatum (standardized to 10% icariin); maca root; Guarana extract (standardized to 20% caffeine); Korean ginseng root; L-arginine; Muira puama; Longjack extract; Avena sativa; Yohimbe bark extract (2% yohimbine); Ginkgo biloba extract (24% flavonglycodises & 6% terpene lactones); saw palmetto (berry); Xanthoparmelia Scabrosa; Cnidium monnieri extract; GABA; damiana (leaf)	69.96 $ per box; six-month supply for 309.95 $	Online suppliers (orders can be placed by fax and phone); Ebay.	Natural; working from the very first dose; customers testimonials; money back guarantee.	It is not to be used in case of thyroid, kidney, or heart diseases or high blood pressure; more expensive than other products.
Xanogen http://www.xanogen.com/	Epimedium grandiflorum (horny goat weed); maca; Yohimbe; L-arginine; Tribulus terrestris; gamma-aminobutyric acid; Muira puama (potency woods); Catuaba bark; Xanthoparmelia scabrosa; Cnidium Monnieri	89.95 $ per box; six-month supply for 419.95 $	Online suppliers (orders can be placed by fax and phone); Ebay; Amazon (currently out of stock).	100% natural products; money back guarantee; no negative side effects; permanent effects on corpora cavernosa.	It could cause stomach upset if not taken with food; it does not provide immediate erections but stronger ones.
Virility EX http://www.virilityex.it/	Yohimbe; maca; Elk Antler Velvet; Eleuthero; Longjack; Muira puama (potency woods); Catuaba bark; oat straws.	29.89 € per box; six-month supply for 89.74 €	Online suppliers (orders can be placed by fax and phone); Ebay; Amazon (currently unavailable).	Stated as: “No side effects; 100% natural; money back guarantee.”	Some users claim no results with this product; just a couple of customer testimonials were found on official websites with no FAQ sections.
Enzyte http://www.enzyte.com/	Korean red ginseng; Gingko biloba; grape seed extract; horny goat weed; Muira puama; niacin; zinc.	39.95 $ per box; six-month supply for 179 $	Online suppliers; Ebay; Amazon.	Premium natural ingredients; no gluten, no preservatives, no ephedra, no caffeine, no Yohimbe.	Reported hives, facial flushing, insomnia, and internal bleeding; some users claim no results with this product.
Extagen http://www.extagen.com/	Not clearly listed on website, just “herbs and phytonutrients.”	59 $ per box; six-month supply for 198 $; twelve-month supply for 288 $	Online suppliers (orders can be placed by phone, and mail too); Ebay; Amazon.	Natural, vegetarian and hypoallergenic; money back guarantee; it is clearly stated the product does not contain Yohimbe; customers testimonials.	Contraindicated in case of high blood pressure or other medical conditions.
Extenze http://www.extenze.net	L-Arginine; Eleutherococcus; Yohimbe bark extract; nettle; ginseng; folate; micronized DHEA; Muira puama; pregnenolone; zinc; black pepper; Piper longum; ginger. Cnidium monnieri; Astragalus: Xanthoparmelia Scabrosa; boron; GABA; velvet deer antler; horny goat weed; damiana; pumpkin; licorice extract; Ho Shou Wu extract.	59.95 $ per box; six-month supply for 305.95 $; ten-month supply for 499.95 $	Online suppliers (orders can be placed by fax, phone, and mail too); Ebay.	Stated as: “all natural; assures penis enlargement in addition to increasing sexual stamina; customers testimonials; money back guarantee.”	Legal controversies; reported increased heart rates, agitation, and nervousness.
Maxidus http://www.maxidus-pill.com/	Eurycoma longifolia; Flos catharmi; Rizoma Curcumae longae; Gingko biloba; Herba Epimedii; Herba Cistanches; Astragalus membranaceus; Momordica charantia L (Ku Gua).	39.95 $ per box; six-month supply for 399.75 $; twelve-month supply for 479.40 $	Online suppliers (orders can be placed by fax, phone, and mail too); Ebay.	Stated as: “works in 10–30 minutes and lasts for up to 4 days; money back guarantee; 100% natural; it can be taken by people with heart or prostate problems, hypertension, diabetes; it can be used by women too.”	Slight headache reported; expensive; clinical tests carried out are shown for only one ingredient (Eurycoma longifolia).
Orexis http://www.orexis-pills.co.uk	Tribulus terrestris; Epimedium sagittatum; Muira puama; Panax ginseng; Catuaba bark extract; damiana; Yohimbe extract.	29.16 £ per box; six-month supply for 135.00 £; twelve-month supply for 262.50 £	Online suppliers (orders can be placed by fax, phone, and mail too); Ebay.	Stated as: “all natural; works within 45 minutes; customers testimonials; money back guarantee.”	Legal issues; interaction with antidepressants, diuretics, and high blood pressure medications.
Pro Solution Pills http://www.prosolutionpills.com/	Solidilin; Korean ginseng; Butea superba; Momordica; apigenin; Amla; Arjuna; Cordyceps; zinc oxide: reishi mushroom; Curculigo; drilizen; bladderwrack.	59.95 $ per box; six-month supply for 289.95 $; twelve-month supply for 399.95 $	Online suppliers (orders can be placed by fax, phone, and mail); Ebay; Amazon.	Stated as “all natural; no side effects; multiple orgasms per sexual encounter; customers testimonials; money back guarantee.”	Reported nausea, hypertension; increased heart rate, dizziness; it needs 5-6 months before the user notices the desired results.
Provigro http://www.provigro.com	Horny goat weed; maca root; saw palmetto; Tongkat Ali; Mucuna pruriens 10% L-dopa; Muira puama; L-arginine; Panax ginseng.	34.97 $ per box; three-month supply for 57.80 $	Online suppliers (orders can be placed by fax, phone, and mail).	Stated as “natural vitamins, minerals and herbs”; customers testimonials; money back guarantee; it does not contain Yohimbe.	Reported nausea, dizziness, and vomiting; it may take up to six months to work.
Quantum Pills http://www.quantumpills.com	L-arginine; L-lysine HCL; maca root; Muira puama; Swedish flower pollen extract; horny goat weed; Catuaba bark; Gingko biloba; zinc oxide.	44.95 $ per box; six-month supply for 189.95 $	Online suppliers (orders can be placed by fax, phone, and mail too).	Stated as a “climax enhancer,” assures increase in ejaculation volume; natural; money back guarantee; customers testimonials.	No permanent results; no scientific proofs and no adequate ingredients explanation.
Sinrex http://www.sinrex.com	Bioperine; copper chelate; creatine; Cuscuta seed; Gingko biloba; green tea extract; Hawthorn berries; Epunedum Sagitum; inosine; L-arginine; maca; omega 3; saw palmetto; Siberian ginseng; soy proteins; Tribulus terrestris; vitamin E.	39.95 $ per box; six-month supply for 199.95 $	Online suppliers (orders can be placed by fax, phone, and mail too); Ebay.	Presented as “all natural; money back guarantee; customers testimonials; semen volume and orgasm intensifier.”	At least one month for initial results; possible allergies to ingredients.
Sizepro http://www.sizepro.com	Vitamin E; vitamin B3; horny goat weed; hawthorn berry; damiana; Muira puama; Gingko biloba; Chinese ginseng; Tribulus fruit extract; Catuaba bark; saw palmetto; inosine; L-arginine; oat straw; cayenne fruit; soy protein.	Two-month supply for 99.95 $; six-month supply for 245.95 $	Online suppliers (orders can be placed by fax, phone, and mail too); Ebay.	Natural; “Lasting increase of penis thickness and size; money back guarantee; customers testimonials.”
Vazomyne http://www.vazomyne.net	Not completely listed. Vazomyne includes L-arginine, saw palmetto, Gingko biloba, damiana, Polygonum multiflorum, nettle leaf, Muira puama.	39.99 $ per box; three-month supply for 99.98 $	Online suppliers (orders can be placed by fax, phone, and mail too); Ebay.; Amazon (currently not available).	Presented as: “natural; money back guarantee; customers testimonials.”	Ingredients are not fully listed nor explained in details; “It should not be taken in case of heart or thyroid problems; will not increase penis size.”