All-Natural Male Enhancement
Vigorexin is an good male enhancement supplement. The testimonials on the official website are supportive of this as well as testimonials found on third-party sites. There is no doubt Vigorexin is formulated with effective ingredients.
- Ingredient Quality
- Negative Side Effects
- Speed of Result
Vigorexin poses a question to readers: “How Do You Measure Up?”
According to the official website, 95% of men are unhappy with their penis size.
Vigorexin is a male enhancement product designed to increase erection size and mass, boost sexual stamina, and enhance sex life.
Retailing for $19.95 per bottle, Vigorexin is supported with bold claims. I took a closer look to see if it is worth the money.
What We Know About the Ingredients
Vigorexin provides information about several ingredients on the official website. However, they don’t list ingredient amounts. but according to customer testimonials, the amounts the amount of ingredients used effectively produces impressive benefits.
Here’s a look at some ingredients:
Oysters are among the highest zinc sources, providing roughly 74 mg per 3 ounces. 
According to the National Institutes of health, adult males should consume around 11 mg zinc per day to meet nutrient requirements. 
According to one clinical study, 200 mg eurycoma longifolia per day led to “significant improvements in all semen parameters.” These parameters include semen volume, sperm concentration, and sperm motility. 
Horny Goat Weed
This ingredient is better known for its icariin content. Icariin is a testosterone mimetic.
One animal study shows icariin enhanced reproductive organ conditions and amplified circulating testosterone levels.  Unfortunately, I was unable to find a clinically-studied horny goat weed dose and equivalent human studies.
Catuaba is thought to improve sexual function, but there isn’t enough evidence to prove this claim. 
Tribulus terrestris is a known for its testosterone-boosting benefit.
One study administered a tribulus terrestris supplement (625 mg) 3 times a day to athletes during a 20-day study. Results show blood testosterone concentration increased for the first 10 days but “did not grow during the next 10 days while consuming Tribulus still.” 
Is Vigorexin A Daily Pill?
Unlike several competing male enhancement supplements that are taken daily, Vigorexin can be taken daily or taken 20-30 minutes before sexual activity. Users should experiment with ingestion times because Vigorexin may take effect quicker in some individuals.
Does the Company Back Vigorexin?
Vigorexin is supported with a 90-day money-back guarantee.
If users are not satisfied with Vigorexin, they can contact customer support within 90 days of purchase day for a full refund (minus shipping). The guarantee is good for 1 used bottle and any unused bottles in a resalable condition.
Does Vigorexin Cause Side Effects?
The company says there aren’t any side effects reported from Vigorexin use, but I did find some side effects associated with horny goat weed in high dosages. Luckily, the dosage in Vigorexin isn’t high enough, except if you exceed the recommended dosage. If you exceed the recommended dosage you may experience the following: 
• Dry Mouth
There are testimonials listed on the official manufacturer website, Vigorexin.com. These reviews may be subject to bias. Here’s a look at what some users have to say about their Vigorexin experience:
“For the first time since my honeymoon we are having sex multiple times per day and there is no way I could do it without Vigorexin. I think everyone should give it a try.” –Chase
“If you really want one awesome full erection, a boost in libido and a delay in orgasm, this is the answer.” –Hunter
“I am able to last long enough to get her to climax. I’m just so happy that I found out about it.” –Trevor
Vigorexin is an good male enhancement supplement. The testimonials on the official website are supportive of this as well as testimonials found on third-party sites.
There is no doubt Vigorexin is formulated with effective ingredients. My only concern is the unknown amounts. Truth be told, if you have a formulation that works, you would want to protect your research and intellectual property, so I can understand the use of a proprietary blend.
At the end of the day, Vigorexin contains good ingredients and is an excellent choice.
 “Zinc:Dietary Supplement Fact Sheet.” Office of Dietary Supplements, National Institutes of Health.
 Colagar AH, Marzony Et, Chaichi MJ. “Zinc levels in seminal plasma are associated with sperm quality in fertile and infertile men.” Nutr Res. 2009 Feb;29(2):82-8. Doi: 10.1016/j.nutres. 2008. 11.007. Available from: http://www.ncbi.nlm.nih.gov/pubmed/19285597
 Prasad AS et al. “Zinc status and serum testosterone levels of healthy adults.” Nutrition 1996 May; 12(5):344-8. Available from: http://www.ncbi.nlm.nih.gov/pubmed/8875519
 Moh Ismail Bin Mohd Tambi, M. Kamarul Imran. “Eurycoma longifolia Jack in managing idiopathic male infertility.” Asian Journal of Andrology (2010) 12:376-380. Available from: http://www.readcube.com/articles/10.1038/aja.2010.7?locale=en
 Zhang ZB, Yang QT. “The testosterone mimetic properties of icariin.” Asian J Androl. 2006 Sep;8(5):601-5
 “Impotence.” NYU Langone Medical Center. Available from: http://www.med.nyu.edu/content?ChunkIID=21720
 Milasius K, Dadeliene R, Skernevicius J. “The influence of the Tribulus terrestris extract on the parameters of the functional preparedness and athletes’ organism homeostasis.” Fiziol Zh. 2009; 55(5):89-96.
 “Horny Goat Weed.” WebMD. Available from: http://www.webmd.com/vitamins-supplements/ingredientmono-699-HORNY%20GOAT%20WEED.aspx?activeIngredientId=699&activeIngredientName=HORNY%20GOAT%20WEED