In this study, 78 patients aged 25 to 50 suffering from mild to moderate erectile dysfunction were given this supplement. This study lasted 12 weeks and the size and duration of the erection was the focus of the study. At the conclusion of the study, it was determined that this supplement made a significant difference compared to the controls on parameters like sexual desire, intercourse satisfaction, orgasmic function and overall satisfaction. Side effects were mild and similar to those observed in the control group. Once the trail finished, 90 percent of those taking the VXP supplement wished to continue taking the product because of the impact they observed. 
Ancient Incans consumed this energizing Peruvian plant, says Chris Kilham, an ethnobotanist at the University of Massachusetts at Amherst. Maca increases sexual appetite, stamina, endurance and fertility. One 2008 study conducted at the Depression Clinical and Research Program at Massachusetts General Hospital in Boston found that maca helped people with antidepressant-induced dysfunction to regain their libidos. Check out 25 more Secret Superfoods for Weight Loss right here!
Yohimbine is an indole alkaloid derived from the bark of the African yohimbe tree (33). Yohimbine has been noted to treat fatigue, depression, diabetes, and sexual dysfunction. A meta-analysis of seven placebo-controlled trials (34) deemed yohimbine superior to placebo for the treatment of ED with rare adverse events. The proposed mechanism of action (35) is via the inhibition of central alpha-2-adrenergic receptors, decreasing central inhibition of arousal, and increasing penile nerve stimulation resulting in increased NO. Common side effects include headache, sweating, agitation, hypertension and insomnia. Contraindications include patients on tricyclic antidepressants, anti-hypertensives and central nervous system stimulants.
There’s no bedroom bummer quite like having to fly at half mast, but your penis problems are likely more common than you think: As many as 30 million American men suffer from erectile dysfunction, and one in four who seek treatment for ED are actually under the age of 40, according to a study in The Journal of Sexual Medicine. We all know there’s a little blue pill that can fix the failure to launch—but you don’t necessarily have to fill a ‘script to save your stiffy.
In a study done to determine if vitamin D supplementation would actually help patients with ED, 143 patients with ED were tested to determine vitamin D levels. It was found that of these cases, 46 percent of patients suffered from substantial vitamin D deficiency and only 20 percent were found to have adequate levels of vitamin D. In these cases, it was also determined that inadequate arterial blood flow was the root cause of ED more commonly in patients with low vitamin D levels.  Vitamin D supplementation can improve both these parameters.