Saw palmetto is an herb that has traditionally been used to treat conditions like benign prostatic hyperplasia (BPH), which is a non-cancerous inflammation of the prostate gland. Supposedly, saw palmetto increases testosterone production, and for this reason many men try it in hopes of gaining better erections. The problem with saw palmetto tea is that the fatty acids that make up the herb’s active ingredients aren’t soluble in water, and tea hasn’t been tested in any scientific studies. Like other herbal teas for erectile dysfunction, if it’s going to work, it can take several weeks of regular consumption for changes to become evident.