I will start by briefly describing what I found out during my research on the Internet and then go back to my own XtraSize experience, which has been going on for several years now.
Tribulus Terrestris: Well-known in the world of weight training as an effective testosterone booster, ever popular within the supplement industry. The studies carried out on this herb are not clear, but the surprising efficacy of this herb has been well described all over the Internet. If it is possible to increase your testosterone levels with this ingredient minimally, then the effect on the penis, more precise on an enlargement of the same, is not to be despised – this is confirmed by my experiences from personal reviews (study).
Maca Root: Again, this is a plant that is said to increase testosterone levels. As already mentioned in the Tribulus, there seems to be a connection between the testosterone level and penis size (source) – this would also help improve erection. Since Maca is also rated quite well in 99% of all cases, this plays a not inconsiderable role (study).
Saw palmetto extract: The saw palmetto has been proven to be a natural DHT inhibitor – although only to a limited extent, it is theoretically helpful… the question is: What is the point? DHT is a testosterone derivative and the hormone that ultimately works and turns a man into a man – if you have less of it, Libido and Co. A reduction in DHT levels can be useful for prostate problems and hair loss and may increase testosterone levels.
Arginine: Some of you will know this amino acid from my article on improving erection. It really helps, and therefore it is evident that there is also a dose of XtraSize ingredients among the XtraSize ingredients – besides, this effect also has something to do with enlarging the penis: More blood in the penis = more volume – sounds logical.
Rating & Conclusion: These were not all ingredients yet (The complete list you can find here: ▷ to the manufacturer’s page), but the list goes on exactly the same way: Various natural ingredients that are directly related to the enlargement of the erection or to the topic potency in general. All these ingredients are available in a dosage appropriate to their purpose. Even if it gets your alarm bells ringing before buying such a product – the ingredients leave a significant and severe impression, they are natural, and the product is much cheaper than an operation or any medication. And apparently without side effects? It’s worth a try!