Kamagra oil jelly contains sildenafil citrate, the same active ingredient found in Viagra, which is a well-established and effective treatment for erectile dysfunction (ED). In terms of functionality, the product does work for many men who have ED. It improves blood flow to the penis when sexually aroused, helping to achieve and maintain an erection. Kamagra oil jelly is often sold through unregulated sources, which increases the chance of buying a counterfeit or fake product. Counterfeit versions may not contain the correct amount of sildenafil, or they might contain dangerous substances.