Testofen is a brand name for a fenugreek extract, and the page marketed it for vitality.
Fenugreek is a seed used as a spice and traditional herb. A branded extract indicates a defined preparation, which is better than an unspecified one. The page does not state the amount per gummy or a standardization figure for this ingredient.
Vitality is a broad word and does not describe a specific effect.
Fenugreek is a legume, so people with allergies to peanuts or chickpeas should be careful. It is also discussed for effects on blood sugar and can interact with some medicines. Ask a doctor or pharmacist if you take diabetes or blood-thinning medication, and look for the exact name on the label.