It is very difficult for me to say that a single nutrient has been effective and beneficial to me. I haven't performed any baseline or current tests to definitively prove this. Another factor is that I use a multimodal approach when it comes to my health.
However, what I can say is I have been with Life Extension for ten years now and I believe they have everyone's best interests at heart. They believe in science and quality and it shows in their products. Take their Omega 3 product, for example. While I have found a few products have more DHA in them, I have yet to find any product that has all of the ingredients Life Extension has put into theirs. They are there for a reason, from preventing spoilage to increasing the efficacy. The citations back it up.
It is important to me to use a three pronged approach when it comes to my health. One, to have a good baseline of nutrients and hormones. This includes daily vitamins, CoQ10, NAD+, AMPK and omega 3 just to name a few. Two is to have a good diet (I also do the daily extended fasting), especially limiting simple carbs and sugars, and three is to do exercise (Protocols that Life Extension advocates).
However, I can say without any doubt that my life has changed for the better since I have been taking products from Life Extension. I am more energetic, not as prone to the cold as others and feel more happy overall. I believe they have everyone's best interests at heart to live a longer and more productive life.