Life ExtensionMitochondrial Energy Optimizer with PQQ – For Heart & Brain Health, Energy Management and Anti-Aging - Gluten-Free, Non-GMO, Vegetarian – 120 Capsules

Excellent supplement! This is a huge help with tendon health and energy. I'm a 60 year old runner and need all the help I can get. I have tried 2 different supplements and this is by far my favorite. It is a little more costly... but worth it for the way I feel.

I started to take these to help with the loss of energy from a medication I am taking and it has really helped. I take 4 first thing in the morning on an empty stomach and I feel like I have more energy all day even in the evening. I forgot to take it the other day and couldn’t figure out why I was struggling to stay awake that evening then I realized I had forgotten it! Definitely notice a difference!

I noticed a difference with these. I was playing a match memory game with my kid. Before taking this we tied or were very close in score. After taking this I am able to win every time. Not why most would want to take this but the only evidence I saw that it worked.

Good quality

This work but you will not notice the difference until 45 to 60 days later. Then all of a sudden you will notice you are loosing weight fast! I experimented 3 times and this was true each time I used restarted taking this!

Taking the full dose caused a giant migraine, taking a half dose caused me not to sleep soundly for nearly a week. I don't recommend this if you struggle with anxiety or cortisol issues.

I've bought this supplement stack many, many times before, taking breaks only due to my relative lack of discretionary income. So long as the price holds at about this level, I think this time I'm sticking with for good.I've been struggling with extremely low energy (mental and physical) for some time, something that's resulted in every conceivable blood test and procedures ranging from and EEG to an MRI. Yes, something IS wrong according to the experts -- precisely what is wrong, and exactly how to fix it, has led on a campaign about as productive as trying chasing leprechauns over rainbows in search of a pot of gold. LEF Mitochondrial Energy Optimizer has helped abate the symptoms, to the point, raise my overall energy level and abate the pain somewhat. And this is far in excess of what anything prescribed has accomplished. Mind you, this doesn't happen overnight. However, given 10 days to two weeks, I feel improved. Flip side, it takes five days off before I feel ... unimproved.I've reviewed at least one other LEF supplement, and I'll make the same assertion in support of this product. Check out the ingredients, then try to find out how much it would cost to purchase them individually. I must say that I'm a little bummed out that they eliminated Acetyl Carnitine. However, the stack holds up nonetheless.Few -- very few -- composite stacks available here or elsewhere hold up to their promise. To the point, most provide one "all star" ingredient, then add inferior forms of other nutraceuticals included to support it (i.e. non-methylated/ non-biologically active forms of B vitamins) or include them in amounts far below the therapeutic doses.LEF is a great company, and I'd encourage anyone interested to check out their online magazine. I should note I'm not affiliated, nor am I receiving anything in return for this review. Rather, I try to do some homework prior to buying any supplement. And having kept up with their publication for some time, I'm more than sufficiently convinced they are very much on the level (to say the least).

This product is amazing I don't intake this everyday but when I need it I use it and keeps me awake energized and ready togo all day. I don't think having this everyday is ideal so I recommend use when needed. But it does work very well.