Since this only has 5 mg of spermidine in it, I need to take two of these a day to achieve my normal 10 mg of spermidine each day. That makes this a really expensive supplement for me.I normally take NAD and ergothioneine and spermidine all separately, so if this combined all three at the same doses that are normally recommended, for a month supply, this might be a supplement worth considering, but these seem to be lower doses of each of those ingredients.I don't usually rate supplements based on price, but since it would cost $300/month for me to get my usual amount of these ingredients, I think this might be a bit too expensive for the average person, especially if you also take any additional supplements. I wish the price could be brought down significantly because this seems like it would be a great formula for those who have trouble swallowing.My other concern is that this doesn't seem to be independently tested for quality or purity, which means we only have the manufacturer's word for how much of these ingredients is actually contained in this formula. I can get each of these ingredients from a high quality, third-party tested source for half this amount so this only makes sense if you really need your supplements in liquid form.NAD is the only ingredient in this that I can see immediate results from, it does give me more energy for working out on the same day I take it. When I first started taking spermidine, it took about a month to start seeing noticeable results, so those new to spermidine might not see results taking this short term since this is only a 7-14 day supply. I've never seen results from taking ergothioneine but I still take it because the anti-aging research is so intriguing that I hope it will help in the long run.