BETAINE AKA TRIMETHYLGLYCINE OR TMG
There are two types of betaine. Betaine HCL and betaine TMG. The HCL form is usually taken for low stomach acid and the TMG for athletic performance (but I think both types would work for that). This supplement has been given to livestock for years to keep them healthy, lower their feed to weight ratio and eliminate vet bills. It is extremely cheap and perhaps the reason it is over looked. It was originally a waste product left over from processing sugar. In other words one of the good things they took out of it in order to make it a poison void of any nutrition what so ever.
In addition to it's health benefits and disease prevention it gives more endurance, strength and stamina.
I would call it perhaps the second most underrated supplement. There are no long term negative effects and it has been well documented by it's use in animal feed to be safe and effective.
The only drawback to it, is that it gives bad breath, especially in higher doses (Really bad!) and was the reason I quit taking it.
I would consider taking it again and have tons of it laying around.
Malic acid is supposed to get rid of bad breath so perhaps taken together it might help with that. It's odd how a substance that has no taste (slightly sweet) or smell, can give such bad breath. It's probably from all the toxins it removes from the body. Unfortunately it removes a lot of them through the breath. Maybe that's the other reason it isn't such a popular supplement. If I do take it again I will limit my consumption to under a teaspoon per day because of this.