Many companies neglect D-aspartic acid's role as a potential excitotoxin (causes neuron damage) when ingested at high doses [16], [17]. This is why it is not used.
Tribulus terrestris, yohimbine, maca, horny goat weed, and ginkgo biloba have very little clinical backing to support their effectiveness and they have also been reported to cause mood changes, anxiety, hallucinations and addiction in a number of cases [18],[19]. This is why we don't use them.