Gorilla Mind Gorilla Mode AR Androgen Receptor Upregulator Highlights: Gorilla Mode AR (androgen receptor) is our L-Carnitine L-Tartrate formula that can be used for androgen receptor upregulation and fatty acid mobilization. Given the low oral bioavailability of L-Carnitine it's important to note that the upper range of dosing should be considered in order to mimic the effects of an intramuscular injection. This will ensure you are getting the maximum effects and achieving the most results.