Quick answer: L-carnitine helps carry fats into cells to be burned for energy, and trials in older men used 2 to 4 g a day. Rhodiola is an adaptogen with mixed-quality trials on stress-related fatigue at 200 to 600 mg. Neither is a stimulant.
L-carnitine
Your body makes carnitine, and meat supplies more. Supplements may help when levels are low. It may reduce the effect of thyroid medicine. NIH ODS on carnitine.
Rhodiola
Some trials found less tiredness and better concentration under stress. It can cause dizziness or dry mouth. NCCIH on Rhodiola.
What to expect
No caffeine-style buzz. If anything, a gradual change over weeks.
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General information, not medical advice. Jelly Rock is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease.