I have both Ashwagandha and Jiaogulan. I have read some customer reviews of people getting the opposite reaction with Ashwagandha (increased BP and rapid heart beat)and so I've been reluctant to suggest that he take it.
This would only happen with allergies to the herb. Allergic responses result in an increase of epinephrine (adrenaline) that speeds up and strengthens the heart contractions.
He is overweight, but he is a strong, hard worker and he gets more done than most people I know.
Coleus also helps with weight loss not only by supporting thyroid function, but also by stimulating brown adipose tissue (BAT) to burn white adipose tissue (WAT). Same principle as the use of ephedrine to stimulate BAT, but with a lowering of blood pressure instead of an increase in blood pressure.