Table tennis rewards strength and endurance just as many sports do. It is always a dangerous thing to say something like "the benefits of doping in table tennis are not very remarkable" - the benefits of doping in any activity are not remarkable, they just make it easier to train much harder and get more rewards from training harder, and that is essentially the problem.
They could use natural source e.g. kratom for this. Google says “At low doses, it acts as a stimulant.” Kratom / mitragynine does not appear to be on WADA’s 2026 Prohibited List as a banned substance
Kratom – scientifically, it is referred to as
Mitragyna speciosa.
Plant Family: Rubiaceae (the coffee family)
Native Region: Indigenous to Southeast Asia
Traditional Use: The leaves have historically been boiled into a beverage or chewed to combat fatigue and act as a traditional medicine
to treat pain, fever, and diabetes.
✅ Effects: At low doses, it acts as a stimulant; at higher doses, it can have sedative and opioid-like effects.