Ashwagandha or Rhodiola rosea?

Both items are reviewed in the reference. Below their characteristics sit side by side as the studies describe them. This is a comparison of data, not advice on what to choose.

	Ashwagandha	Rhodiola rosea
evidence level	B	B
Sources in the review	3	1
Category	Recovery	Health
Goals	Strength, Mass	Endurance, Strength
Dosage	300-600 mg of standardized root extract per day, in a course of 8-12 weeks. The withanolide content of the product must be checked.	Acute dose — about 200 mg of extract (approximately 1% salidroside and 3% rosavin) 60 minutes before exercise. Recent studies used 1500–2400 mg/day for 4–30 days. Doses and standardization differed by dozens of times.
When to take	One or two doses per day, often with food; some studies used intake before sleep.	Acute intake — 60 minutes before exercise; course intake — daily for 4–30 days. There is little data on accumulation of the effect.

The conclusion from the data. In the reference «Ashwagandha» Level B and 3 sources, while «Rhodiola rosea» — Level B and 1. A higher level means the effect is better supported by research, not that the item suits you better.

Verdicts

Ashwagandha

A modest effect on strength; the studies are small and heterogeneous

Rhodiola rosea

The most consistently studied adaptogen, but the study results diverge

Sources for both items

Other comparisons

Creatine monohydrate or Creatine HCl Creatine monohydrate or Creatine nitrate Whey protein or Casein protein Whey protein or Pea protein Pea protein or Rice protein Soy protein or Whey protein BCAA (branched-chain amino acids) or Essential amino acids (EAA) Citrulline malate or Arginine