herb · for afternoon energy crash
Rhodiola
Helps your cells recycle energy and smooths the cortisol dip that causes the slump.
Say that in clinical terms
Rhodiola increases the efficiency of ATP synthesis and recycling, enhances cellular oxygen utilization, and modulates cortisol patterns to prevent the exaggerated afternoon cortisol decline that contributes to energy crashes.
How strong is the research?
4 papers read, 2 supporting.
Who was studied: Doctors on night shifts during sleep deprivation, not an ordinary afternoon dip.
How much to take
daily in the morning
200–400 mg
Take in the morning for sustained energy throughout the day. Adaptogenic effects buffer afternoon cortisol dip.
Before you take it
- No Tolerable Upper Intake Level (UL) has been established by NIH ODS for Rhodiola rosea — it is an herbal supplement without a formal UL; NCCIH considers it possibly safe for up to 12 weeks at studied doses (typically 200–600 mg/day).
- Safety in pregnancy and lactation is unknown; NCCIH states 'little is known about whether it is safe to use rhodiola during pregnancy or while breastfeeding'; clinical use during these periods should be avoided.
- In vitro inhibition of CYP3A4 and CYP2C9 confirmed (MSK Integrative Medicine); may reduce clearance of drugs with narrow therapeutic index metabolized by these enzymes, including warfarin, phenytoin, immunosuppressants, and antiretrovirals; clinical significance in humans is not formally established.
- Inhibits P-glycoprotein (P-gp) in vitro (MSK); may alter bioavailability or plasma concentrations of P-gp substrate drugs.
- MAO-A and MAO-B inhibitory activity demonstrated in vitro; avoid concurrent use with MAOIs; exercise caution when combined with SSRIs, SNRIs, or other serotonergic agents — a case report documented tachyarrhythmia in a patient combining Rhodiola with antidepressants.
- Interaction with losartan (an antihypertensive) has been reported by NCCIH; caution is warranted in patients on blood pressure medications.
- Common adverse effects at studied doses: dizziness, dry mouth, headache, and insomnia.
- No clinical safety data exist beyond 12 weeks of continuous use.
When to take it
Best taken: morning
What we make of it
The trial was about night-shift performance, which is a different problem.
The detail
The study measured how doctors performed on night duty. That is about sleep deprivation, not the body-clock dip people feel in the afternoon — which no trial has measured.