Comparison
DHEA vs L-Theanine
Side-by-side of DHEA and L-Theanine. Every row below is pulled from the compound schema and will update as our data grows. For deeper reads, follow through to each compound page.
DHEA
DHEA supplement profile: adrenal androgen precursor, typical 25-50 mg dose, DHEA-S targets, evidence for adrenal insufficiency and vaginal atrophy, side effec.
L-Theanine
L-theanine is a non-protein amino acid found in tea leaves. The most-replicated nootropic; pairs with caffeine at 1:1 (100-200 mg each) for acute focus.
Effects at a glance
DHEA
- •Adrenal androgen precursor; serum DHEA-S declines progressively after the third decade of life
- •OTC dietary supplement in US under DSHEA 1994; prescription in EU, UK, Canada, Australia
- •FDA approved as Intrarosa (6.5 mg vaginal insert) for postmenopausal dyspareunia in 2016
- •Acts as tissue-specific prohormone converted intracrinologically to testosterone and estrogens
- •Best evidence: adrenal insufficiency replacement and vaginal atrophy; weaker on cognition and longevity
- •WADA banned in competitive sport; banned in NCAA, MLB, NFL, IOC settings
L-Theanine
- •Non-protein amino acid in tea; the most-replicated nootropic in the human RCT literature
- •Caffeine + theanine at 1:1 (100-200 mg each) is the gold-standard acute focus stack
- •Solo doses of 200-400 mg reduce subjective stress and improve sleep quality
- •Increases alpha-wave EEG activity within 30-45 minutes of 200 mg oral dose
- •Crosses blood-brain barrier; bioavailability high, half-life 60-90 minutes
- •Clean safety record; minimal interactions at supplement doses
Side-by-side
| Attribute | DHEA | L-Theanine |
|---|---|---|
| Category | hormone | supplement |
| Also known as | dehydroepiandrosterone, prasterone, Intrarosa | theanine, gamma-glutamylethylamide |
| Half-life (hr) ↗ | 12 | 1.5 |
| Typical dose (mg) ↗ | 25 | 200 |
| Dosing frequency | daily, typically morning | as needed (with caffeine) or daily |
| Routes | oral, vaginal, topical | oral |
| Onset (hr) | 1 | 0.5 |
| Peak (hr) | 1 | 1 |
| Molecular weight | 288.42 | 174.2 |
| Molecular formula | C19H28O2 | C7H14N2O3 |
| Mechanism | Steroid prohormone converted intracrinologically to testosterone and estrogens in target tissues; also exerts direct effects via sigma-1 receptor, GABA-A modulation, and glucocorticoid receptor interaction. | Crosses BBB; modulates GABA/dopamine/serotonin (modest); increases alpha-wave EEG activity; dampens stress-induced sympathetic response without sedation. |
| Legal status | OTC supplement in US (DSHEA 1994); prescription in EU, UK, Canada, Australia | OTC dietary supplement |
| WADA status | banned | allowed |
| DEA / Rx | OTC supplement in US (not scheduled); Rx in EU, UK, Canada, Australia | OTC supplement |
| Pregnancy | Contraindicated in pregnancy | Insufficient supplement-dose data; tea-source intake safe |
| CAS | 53-43-0 | 3081-61-6 |
| PubChem CID | 5881 | 439378 |
| Wikidata | Q411733 | Q909931 |
Safety profile
DHEA
Common side effects
- acne
- oily skin
- hirsutism (women)
- gynecomastia (men, higher doses)
- irritability
- insomnia
Contraindications
- hormone-sensitive cancer (breast, ovarian, prostate)
- active liver disease
- uncontrolled lipid disorder
- pregnancy and lactation
Interactions
- warfarin: case reports of altered INR; monitor(moderate)
- estrogens (HRT): additive estrogenic effect via conversion; monitor(moderate)
- insulin: may improve insulin sensitivity slightly; monitor glucose(minor)
- anastrozole: may reduce DHEA-derived estrogen; clinical relevance unclear(minor)
L-Theanine
Common side effects
- mild GI upset (rare)
- headache (rare)
Contraindications
- pregnancy / lactation (insufficient data at supplement doses)
- concurrent strong GABAergics without caution
Interactions
- caffeine: synergistic for acute focus; dampens jitter without blunting alertness(minor)
- benzodiazepines / alcohol: potential additive sedation(minor)
Which Should You Take?
L-Theanine comes out ahead for most readers on the criteria we weight: 3 catalogued goals, OTC dietary supplement, oral dosing, with a Tier-A outcome catalogued. DHEA is the right call when one of the conditionals below applies.
- → If your priority is hormonal optimization, pick DHEA.
- → If your priority is healthspan extension, pick DHEA.
- → If your priority is focus or working memory, pick L-Theanine.
- → If your priority is stress and HPA-axis regulation, pick L-Theanine.
Edge case: DHEA is contraindicated in pregnancy; L-Theanine is the safer pick if that applies.
Default choice: L-Theanine. Lower friction to source, a Tier-A evidence outcome catalogued, and broader goal coverage. Reach for DHEA only if your priority sits squarely in the goals it owns above.
This verdict is generated from each compound's schema (goals, legal status, evidence outcomes, dosing route). It updates automatically as our compound data evolves; the deeper read sits on each individual compound page.
Common questions
What is the difference between DHEA and L-Theanine?
DHEA and L-Theanine differ in category (hormone vs supplement), mechanism, and typical dosing. See the side-by-side table for full details.
Which has a longer half-life, DHEA or L-Theanine?
DHEA half-life is 12 hours; L-Theanine half-life is 1.5 hours.
Can you stack DHEA with L-Theanine?
Stack compatibility depends on mechanism overlap, legal status, and individual response. Check each compound page for specific interactions and contraindications before combining.
Go deeper