What to take before drinking
If you know you're drinking tonight and you're thinking ahead, you have time to do something most people don't: raise your clearance capacity before it's stressed. The best pre-drinking intervention is the one that needs the lead time — sulforaphane.
What is happening
The ranked answer
1. Sulforaphane, 1–2 hours ahead. This is the only ingredient in the protocol that operates through gene induction. Taken with enough lead time, it upregulates ALDH2 and glutathione synthesis enzymes before the ethanol load arrives. Skipping this window is the single biggest missed opportunity in hangover prevention.
2. L-cysteine, 30 minutes ahead. Preloading a chemical trap means the first wave of acetaldehyde has somewhere to go on contact. The Eriksson 2020 trial protocol tested a preloading dose and found a benefit — this is human RCT evidence.
3. DHM preload. Gets the accelerated-clearance mechanism running from the first drink rather than playing catch-up.
4. NAC and silymarin. Bank the glutathione and CYP2E1-suppression mechanisms ahead of time so the liver has them ready.
5. Benfotiamine and magnesium. Cofactor buffers. Small individual contribution but they prevent the cofactor depletion that hobbles everything else.
Ingredients that address this, ranked
- Sulforaphane Tier 1 · Core Impact: high — Nrf2 activator; upregulates ALDH2 before drinking.
- L-Cysteine Tier 1 · Core Impact: high — Chemical trap for acetaldehyde at the source.
- DHM (Dihydromyricetin) Tier 1 · Core Impact: high — Accelerates alcohol clearance; blunts GABA rebound.
How tiers compare for this mechanism
| Goal | Best (Tier 1) | Strong support (Tier 2) | Situational (Tier 3+) |
|---|---|---|---|
| Acetaldehyde clearance | Sulforaphane, L-Cysteine, DHM (Dihydromyricetin), NAC (N-Acetyl Cysteine) | ||
| Glutathione support | Sulforaphane, L-Cysteine, NAC (N-Acetyl Cysteine) | Silymarin (Milk Thistle) | |
| Liver protection | Sulforaphane, L-Cysteine, DHM (Dihydromyricetin), NAC (N-Acetyl Cysteine) | Silymarin (Milk Thistle) | |
| Neurotransmitter modulation | DHM (Dihydromyricetin) | ||
| Ros mitigation | Silymarin (Milk Thistle) |
Deeper science · In more detail
What doesn't work pre-drinking
- A big meal alone. Food slows alcohol absorption but doesn't
reduce total acetaldehyde exposure.
- B vitamins alone. The idea isn't wrong, but alone they're
nowhere near sufficient.
- "Hangover prevention" gummies. Almost universally sub-dose
marketing products.
The full preflight stack is at Preflight.