Supplements: Pre-Workout Supplement Timing Guide
Caffeine plasma concentration peaks 60-90 minutes after ingestion (McLellan 2016, PMID 26920240). Sodium bicarbonate blood alkalosis peaks ~90 minutes post-ingestion. Dietary nitrates (beetroot) need 2-3 hours.
| Measure | Value | Unit | Notes |
|---|---|---|---|
| Evidence Tier | 1–2 | tier | Tier 1 for caffeine and creatine efficacy; timing optimization is Tier 2-3 level detail |
| Caffeine Peak Plasma | 60–90 | minutes post-ingestion | Take 60-90 min before training for peak plasma at session start |
| Citrulline Timing Window | 30–60 | minutes pre-exercise | Plasma arginine peaks 60-90 min post-citrulline ingestion; 30-60 min pre-workout is adequate |
| Dietary Nitrate Lead Time | 2–3 | hours | Beetroot juice or nitrate supplements require longest lead time for blood nitrite peak |
| Beta-Alanine Timing | any | time of day | Timing irrelevant; chronic muscle carnosine saturation over 4-6 weeks drives the benefit |
| Sodium Bicarbonate Timing | 60–90 | minutes pre-exercise | Blood alkalosis peaks ~90 min post-ingestion; take with food to reduce GI distress |
Most pre-workout timing advice focuses on capsule/powder absorption windows. The practical reality: only a few ingredients have meaningfully different effects based on timing, while others (beta-alanine, creatine) are entirely timing-agnostic.
The Pharmacokinetic Logic
Each supplement has a characteristic time-to-peak effect based on absorption, distribution, and conversion to active metabolites. Aligning supplement intake with training ensures peak plasma concentration coincides with the session rather than occurring during warmup or post-training cooldown.
Timing Reference Table
| Supplement | Optimal Timing Pre-Exercise | Peak Effect Window | Timing Flexibility | Notes |
|---|---|---|---|---|
| Caffeine | 60-90 min | 60-120 min post-dose | Low — timing matters | Capsules need full 90 min; coffee variable due to fat/food |
| Citrulline | 30-60 min | 60-90 min post-dose | Moderate | Plasma arginine peak at 60-90 min |
| Beta-Alanine | Any time of day | Chronic (weeks) | High — timing irrelevant | Split doses to reduce paresthesia |
| Creatine | Pre or post workout | Chronic (weeks) | High — any time adequate | Consistency matters; timing is minor variable |
| Betaine | 30-60 min | 60 min post-dose | Moderate | Plasma betaine peaks ~60 min |
| Sodium Bicarbonate | 60-90 min | ~90 min post-dose | Low — GI timing also matters | Take with food; 0.3g/kg dose |
| Dietary Nitrates (beetroot) | 2-3 hours | 2-3 hours post-dose | Low — requires planning | Longest lead time of any common supplement |
| HMB | 30-45 min | ~60 min post-dose | Moderate | Anti-catabolic acute use; chronic use more important |
| Protein | Within 1-2h of training | Ongoing (leucine trigger) | High | Total daily intake >> timing |
Practical Timing Protocol
For a morning session with training starting at 7:00 AM:
- 5:30 AM: Dietary nitrates (beetroot concentrate) if using
- 5:30-6:00 AM: Sodium bicarbonate with food (if using)
- 6:00 AM: Caffeine + citrulline + pre-workout stack
- 7:00 AM: Training begins at caffeine peak; citrulline also peaking
- Beta-alanine and creatine: take any time during the day — the morning dose is fine but timing doesn’t change the effect.
The key insight: caffeine and dietary nitrates are the only pre-workout supplements where timing precision significantly affects outcome. Everything else is flexible.
Related Pages
Sources
- McLellan TM et al. A review of caffeine's effects on cognitive, physical and occupational performance. Neurosci Biobehav Rev. 2016;71:294-312.
- Antonio J, Ciccone V. The effects of pre versus post workout supplementation of creatine monohydrate on body composition and strength. J Int Soc Sports Nutr. 2013;10:36.
- Jones AM. Dietary nitrate supplementation and exercise performance. Sports Med. 2014;44 Suppl 1:S35-45.
Frequently Asked Questions
Should I take creatine before or after my workout?
The timing debate for creatine is largely resolved: both pre and post workout timing are effective, and any timing advantage between them is small compared to the effect of consistent daily supplementation. A 2013 study by Antonio found post-workout creatine had a slight edge for body composition, but the difference was minor. Take it whenever you will remember to take it consistently.
How early should I drink beetroot juice before working out?
Dietary nitrates from beetroot need 2-3 hours to be converted to active nitric oxide via the enterosalivary cycle. Drinking beetroot juice 30 minutes before training — as many do — misses the plasma nitrite peak. Plan 2-3 hours ahead or use a high-dose concentrate 90+ minutes before training.
Does taking beta-alanine pre-workout vs other times matter?
No. Beta-alanine's performance benefit comes from chronic carnosine loading in muscle tissue over 4-6 weeks at 3.2g/day. The timing of any single dose does not affect carnosine accumulation. Take it whenever is convenient, though some people split doses to reduce the harmless tingling (paresthesia) side effect.
What happens if I take caffeine too close to my workout?
Taking caffeine 15-30 minutes before training means you start your session before plasma levels peak. Caffeine is still rising during your warmup, potentially delivering peak stimulant effect mid-workout rather than at the start. Capsule or tablet caffeine has slower absorption than liquid; for capsules, 60-90 minutes allows reliable peak timing.
Is there a best time to take protein around training?
The 'anabolic window' of strict 30-minute post-workout protein timing is largely a myth at adequate total daily protein intake. As long as you consume a protein source containing 2-3g leucine within 1-2 hours before or after training, muscle protein synthesis is maximally stimulated. Total daily protein (1.6-2.2g/kg) matters far more than precise timing.