Supplement
Stack Builder
Select supplements by training goal, see real-time synergy analysis, and export your personalised daily timing protocol. Click any card to add or remove from your stack.
Why Supplement Timing Matters
Supplement timing is not pseudoscience — it is rooted in pharmacokinetics (absorption curves), physiological context (hormonal windows), and substrate availability. Consuming the right supplement at the wrong time can reduce effectiveness by 40–80% or, in some cases, actively counteract training adaptations.
Building Your Foundational Stack
A well-designed supplement stack addresses multiple performance pathways simultaneously — energy, pump, recovery, and health — with each supplement occupying a distinct mechanistic role. The most effective stacks are those where every ingredient serves a non-redundant function.
| Layer | Purpose | Primary Supplements | Priority |
|---|---|---|---|
| Foundation | Health, hormone support, recovery base | Vitamin D3+K2, Omega-3, Magnesium Glycinate, Zinc | Highest |
| Performance | Acute training enhancement | Creatine, Beta-Alanine, Caffeine, Citrulline | High |
| Recovery | Muscle repair, adaptation support | Whey Protein, EAA, HMB, Ashwagandha | Medium-High |
| Cognitive | Focus, mind-muscle connection | Alpha-GPC, L-Theanine, Rhodiola | Medium |
| Metabolic | Body composition, glucose management | Berberine, Caffeine (fat oxidation) | Situational |
The 18 Supplements — Evidence Rankings
Each supplement in this builder is ranked by the strength of evidence for its primary performance benefit. This allows you to prioritise by evidence quality — not by marketing claim.
| Supplement | Primary Benefit | Evidence Level | Time to Effect |
|---|---|---|---|
| Creatine Monohydrate | Strength, power output, hypertrophy | Grade A — Overwhelming | 2–4 weeks (loading) or 4–6 weeks (no loading) |
| Caffeine Anhydrous | Power, endurance, fat oxidation | Grade A — Overwhelming | Acute (30–60 minutes) |
| Vitamin D3 | Testosterone, bone density, immunity | Grade A — Deficiency correction | 8–12 weeks for full repletion |
| Omega-3 (EPA/DHA) | Inflammation, cardiovascular, MPS | Grade A — Strong | 4–8 weeks for tissue incorporation |
| Whey Protein Isolate | Muscle protein synthesis | Grade A — Strong | Acute post-workout effect; 4–8 weeks adaptation |
| Beta-Alanine | High-intensity endurance (1–4 min) | Grade B — Good | 4–8 weeks for carnosine saturation |
| L-Citrulline | Pump, blood flow, endurance | Grade B — Good | Acute (60 minutes) |
| Magnesium Glycinate | Sleep, recovery, enzyme function | Grade B — Good (deficiency common) | 2–4 weeks |
| Ashwagandha KSM-66 | Cortisol, testosterone, sleep quality | Grade B — Growing | 8–12 weeks for full RCT-equivalent effect |
| Alpha-GPC | Power output (+14%), cognition | Grade B — Promising | Acute and cumulative |
| Berberine | Insulin sensitivity, glucose control | Grade B — Clinical-level evidence | 4–8 weeks |
| L-Theanine | Calm focus, caffeine synergy | Grade B — Good (combined) | Acute (30–60 minutes) |
Supplement Synergies & Interactions
The stack builder automatically detects synergistic combinations and potential conflicts. Understanding the mechanism behind each makes the recommendation more actionable.
✦ Caffeine + L-Theanine (Best Synergy)
The most well-documented supplement combination. Caffeine provides alertness and power; L-theanine (100–200mg per 100–200mg caffeine) smooths the stimulant edge, reduces anxiety, and sustains focus for longer. The combination produces superior sustained cognitive performance compared to either compound alone — at doses where caffeine alone causes jitteriness.
✦ Creatine + Whey Protein
The most studied post-workout combination for strength and hypertrophy. Whey’s rapid leucine delivery maximises the anabolic signal; creatine replenishes phosphocreatine stores and independently stimulates satellite cell activation. Combined post-workout supplementation produces greater lean mass gains than either compound alone across multiple 8–12 week RCTs.
✦ Beta-Alanine + Citrulline + Caffeine
The evidence-based pre-workout triad: beta-alanine addresses acid buffering (1–4 min work capacity), citrulline addresses blood flow and nutrient delivery (via nitric oxide), and caffeine addresses CNS drive and power output. Each targets a different limiting factor — making the combination mechanistically non-redundant.
⚠ Caffeine + Ashwagandha (Timing Conflict)
Ashwagandha’s cortisol-lowering effects are best expressed with evening dosing (when cortisol naturally falls). Taking it alongside morning caffeine (which raises cortisol acutely) may blunt the cortisol-modulating adaptation over time. The practical solution: take ashwagandha in the evening, caffeine as pre-workout only.
Optimal Stacks by Training Goal
These goal-specific stacks represent the strongest evidence-based combinations for each primary training objective — ordered by priority within each goal.
💪 Strength & Hypertrophy Stack
Core: Creatine Monohydrate (5g/day, post-workout) + Whey Protein Isolate (30–40g post-workout) + Vitamin D3+K2 (3,000–5,000 IU/day). Add: Beta-Alanine (3.2–6.4g/day split) + Zinc Bisglycinate (15–30mg/evening). Optional: Alpha-GPC (300–600mg pre-workout) for mind-muscle connection and acute power enhancement.
🏃 Endurance & VO2 Stack
Core: Caffeine (3–6mg/kg, pre-workout) + L-Citrulline (6–8g, pre-workout) + Electrolyte Complex (intra-workout) + EAA (10–15g intra-workout for sessions over 60 min). Add: Rhodiola Rosea (400mg, pre-workout) + CoQ10 (200mg with meals). Note: Beta-alanine is less effective for efforts >10 min; citrulline and caffeine have strongest endurance evidence.
🧠 Focus & Cognitive Stack
Core: Caffeine (100–200mg) + L-Theanine (200mg — always pair with caffeine at 1:1 or 2:1 ratio) + Alpha-GPC (300mg). Add: Rhodiola Rosea (200mg for mental fatigue resistance). Note: Ashwagandha adds stress resilience and can be stacked at different times (evening). This combination covers stimulant drive, sustained focus, and mental fatigue resistance from three distinct mechanisms.
🔥 Fat Loss & Body Recomp Stack
Core: Caffeine (3–6mg/kg — primary fat oxidation driver + appetite suppression) + Berberine (500mg 2–3× daily with meals — insulin sensitivity). Foundation: Omega-3 (2g+ EPA/DHA — anti-inflammatory, supports insulin sensitivity) + Vitamin D3 (3,000 IU — testosterone and metabolic health). Note: Creatine should be maintained during a cut to preserve strength and muscle mass.
Safety, Interactions & Who Should Consult a Doctor
The supplements in this builder are generally regarded as safe for healthy adults when taken at evidence-based doses. However, specific populations and conditions warrant medical consultation before use.
| Supplement | Consult Before Use If | Key Interaction | Safe for Most? |
|---|---|---|---|
| Caffeine | Heart condition, anxiety disorder, pregnancy, hypertension | MAOIs; other stimulants; certain medications | Yes — at moderate doses |
| Creatine | Kidney disease history | No significant interactions at standard doses | Yes — most researched sports supplement |
| Omega-3 | Blood thinning medication (warfarin, aspirin therapy) | Anticoagulants — may increase bleeding time at high doses | Yes — at 2–4g/day |
| Berberine | Diabetes medication, pregnancy, liver conditions | Metformin (additive effect); cyclosporine; P-glycoprotein substrates | Moderate caution — consult if on medication |
| Ashwagandha | Thyroid conditions (may alter thyroid hormones), pregnancy | Thyroid medication; immunosuppressants; benzodiazepines | Moderate caution |
| Beta-Alanine | No serious contraindications; split dosing reduces paresthesia | No significant drug interactions | Yes — tingling is normal, not harmful |
Cycling Protocols — When to Cycle Off
Not all supplements require cycling — but some produce tolerance (caffeine), receptor downregulation (adaptogenic herbs), or are simply more cost-effective with strategic breaks. Understanding which to cycle prevents tolerance and maintains effectiveness.
♾️ No Cycling Required
Creatine, Omega-3, Vitamin D3, Magnesium, Zinc, Whey Protein, EAA, Electrolytes: these are either substrate replenishment (creatine, electrolytes) or nutritional foundations (omega-3, D3, magnesium, zinc). Stopping them reduces the benefit; continuing them maintains it. No tolerance develops with continuous use.
⚡ Caffeine — Cycle Recommended
Caffeine tolerance develops within 3–5 days of daily use, requiring progressively higher doses for the same effect. Protocol: 5 days on / 2 days off is sufficient for most users. Alternatively, 4 weeks on / 1 week reduced (50% dose). A full 2-week break every 3–4 months restores full sensitivity. Morning-only dosing reduces tolerance development versus multiple daily doses.
🌿 Adaptogens — Pulse Protocol
Ashwagandha, Rhodiola: most RCTs use 8–12 week protocols followed by a 4-week break. Continuous use beyond 12 weeks without a break may reduce the cortisol-modulating response. Practical protocol: 8 weeks on, 4 weeks off, or 5 days on / 2 days off weekly (matching training week). Rhodiola may cause stimulation at high doses — avoid evening use.
💊 Berberine — Essential Cycling
Berberine should not be used continuously for extended periods without medical supervision. It affects AMPK, mitochondrial function, and gut microbiome. Recommended protocol: 8–12 weeks on, 4 weeks off. If using for insulin sensitivity during a fat loss phase, cycle with the phase. Long-term continuous use without cycling may reduce mitochondrial function — the opposite of the intended effect.
🏋️ HMB — Context Dependent
HMB (β-hydroxy β-methylbutyrate) is most effective during: caloric restriction phases, return from injury/detraining, and the first 8–12 weeks of a training programme (beginner effect). Its benefits attenuate significantly in experienced, well-fed athletes. Protocol: use during cuts or deload periods; cycle off during hypertrophy phases where protein intake is adequate (>2g/kg).
🔁 Beta-Alanine — Build & Maintain
Beta-alanine works by saturating muscle carnosine over 4–8 weeks of loading (3.2–6.4g/day). Once saturated, a maintenance dose of 1.6–3.2g/day maintains carnosine levels. Full depletion after stopping takes 6–10 weeks. Practical: load for 8 weeks before a competition block; maintain at half-dose; reload if a full break is taken.
Supplement Quality — What to Look For
The supplement industry is poorly regulated — a supplement can claim to contain 500mg of a compound while lab testing reveals 50mg or a different compound entirely. These quality markers identify products with verified composition and honest labelling.
✅ Third-Party Testing Certifications
Look for: NSF Certified for Sport (tested for banned substances and label accuracy — required for professional athletes); Informed Sport (UK equivalent); USP Verified; Labdoor testing score. These certifications mean an independent laboratory has verified the product contains what the label claims and is free from contaminants and banned substances.
✅ Patented Ingredient Forms
Specific trademarked ingredient forms have been studied in published research and guarantee the form matches what was used in clinical trials. Key ones: KSM-66 or Sensoril (ashwagandha), Creapure (creatine — German pharmaceutical grade), CarnoSyn (beta-alanine), Cognizin (citrulline choline), SR CarnoSyn (sustained release beta-alanine). Generic versions may be identical or inferior — third-party testing clarifies.
⚠ Label Red Flags
Avoid: proprietary blends that don’t disclose individual ingredient doses (hiding underdosing behind trade names); fillers and unnecessary additives; claims of “patent pending” for non-patentable natural compounds; exaggerated claims (“5× more effective”); products with more than 10–12 ingredients in a single formula (rarely effective for all). More ingredients in a pre-workout does not mean more effectiveness.
⚠ Effective Dose Verification
Always cross-check the dose on the label against published research. Common underdosing: citrulline (needs 6–8g; most products contain 2–3g); beta-alanine (needs 3.2g; many products contain 1–1.5g); ashwagandha (KSM-66 RCTs use 300–600mg; some products contain 50–100mg). A product that contains the right ingredient at the wrong dose is effectively a placebo.
Common Supplement Myths — Evidence vs Marketing
The supplement industry relies heavily on misrepresented research, cherry-picked studies, and marketing claims that exceed the evidence. These are the most pervasive myths and what the research actually shows.
| Myth | Common Claim | Reality |
|---|---|---|
| “BCAA are essential post-workout” | BCAAs are needed to prevent muscle breakdown and trigger MPS after training | If your daily protein intake is adequate (1.6g/kg+), BCAAs provide no additional MPS benefit. EAA are superior to BCAA when protein intake is borderline. BCAAs become relevant only in fasted training contexts. |
| “You must take protein within 30 minutes” | The anabolic window closes 30 minutes post-workout | The post-exercise MPS elevation persists for 4–6 hours. Consuming protein within 2 hours post-workout is sufficient. Total daily protein matters far more than exact timing. Multiple meta-analyses have shown the “window” effect is small compared to total protein. |
| “Pre-workout supps replace sleep” | Take pre-workout to train even when sleep-deprived | Caffeine masks fatigue without addressing underlying sleep debt. Sleep deprivation reduces muscle protein synthesis, increases cortisol, reduces testosterone, and impairs recovery — none of which stimulants address. Sleep is the most effective performance supplement available. |
| “Creatine causes kidney damage” | Creatine increases creatinine and strains the kidneys | Creatine supplementation raises serum creatinine (a byproduct of creatine metabolism) — but this is a normal biochemical consequence, not kidney damage. Multiple long-term safety studies (up to 5 years) show no kidney function impairment in healthy individuals. The concern applies only to pre-existing kidney disease. |
| “More supplements = better results” | Stacking 15+ supplements maximises outcomes | Interactions multiply with stack size; absorption competition occurs with some co-administered supplements; cost-effectiveness decreases dramatically. Research shows 4–6 well-selected supplements with clear evidence outperform larger stacks with redundant or poorly evidenced additions. |
Food First — When Supplements Are and Aren’t Warranted
Supplements are designed to supplement a complete diet — not replace it. Understanding when supplements provide meaningful benefit versus when whole food addresses the same need prevents unnecessary spending and prioritises the interventions with the highest actual return.
🥩 When Whole Food Is Superior
Protein needs are almost always best met from whole food first — which provides protein alongside micronutrients, fibre, and satiety benefits no protein powder delivers. Creatine exists in meat (approximately 2g per 500g of beef) — but at doses far below what supplementation achieves. For most vitamins and minerals, whole food provides a superior absorption matrix than isolated supplements.
💊 When Supplements Are Warranted
Vitamin D3: almost impossible to achieve optimal status from food alone (especially at higher latitudes October–April). Omega-3 at clinical doses (2–4g EPA+DHA): difficult without daily oily fish. Creatine at 5g/day: requires 1–2 kg of raw beef daily from food — supplementation is the only practical route. Performance-specific compounds like citrulline and beta-alanine have no meaningful food source.
📊 Priority Order for Investment
1. Optimise food quality and protein intake first. 2. Test and correct Vitamin D and Omega-3 (most widespread deficiencies). 3. Add Creatine (strongest evidence-to-cost ratio in supplements). 4. Add Magnesium if sleep or recovery is poor. 5. Add performance-specific compounds (caffeine, beta-alanine, citrulline) based on training goals. 6. Add advanced compounds (adaptogens, nootropics) once foundations are solid.
🧪 Testing Before Supplementing
For Vitamin D, Omega-3 Index, Magnesium, Zinc, and Ferritin — blood testing before supplementing removes the guesswork and prevents under- or over-supplementing. A Vitamin D blood test costs £20–40 and tells you precisely what dose you need. Supplementing without testing often results in taking inadequate doses for years (most people need 3,000–5,000 IU, not the 400 IU in most multivitamins).
Beginner vs Advanced Supplementation Strategies
The optimal supplement stack changes significantly with training experience — because physiological responses to training and to specific supplements shift with adaptation level. Beginners and advanced athletes have fundamentally different supplementation priorities.
| Category | Beginner (0–18 months training) | Intermediate (18m–4 years) | Advanced (4+ years) |
|---|---|---|---|
| Primary Driver of Progress | Training consistency; calorie adequacy; sleep | Progressive overload; protein precision; recovery quality | Marginal gains; periodisation; advanced recovery |
| Highest ROI Supplements | Vitamin D3, Creatine, Protein powder (if diet insufficient) | Creatine, Protein, Omega-3, Caffeine | Full evidence-based stack with goal-specific periodisation |
| HMB Value | High — greatest benefit for untrained individuals | Low — rapidly attenuates with training experience | Minimal except during prolonged cuts or detraining |
| Caffeine Response | High acute response; tolerance builds rapidly — use sparingly | Moderate with managed cycling | Managed cycling essential; periodise with competition schedule |
| Advanced Compounds | Not warranted — margin is too small relative to training gain | Adaptogens, nootropics add modest benefit | Full stack appropriate; stacking intelligence highest priority |
| Approximate Monthly Budget | £30–50 (D3, creatine, protein if needed) | £60–100 (core stack) | £100–180 (full evidence-based stack) |
Responsible Supplement Use & Medical Considerations
This tool is designed to help you build an evidence-based supplement stack — but responsible use requires understanding the limitations of this guidance and when to seek professional input.
⚕️ When to See a Doctor First
Always consult a GP or sports medicine physician before starting any supplement protocol if you: have a diagnosed medical condition (cardiovascular disease, kidney disease, diabetes, thyroid conditions); take prescription medication of any kind; are pregnant or breastfeeding; are under 18 years old; have experienced adverse reactions to supplements previously. This tool does not constitute medical advice.
📋 Tracking and Monitoring
Start new supplements one at a time — not your entire stack simultaneously. This allows you to identify any adverse reactions before they compound. Give each new supplement 4–6 weeks before evaluating effectiveness. Keep a simple training log noting energy, recovery, and performance metrics. Re-evaluate your stack every 3–4 months against your current goals — as goals shift, the optimal stack should shift too.
🧪 Blood Testing Baseline
Before starting a supplement protocol, consider a basic blood panel including Vitamin D (25-OH), Omega-3 Index, Ferritin, Magnesium (red blood cell — not serum), Zinc, and Complete Blood Count. This identifies true deficiencies versus adequate status and prevents supplementing what you don’t need while missing what you do. Many GP practices offer these tests; private testing is increasingly accessible.
🎯 The Non-Negotiable Foundation
No supplement stack compensates for: chronic sleep deprivation (below 7 hours consistently), inadequate protein intake (below 1.6g/kg), significant caloric deficit or surplus misaligned with goals, insufficient training volume and progressive overload, or high chronic stress. Supplements improve a good foundation — they cannot build one.
Dosages and timing are based on published research and are generalisations — individual needs vary.