Ingredients hub
Ingredients, one at a time
Before a stack makes sense, each ingredient has to earn its place. These deep-dives cover forms and bioavailability, the doses used in human studies, interactions and contraindications, and who should skip the ingredient entirely — every figure checked against at least two primary sources. The pair checks answer the questions readers actually ask before mixing two bottles: can you take creatine and magnesium together? Ashwagandha and magnesium? Caffeine and L-theanine? The pair cluster below is where those live.
Sleep Stack
Magnesium glycinate, L-theanine and glycine — a melatonin-free evening stack with study doses and timing, in US and UK editions.
Glycine for Sleep: The 3-Gram Dose, Timing and Evidence
Glycine for sleep at the studied 3-gram dose: what the small trials found on sleep quality and next-day fatigue, how to take it, and the safety notes.
Sleep StackL-Theanine for Sleep and Focus: Dose and Honest Evidence
L-theanine from tea, without the hype: the 200 mg dose used in sleep and stress trials, how it pairs with caffeine, and who should avoid it.
Sleep StackMagnesium for Sleep: UK Doses, Claims and Honest Evidence
Magnesium for sleep in the UK: the 300 mg and 270 mg reference intakes, the 400 mg supplement guidance, EFSA wording, and what trials really show.
Sleep StackMagnesium Glycinate vs Oxide: Absorption, Dose and Cost
Magnesium glycinate vs oxide compared on absorption, elemental content, gut tolerance and cost per absorbed milligram, so you stop paying for chalk.
Sleep StackMagnesium Glycinate for Sleep: Dose, Timing and Evidence
Magnesium glycinate in full: how the chelated form absorbs, the 200-250 mg evening dose used in trials, interactions, and who should not take it.
Over-40 Stacks
Muscle, joints, heart and hormones after 40 and 50: creatine, protein, vitamin D, CoQ10, collagen and tongkat ali — each judged on its own evidence.
Collagen for joints: doses, forms and what trials found
Collagen for joints is not cartilage in a tub. This guide covers peptide and UC-II doses, trial results for pain and function, vitamin C and honest limits.
Over-40 StacksCoq10 explained: doses, statins, safety and who needs it
Coq10 is sold for energy and statin muscle aches, but evidence is narrower. This guide covers forms, 100-200 mg doses, warfarin cautions and honest limits.
Over-40 StacksCreatine after 40: how to keep muscle, strength and power
Creatine after 40 is not about bulking. This guide covers the 3-5 g dose, muscle and strength evidence in older lifters, kidney safety and who should skip it.
Over-40 StacksProtein for older men: how much you need after fifty now
Protein for older men is about hitting a daily total, not a magic powder. This guide covers 1.0-1.2 g/kg targets, meal doses, leucine and kidney safety.
Over-40 StacksTongkat ali after 40: what trials show and what they don't
Tongkat ali is marketed hard to men over 40. This guide covers what small trials actually found, standardised doses, liver and hormone cautions and limits.
Creatine Stacks & Pairs
The most-studied supplement in sports science: what to stack with it, the forms and loading questions, gummies, and the women-specific answers.
Creatine Monohydrate vs HCl: Solubility Is Not Superiority
Creatine monohydrate vs HCl compared on solubility, dose, research depth and cost. Why the cheaper, studied form still wins for almost everyone.
Creatine Stacks & PairsCreatine Gummies: Do They Really Deliver a Full Dose?
Creatine gummies look easy, but dose math, sugar, and stability problems mean many servings fall short. Here is how to check a label before you buy.
Creatine Stacks & PairsThe Creatine Loading Phase: Faster, Not Better Long-Term
The creatine loading phase saturates muscle in a week versus a month on 3-5 g a day. Compare both routes, side effects, and who should skip loading.
Creatine Stacks & PairsCreatine Monohydrate: Dose, Safety and What It Does
Creatine monohydrate explained plainly: how it supports high-intensity training, the 3-5 g dose, safety data, and who should check with a doctor first.
Creatine Stacks & PairsDoes Creatine Cause Bloating? Water, Gut and Fixes
Does creatine cause bloating? Most water goes inside muscle, not under skin. Learn why gut upset happens and the simple fixes that usually settle it.
Creatine Stacks & PairsDoes Creatine Cause Hair Loss? The DHT Study, Checked
Does creatine cause hair loss? One small 2009 DHT study started the claim and it was never replicated. A 2025 trial that measured hair found no effect.
Creatine Stacks & PairsWhen to Take Creatine: Before, After, or Any Time?
When to take creatine matters far less than taking it daily. See what timing studies actually found, and how to pick a time you will not forget.
Beginner Stack
Start here. The minimal stack that covers the basics, how to read a label without being fooled, and the mistakes that waste beginners’ money.
Creatine for Beginners: Dose, Timing, Honest Answers
Creatine for beginners, without the myths: 3–5 g of monohydrate a day, no loading, any time of day. What it does, what it does not, and who should skip it.
Beginner StackHow to Read a Supplement Label Without Being Fooled
Learning how to read a supplement label takes ten minutes and saves real money: serving sizes, % Daily Value, proprietary blends, and seals that matter.
Beginner StackWhey Protein Basics: Forms, Timing, and When It Helps
Whey protein is a convenient food, not a magic powder. Learn the forms (concentrate, isolate, hydrolysate), how much protein matters, and when a shake helps.
Endurance & Runners
Sodium, sweat and strategy for runners — US and UK guides, long-run fuelling, homemade mixes, and honest rules for when you need electrolytes at all.
Electrolytes for Long Runs: Marathon Fuel and Fluids
Electrolytes for long runs are a system, not a tablet: sodium before, during, and after, carbohydrate by the hour, and a fluid plan from your sweat rate.
Endurance & RunnersHomemade Electrolyte Drink: Ratios That Actually Work
A homemade electrolyte drink that matches sports-medicine ratios: per litre, ¼ tsp salt for training, and the WHO sugar-salt formula when rehydrating.
Endurance & RunnersSodium for Runners: How Much You Lose, How to Replace
Sodium for runners is simple maths once you measure: sweat rate times sweat sodium concentration. Worked examples, the weigh-in method, real targets.
Endurance & RunnersSugar-Free Electrolytes: When They Help, When Not To
Sugar-free electrolytes deliver real sodium, but sugar is no villain: on long runs it aids absorption and is your fuel. The honest trade-offs, inside.
Endurance & RunnersWhen Do You Need Electrolytes? The Honest Time Rules
When do you need electrolytes, and when is water enough? Duration, heat, and sweat rate decide — here are the thresholds sports medicine actually supports.
Vitamin D3 + K2
D3 with K2 done properly: doses, blood levels, timing with food, the warfarin cautions, and the stricter UK claims rules.
Vitamin D Dosage Explained: RDAs, Testing and Safe Limits
Vitamin D dosage without guesswork: the 600-800 IU RDA, the 4,000 IU upper limit, when testing changes the dose, and who needs medical supervision.
Vitamin D3 + K2Vitamin D Blood Levels: How to Read Your 25(OH)D Result
Vitamin D blood levels decoded: NIH and Endocrine Society ranges for 25(OH)D side by side, what ng/mL and nmol/L mean, and when to retest guide.
Vitamin D3 + K2Vitamin K2 MK-7 Explained: Forms, Doses and Warfarin Risks
Vitamin K2 MK-7 vs MK-4: half-life, typical 90-200 microgram doses, food sources, and why warfarin users must not start it without medical advice.
Vitamin D3 + K2When to Take Vitamin D: Timing, Food and Fat for Best Use
When to take vitamin D for best absorption: with your largest fatty meal, morning vs evening evidence, and the consistency rule that matters most.
Pre-Workout
Build your own pre-workout from citrulline, beta-alanine and caffeine + L-theanine at doses that match the studies — or go stim-free for evening training.
Beta-Alanine Tingles Explained: Why It Happens, Is It Safe?
Beta-alanine tingles are paresthesia, not damage. Why it happens, how long it lasts, how split doses and food reduce it, and when to get checked.
Pre-WorkoutBeta-Alanine for Hard Training: Dose, Timing and Evidence
Beta-alanine raises muscle carnosine to buffer hard efforts. The 3.2-6.4 gram studied range, split dosing, tingles, and who should skip it today.
Pre-WorkoutCaffeine Dosage for Training: How Much Helps or Hurts?
Caffeine dosage by body weight: 3-6 mg per kg explained, tolerance and sleep costs stated plainly, and how to find your lowest effective dose.
Pre-WorkoutL-Citrulline for Pump and Performance: Doses and Timing
L-citrulline vs citrulline malate: the real doses behind the label maths, timing 30-60 minutes before training, and who should avoid it safely.
Pair Checks
Can you take X with Y? Pair-by-pair checks of the combinations people actually mix — creatine with magnesium, caffeine with theanine, ashwagandha with magnesium, and more.
Ashwagandha and magnesium together: what to watch for
A common stress and sleep pair with no direct interaction study. What ashwagandha and magnesium each do, the thyroid and sedative cautions, and safer timing.
Pair ChecksCaffeine and l-theanine: the ratio, dose, and timing guide
Caffeine plus l-theanine is the calm-focus pair with real trial data. The studied ratios and doses, when to take them, and who should keep caffeine low.
Pair ChecksCan you take creatine and magnesium together safely?
Yes, for most healthy adults — no known direct interaction. Here is how to dose creatine and magnesium, when to separate them, and who should check first.
Pair ChecksCitrulline and beta alanine together: doses and timing
One works acutely on blood flow, the other builds up over weeks. Citrulline and beta alanine doses, timing, tingles, and who should skip this pre-workout pair.
Pair ChecksCreatine and coffee: does caffeine cancel creatine out?
The claim that caffeine cancels creatine came from two small loading studies. What the full review of ten studies found, and how to take both sensibly.
Pair ChecksCreatine and electrolytes: do you need both when you train?
Creatine works on muscle stores, electrolytes on fluid and sweat losses. When you need both, when water is enough, and how to dose each without overlap.
Pair ChecksCreatine and whey protein together: timing, dose, and use
Creatine and whey do different jobs and mix fine in one shake. Timing, doses, total daily protein, and the cases where whey adds nothing extra, explained.
Pair ChecksMagnesium and theanine for sleep: doses, timing, evidence
Magnesium and theanine are the gentle core of most sleep stacks. Doses, timing before bed, what the evidence can and cannot claim, and who should skip it.
Focus Stack
Lion’s mane, alpha-GPC and bacopa for work and study: calm focus without jitters, and honest readings of small human trials.
Alpha-GPC: Doses, Timing, and What It Can Actually Do
Alpha-GPC supplies choline for acetylcholine. Learn the studied doses for focus and exercise, the timing that matters, and the safety questions.
Focus StackBacopa for Memory: Why This Herb Takes Weeks to Work
Bacopa may help support memory recall, but only after 8 to 12 weeks of daily use. Doses, bacosides, side effects, and who should not take it.
Focus StackLion's Mane: What the Small Human Trials Really Show
Lion's mane is popular for focus, but human trials are small and mixed. Here is what the studies used, what they found, and who should avoid it.
Core Components
Ashwagandha and omega-3 in depth — doses, side effects, EPA/DHA targets — and where each one belongs inside a stack instead of on its own.
Ashwagandha Dosage: How Much KSM-66 or Sensoril to Take
Ashwagandha dosage depends on the extract. KSM-66 and Sensoril use different doses for a reason — studied ranges, timing, and safety limits here.
Core ComponentsAshwagandha for Sleep: Can a Stress Herb Help You Rest?
Ashwagandha for sleep works through stress, not sedation. The trials used 600 mg for 8 weeks or more — here is what that means for your nights.
Core ComponentsAshwagandha Side Effects: What Is Common and What Is Rare
Ashwagandha side effects are usually mild gut upset and drowsiness, but rare liver injury has been reported. What to watch for and when to stop.
Core ComponentsAshwagandha: Benefits, Limits, and Who Should Skip It
Ashwagandha may help support stress resilience and sleep, but it affects thyroid and interacts with sedatives. Doses, limits, and safety first.
Core ComponentsEPA and DHA Dosage: How Much Do You Actually Need?
EPA and DHA dosage has no single RDA. General guidance sits near 250 to 500 mg a day, with higher doses only under medical care. Full breakdown.
Core ComponentsFish Oil vs Algae Oil: Which Omega-3 Source Fits You?
Fish oil vs algae oil comes down to EPA and DHA dose, diet, and values — not absorption. Both raise levels well. Compare forms, costs, and risks.
Core ComponentsOmega-3: What EPA, DHA, and ALA Actually Do for You
Omega-3 covers ALA, EPA, and DHA, and they are not interchangeable. Food first, supplement doses, safety limits, and who should check first.