Supplement Answers
100 plain-English, evidence-based answers to the questions lifters actually ask — how much to take, when to take it, what is safe, and what genuinely works. Every answer links through to the full ingredient guide or category breakdown behind it.
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How much protein you need, whey vs isolate vs casein, EAAs, bars and spotting a dodgy label.
Most whey concentrates deliver 20 to 25g of protein per scoop; isolates can reach 25 to 27g with fewer carbs and less fat.
More: Whey Protein →Concentrate is the best value for most people. Isolate is worth the extra cost mainly if you are lactose-sensitive or tightly managing calories.
More: Whey Protein →Adding cheap free-form aminos to inflate the label protein figure. It misleads buyers, so we score amino-spiked products zero on purity.
More: Whey Protein →Only if you are a drug-tested athlete. Certification screens for banned substances batch by batch; recreational lifters can prioritise value instead.
More: Whey Protein →Not for everyone. Isolate is leaner and lower in lactose, which helps if you are cutting or lactose-sensitive, but concentrate gives more protein per pound spent.
More: Whey Isolate →Nutritionally they are comparable. Clear whey is a lighter, juice-style drink; pick it for taste preference, not for any performance edge.
More: Whey Isolate →Typically 25 to 27g of protein with very low carbs and fat per serving.
More: Whey Isolate →A slow, steady amino acid release, which is why it is popular as a pre-bed shake or between long gaps in meals.
More: Casein Protein →Neither is better overall. Whey digests fast and suits around training; casein digests slowly and suits overnight or long fasts.
More: Casein Protein →Micellar casein is the higher-quality, slow-release form. Calcium caseinate is cheaper, more processed and digests faster.
More: Casein Protein →Yes. Muscle protein synthesis needs all nine essential amino acids, so a full EAA blend beats BCAAs, which only provide three.
More: EAAs and BCAAs →Not really. With adequate daily protein they are mainly a convenience for fasted or long training sessions and to encourage hydration.
More: EAAs and BCAAs →Around 2 to 3g of leucine per serving, since leucine is the main trigger for muscle protein synthesis.
More: EAAs and BCAAs →Around 15 to 20g of protein for roughly 200 calories is a strong protein-to-calorie ratio.
More: Protein Bars →In moderation they are fine and keep sugar low, but larger amounts of sugar alcohols like maltitol can cause digestive discomfort.
More: Protein Bars →They are best as a convenient snack to top up protein, not a regular meal replacement. Whole food is cheaper per gram of protein.
More: Protein Bars →Balanced protein, carbs and fat, a broad vitamin and mineral profile, some fibre, and enough calories (often 300 to 400 per serving) to actually replace a meal.
More: Meal Replacement Shakes →A well-formulated one can be a balanced, convenient meal stand-in. They are best used occasionally for convenience rather than as a permanent replacement for whole food.
More: Meal Replacement Shakes →Nutritionally they can be similar. Powders are usually cheaper per serving; ready-to-drink bottles cost more but win on convenience.
More: Meal Replacement Shakes →Typically 20 to 25g for concentrate and 25 to 27g for isolate, with isolate carrying fewer carbs and less fat.
More: Whey Protein →Concentrate is the best value for most people. Isolate is worth the premium mainly if you are lactose-sensitive or tightly managing calories.
More: Whey Protein →Adding cheap free-form aminos to inflate the label protein figure. It misleads buyers, so we score amino-spiked products zero on purity.
More: Whey Protein →Around 2 to 3g per serving maximises the muscle-building signal. You get that from roughly 20 to 25g of a quality protein like whey.
More: Leucine →Usually not. Leucine triggers muscle protein synthesis but needs the other essential amino acids as building blocks, so a complete protein or full EAA blend is better.
More: Leucine →No. BCAAs provide leucine but lack the other six essential amino acids needed to actually build muscle, so a full EAA blend or whole protein is superior.
More: Leucine →Dosing, loading, monohydrate vs the fancy forms, and whether Creapure is worth it.
3 to 5 grams of creatine monohydrate daily is the evidence-based maintenance dose. A loading phase is optional.
More: Creatine Monohydrate →No. Loading (around 20g a day for a week) saturates your muscles faster, but taking 3 to 5g daily reaches the same level within three to four weeks.
More: Creatine Monohydrate →Creapure is a high-purity certified monohydrate and a reliable quality marker, but standard micronised monohydrate from a reputable brand is also very effective and cheaper.
More: Creatine Monohydrate →Timing has little effect. Daily consistency matters far more than whether you take it before or after training.
More: Creatine Monohydrate →For most people, yes on value. Monohydrate has the deepest evidence base and is far cheaper; the fancier forms rarely justify their premium.
More: Creatine Monohydrate →Creapure is a high-purity certified monohydrate and a reliable quality marker, but standard micronised monohydrate from a reputable brand works just as well for less.
More: Creatine Monohydrate →Caffeine, pump and focus ingredients, the doses that actually work, and the tingles.
Around 3 to 6mg per kg of bodyweight. We penalise servings above 400mg, where downsides tend to outweigh benefits.
More: Pre-Workout Supplements →Caffeine for focus and effort, citrulline for blood flow and pump, and beta-alanine (3.2g/day) for higher-rep fatigue buffering.
More: Pre-Workout Supplements →They hide the individual ingredient doses behind one total, which usually masks under-dosing. We score blended products down heavily.
More: Pre-Workout Supplements →Yes if you train late or are caffeine-sensitive. You keep the pump and performance ingredients without the stimulant affecting sleep.
More: Pre-Workout Supplements →Not for a normal hour in the gym if you have eaten beforehand. They earn their place during long, hard or fasted sessions where mid-workout fuel helps.
More: Intra-Workout Supplements →Usually essential amino acids for muscle support, fast carbohydrate for energy, and electrolytes (mainly sodium) to replace sweat losses.
More: Intra-Workout Supplements →EAAs. Muscle protein synthesis needs all nine essential amino acids, so a full EAA blend beats a BCAA-only product for the same money.
More: Intra-Workout Supplements →Protein (around 20 to 40g of a fast source like whey) plus some carbohydrate to refuel. Creatine is a useful daily add-on. A normal meal soon after works just as well for most people.
More: Post-Workout Recovery Supplements →It is much wider than the old 30-minute claim. As long as you eat protein in the hours around training, exact timing has little effect on muscle growth.
More: Post-Workout Recovery Supplements →They help refill muscle glycogen after hard or long sessions, but if you eat enough carbohydrate across the day it is not essential to have them immediately post-workout.
More: Post-Workout Recovery Supplements →Around 3 to 6mg per kg of bodyweight, taken 30 to 60 minutes before training. We penalise pre-workouts that exceed 400mg per serving.
More: Caffeine →400mg is roughly the safe daily ceiling for most healthy adults from all sources, so a single serving at that level leaves no room for coffee or other sources. We mark products above it down.
More: Caffeine →Yes, quite quickly. Many lifters cycle off for a week or two periodically, or keep the dose modest, to keep it effective.
More: Caffeine →Around 6 to 8g of pure L-citrulline, or 9 to 12g of citrulline malate. Many products under-dose it well below this.
More: L-Citrulline →Both work. Citrulline malate is only part citrulline by weight, so you need a higher total to match the same pure L-citrulline dose.
More: L-Citrulline →It can, by raising nitric oxide and blood flow, but only at a proper dose. Under-dosed citrulline does little.
More: L-Citrulline →Around 3.2 to 6.4g per day, taken consistently for several weeks. The benefit comes from building up muscle carnosine over time, not from a single dose.
More: Beta-Alanine →The tingling (paraesthesia) is a harmless, temporary nerve sensation caused by the dose. Splitting it into smaller amounts through the day reduces it.
More: Beta-Alanine →No. It needs daily, consistent intake over weeks to raise muscle carnosine. A single serving on the day does little.
More: Beta-Alanine →It pairs with caffeine to give cleaner, calmer focus and reduce jitters and the post-stimulant crash.
More: L-Theanine →Roughly 1:1 to 2:1 theanine to caffeine, for example 100 to 200mg of each, is the commonly used range.
More: L-Theanine →No. It promotes calm, alert focus rather than sedation, which is why it works so well alongside a stimulant.
More: L-Theanine →Around 2.5g per day, taken consistently. Many pre-workouts under-dose it below this level.
More: Betaine Anhydrous →It offers a small but real boost to power output and training volume, likely via cellular hydration and supporting creatine synthesis.
More: Betaine Anhydrous →Yes. Betaine anhydrous and trimethylglycine (TMG) are the same compound.
More: Betaine Anhydrous →Around 1 to 2g, taken pre-workout or alongside training, is the typical effective range.
More: Taurine →It supports cellular hydration and antioxidant function, with modest evidence for endurance and for smoothing stimulant effects.
More: Taurine →Yes, it is very well tolerated, including at doses above the usual range. The taurine in supplements is synthetic.
More: Taurine →Commonly 500 to 2000mg, taken 30 to 60 minutes before a workout or demanding task.
More: L-Tyrosine →The evidence is strongest for maintaining focus under stress, fatigue or sleep deprivation, and weaker for boosting a well-rested mind in normal conditions.
More: L-Tyrosine →N-acetyl-L-tyrosine is more soluble but absorbed less efficiently gram-for-gram, so plain L-tyrosine is often the better-value choice.
More: L-Tyrosine →Why sodium is the ingredient that matters and when a hydration product is worth it.
Sodium is the priority, supported by potassium and magnesium. Effective products often provide 500 to 1000mg of sodium per serving.
More: Electrolytes and Hydration →Only for prolonged endurance exercise, where some carbohydrate aids fluid absorption and fuelling. For everyday use you can skip it.
More: Electrolytes and Hydration →They usually contain only token amounts of sodium and rely on flavour and sugar, so they hydrate far less effectively than higher-dosed powders.
More: Electrolytes and Hydration →Sodium. Effective hydration products often provide 500 to 1000mg of sodium per serving, with potassium and magnesium in supporting roles.
More: Electrolytes →They usually contain only token amounts of sodium and lean on flavour and sugar, so they replace far less of what you lose in sweat.
More: Electrolytes →No. Short, light sessions are fine on water. Electrolytes earn their place during long, hot or heavy-sweat training.
More: Electrolytes →Vitamin D, magnesium, zinc, multivitamins, ZMA and gut health, with sensible UK doses.
Vitamin D is the strongest case for most UK adults, especially in winter. Omega-3 and magnesium help if your diet is short on them. Beyond that, supplement to fix a known gap rather than by default.
More: Vitamins and Wellbeing Supplements →Yes. Fat-soluble vitamins like A and E, and minerals like iron, can be harmful in excess. With most nutrients, more than you need offers no extra benefit.
More: Vitamins and Wellbeing Supplements →For general nutrients like vitamin D it is reasonable to supplement sensibly without one. For persistent symptoms or things like iron, a blood test is the smarter route than guessing.
More: Vitamins and Wellbeing Supplements →They can be useful insurance against dietary gaps, but they are not a substitute for a varied diet. Targeted supplements for known gaps are often a better spend.
More: Multivitamins →Meaningful, well-absorbed doses of commonly-short nutrients like vitamin D, magnesium, zinc and B vitamins, in good forms, without megadoses of fat-soluble vitamins.
More: Multivitamins →Only if you specifically need it. Iron without a tested deficiency can build up and cause problems, so most general multis are better without it.
More: Multivitamins →At least 400iu daily to maintain levels, with many UK adults benefiting from 1000 to 4000iu, especially in winter. Staying at or below 4000iu keeps within the safe upper limit for unsupervised use.
More: Vitamin D →Yes. Vitamin D3 (cholecalciferol) raises and maintains blood levels more effectively than D2, so it is the preferred form.
More: Vitamin D →It is a sensible pairing, as K2 helps direct calcium into bone, but it is not essential. A well-dosed plain D3 is still very effective.
More: Vitamin D →Mainly only if you are deficient in zinc or magnesium. In people who already have enough, studies generally show no meaningful rise in testosterone.
More: ZMA →Many people find it does, largely thanks to magnesium. Taking it before bed in a well-absorbed form is the usual approach.
More: ZMA →Typically before bed, and away from calcium-rich foods or dairy, which can reduce absorption of the zinc and magnesium.
More: ZMA →Benefits are strain-specific, so it depends on the strain and the issue. Choose a product that names its strains and states the CFU count rather than a vague probiotic blend.
More: Gut and Digestion Supplements →Probiotics add bacteria, enzymes help break down foods you struggle with, and prebiotic fibre feeds your existing gut bacteria. Match the product to your actual problem.
More: Gut and Digestion Supplements →They are often oversold and under-dosed. Eating more whole plants and fibre usually does more for your gut than an expensive greens blend.
More: Gut and Digestion Supplements →Glycinate (bisglycinate) or citrate are well absorbed and gentle. Cheap magnesium oxide is poorly absorbed and more likely to upset the stomach.
More: Magnesium →Around 200 to 400mg of elemental magnesium per day from supplements is typical. Many people take it in the evening for its calming effect.
More: Magnesium →It can, particularly if you are short of it. Correcting a shortfall supports muscle relaxation and sleep quality; topping up when already adequate does little.
More: Magnesium →Around 10 to 25mg from supplements is sensible. Keep total long-term intake at or below roughly 40mg per day to avoid blocking copper.
More: Zinc →Mainly only if you are deficient. Correcting a zinc shortfall supports normal testosterone; topping up when already adequate does not raise it further.
More: Zinc →Yes. Sustained high doses interfere with copper absorption and can cause a copper deficiency, so stay within the upper limit.
More: Zinc →At least 400iu daily to maintain levels, with many adults benefiting from 1000 to 4000iu, especially in winter. Stay at or below 4000iu without medical supervision.
More: Vitamin D3 →It is a sensible pairing, as K2 helps direct calcium into bone, but it is not essential. A well-dosed plain D3 is still very effective.
More: Vitamin D3 →What test-support and cycle-support products can and cannot do, and when to see a clinician.
No over-the-counter product reliably raises testosterone in healthy men. The real benefit is correcting deficiencies in nutrients like zinc, magnesium and vitamin D that hormone production relies on.
More: Testosterone and Hormone Support Supplements →It is among the better-studied options, with evidence for lowering stress markers and modest effects on testosterone and recovery in some trials, though results vary.
More: Testosterone and Hormone Support Supplements →Yes. Suspected low testosterone should be assessed with a blood test by a qualified clinician, not self-treated with supplements.
More: Testosterone and Hormone Support Supplements →It aims to support the liver, heart and other organs during demanding regimes, typically using ingredients like milk thistle, NAC, omega-3 and CoQ10.
More: Cycle Support and Organ Health Supplements →No. No supplement offsets the underlying risk. Regular bloodwork and supervision from a qualified clinician are what protect your health, not a support product.
More: Cycle Support and Organ Health Supplements →Milk thistle and NAC have reasonable evidence for liver support, and omega-3 and CoQ10 for cardiovascular markers, but dosing and quality vary widely between products.
More: Cycle Support and Organ Health Supplements →Around 300 to 600mg per day of a standardised extract such as KSM-66. Standardisation matters more than the raw milligram figure.
More: Ashwagandha →The evidence is modest and mixed. Its strongest, best-supported effect is reducing stress and cortisol, with smaller possible effects on testosterone and recovery.
More: Ashwagandha →It is generally well tolerated short-term, but there are rare liver reports and medication interactions. Check with a clinician if you take medication or have a health condition.
More: Ashwagandha →Ready to pick a product?
These answers are educational and not medical advice. Doses reflect general evidence for healthy adults; if you take medication, have a health condition, or are pregnant, check with a qualified clinician before starting a supplement.
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