Protein recovery supplement UK: what actually works

The UK supplement market is loud and mostly underdosed. What the evidence actually supports for post-exercise recovery is a short list: adequate protein, creatine monohydrate, and a few co-factors that help the machinery around them function. A 2025 narrative review by Naderi et al. (2025) found that protein timing and creatine co-supplementation consistently outperformed most other recovery strategies in the published literature. That's where I'd start.

Recovery is not one molecule. It is a sequence of biological events, and the supplements that work are the ones that match that sequence with real doses and real evidence.

From this read

What the evidence actually shows

I want to be direct about something before going further. The phrase "protein recovery supplement" gets applied to a very wide range of products in the UK: whey shakes, amino acid capsules, collagen drinks, and multi-ingredient powders with fifteen ingredients at doses too low to do anything. The evidence does not support most of them as recovery tools in their own right. What it does support is specific.

Naderi et al. (2025), a narrative review covering post-exercise nutritional strategies, identifies protein quantity and timing, creatine, and carbohydrate replenishment as the interventions with the strongest and most consistent evidence base. The review notes that co-supplementation of creatine with protein may produce additive effects on lean mass and recovery markers, though the authors are careful to note that most studies are in trained populations and effect sizes vary.

Collins et al. (2021), writing in the UEFA expert nutrition statement, make a similar point: recovery nutrition in elite sport centres on protein (1.6-2.2 g/kg/day across the day), carbohydrate timing, and sleep quality. Supplements are adjuncts to that foundation, not replacements for it. The human data on many marketed "recovery" ingredients is thin, and I'd be overstating it to claim otherwise.

Kozjek et al. (2025) add a useful angle: immune function and recovery from injury are intertwined. Nutritional status, particularly protein adequacy and micronutrient sufficiency, directly affects how quickly the body resolves the inflammatory response to exercise. That framing matters when you're choosing a supplement stack.

The biology: what is actually happening after hard exercise

Exercise, particularly resistance or high-intensity work, creates mechanical damage to muscle fibres. Sarcomeric proteins are disrupted. Satellite cells are activated. An acute inflammatory cascade begins, involving interleukin-6, tumour necrosis factor-alpha, and other cytokines. This is not a malfunction. It is the signal that drives adaptation.

The problem is that this process takes resources. Amino acids are required for muscle protein synthesis. ATP is needed to power the cellular repair machinery. Reactive oxygen species generated during exercise can, if not adequately managed, prolong the inflammatory phase. The body's antioxidant systems, including glutathione and superoxide dismutase, require cofactors to function.

Protein provides the amino acid substrate. Leucine, specifically, acts as a signalling molecule at the mTORC1 pathway, which is the primary regulator of muscle protein synthesis. Without sufficient leucine, the anabolic signal is blunted regardless of total calorie intake. This is why protein quality matters as much as quantity: a food or supplement that delivers sufficient leucine per serving (typically 2-3 g) will activate mTORC1 more effectively than an equivalent mass of lower-quality protein.

Creatine phosphate, meanwhile, is the fastest substrate for ATP resynthesis. During high-intensity work, phosphocreatine stores are depleted within seconds. Supplementing creatine monohydrate raises the intramuscular pool, which means faster resynthesis between bouts and, over time, the ability to sustain higher training volumes. Creatine increases physical performance in successive bursts of short-term, high intensity exercise [GB-NHC]. That performance effect is also a recovery effect: more work done, recovered from, and repeated.

Vitamin C contributes to normal collagen formation for the normal function of skin [GB-NHC], which extends to connective tissue more broadly. Collagen is the dominant structural protein in tendons and ligaments. Vitamin C also contributes to the protection of cells from oxidative stress [GB-NHC], which is directly relevant to the post-exercise redox environment.

Dosing: what the clinical evidence actually supports

Protein first. The dose range most consistently associated with near-maximal muscle protein synthesis in adults is 20-40 g per meal, with the higher end being more relevant for older adults and those with higher lean mass. Across the day, 1.6-2.2 g per kg of bodyweight is the range cited by Collins et al. (2021) and broadly consistent with the broader sports nutrition literature. For a 75 kg adult, that is 120-165 g of protein daily from food and supplement sources combined.

Timing matters less than total intake, but the post-exercise window (within two hours) is worth targeting if you are training in a fasted or semi-fasted state. The anabolic sensitivity of muscle is elevated in this window, though the effect is smaller than was once believed.

Creatine monohydrate at 5 g daily is the standard maintenance dose. A loading phase of 20 g/day (split into four doses) for five to seven days will saturate stores faster, but you arrive at the same endpoint after three to four weeks of 5 g/day. If you want to read more on this, I've written a detailed breakdown at how much creatine per day what the evidence shows. The KōJō Daily Formula delivers the full 5, 000 mg of micronised creatine monohydrate per serving, which is the dose used in the majority of RCTs showing recovery and performance effects.

Vitamin C at 500 mg is well above the threshold for its authorised GB-NHC claims and consistent with the doses used in exercise-related research. Vitamin C contributes to the reduction of tiredness and fatigue [GB-NHC] and contributes to normal energy-yielding metabolism [GB-NHC].

Collagen peptides are worth a brief mention here. Khatri et al. (2022) reviewed the effects of collagen peptide supplementation on body composition, collagen synthesis, and recovery from joint injury. The evidence for joint-related outcomes is more promising than for muscle hypertrophy, with doses of 10-15 g/day appearing in the stronger trials. Collagen is not a complete protein and should not replace high-quality protein sources, but as an adjunct for connective tissue support the data is worth taking seriously. The human data is still developing and large-scale RCTs are limited.

BCAAs: useful or redundant if you're eating enough protein?

Branched-chain amino acids (leucine, isoleucine, valine) are probably the most marketed recovery ingredient in the UK supplement space. The honest answer is: they may help, but the effect is largely redundant if your total protein intake is adequate.

Martinho et al. (2022), in a systematic review of BCAA supplementation in athletes, found that BCAAs may reduce markers of exercise-induced muscle damage and perceived soreness, but the effect sizes were modest and the studies heterogeneous. The review notes that most positive findings come from studies where dietary protein intake was not controlled, meaning the BCAAs may simply have been filling a gap.

If you are eating 1.6-2.2 g/kg/day of high-quality protein, additional BCAA supplementation is unlikely to add meaningful benefit. If you are training in a fasted state or eating a lower-protein diet, they may offer something. But a whey or plant-based protein source that delivers adequate leucine will do the same job at lower cost.

For plant-based athletes, the picture is slightly more complex. West et al. (2023) note that vegan athletes may need to pay closer attention to leucine content per serving and total protein distribution across the day, since many plant proteins have lower leucine density per gram. Combining sources (e.g. rice and pea) addresses this in practice.

The supporting cast: glycine, taurine, and the polyphenol stack

Beyond protein and creatine, a number of ingredients appear in recovery-focused formulas with varying degrees of evidence behind them. I'll be specific about what I think the data actually supports.

Glycine

Glycine is the most abundant amino acid in collagen and plays a role in creatine biosynthesis (creatine is synthesised from glycine, arginine, and methionine). It is also a precursor to glutathione, the body's primary intracellular antioxidant. Research into glycine's specific recovery effects in humans is ongoing, and large-scale RCTs in athletic populations are limited. The dose in the KōJō formula is 2, 000 mg, which is within the range used in existing research.

Taurine

Taurine is conditionally essential, meaning the body synthesises it but may not produce enough under high physiological demand. It is concentrated in skeletal muscle and cardiac tissue. Some research suggests it may reduce oxidative stress markers after exercise, though the human data on this is thin and I'd be overstating it to claim a definitive recovery benefit. Research is ongoing and large-scale trials are limited.

Polyphenols: aged garlic, olive leaf, grape seed, pine bark

These four ingredients share a common thread: they are sources of polyphenolic compounds with antioxidant activity in vitro and, to varying degrees, in human studies. The challenge is that "antioxidant activity" in a test tube does not straightforwardly translate to blunted exercise-induced oxidative stress in vivo. The body is not a test tube. Kozjek et al. (2025) note that excessive antioxidant supplementation may actually blunt some adaptive signalling, which is a real consideration. For each of these ingredients, research is ongoing and large-scale human trials in exercise populations are limited. I include them at the doses in the formula because the safety profile is good and the mechanistic rationale is plausible, not because I can point to a definitive RCT proving a recovery effect.

I should also flag something I find genuinely interesting, though tangentially related: the broader conversation about environmental factors affecting what goes into supplements. If you want context on why ingredient sourcing matters, the piece on 'It's like having an amusement park and not opening it' - algae closures take toll is worth reading.

Protein recovery and injury: a slightly different question

Tipton (2016) makes a distinction I think is worth holding onto: recovery from training and recovery from injury are related but not identical processes. The nutritional priorities shift when you are dealing with an actual injury rather than normal post-exercise adaptation.

In injury recovery, protein intake remains critical, but energy intake also needs attention. Immobilisation increases muscle protein breakdown and reduces anabolic sensitivity. The temptation to reduce calories during injury is understandable but counterproductive. Tipton (2016) recommends maintaining protein at the upper end of the normal range (2.0-2.5 g/kg/day) during periods of forced inactivity to minimise lean mass losses.

Sowerbutts et al. (2024), writing on preoperative nutrition in surgical patients, reinforce this point from a clinical angle: nutritional status before a physiologically stressful event (surgery, or by extension, a heavy training block) significantly affects outcomes. Getting protein intake right before a hard period matters as much as what you do after it.

The question of timing also shifts with injury. If you are training one limb while the other is immobilised, protein timing around the training session remains relevant. If you are fully resting, distribution across the day (every three to four hours) is more important than any specific post-exercise window.

Creatine timing and recovery: a practical note

I've written in more detail elsewhere, but the short version: creatine timing matters less than consistent daily dosing. The question of whether to take it pre- or post-exercise is genuinely unresolved in the literature. I'd suggest reading best time to take creatine what the evidence shows if you want the full breakdown. The practical answer is: take it at whatever time you will take it consistently. Saturation of intramuscular stores is a cumulative effect, not an acute one.

What I will say is that pairing creatine with a protein-containing meal may slightly improve uptake due to the insulin response from carbohydrates and protein. This is a modest effect, not a requirement. The primary driver of intramuscular creatine content is total daily dose over time.

What UK buyers should actually look for on a label

The UK supplement market is not well-regulated at the ingredient-dose level. A product can legally list an ingredient on the label at a dose so low it has no physiological relevance. This is common. Here is what I'd actually look for:

• Creatine monohydrate at 3-5 g per serving. Not creatine HCl, not creatine ethyl ester. Monohydrate has the evidence base. Anything under 3 g is likely underdosed for performance or recovery effects.
• Protein source and leucine content. Whey concentrate and isolate are reliable. Plant blends (rice plus pea) can be adequate if leucine content is declared. Aim for at least 2 g of leucine per serving.
• Vitamin C at a meaningful dose. The GB-NHC threshold for immune function is 15 mg/day. That is a floor, not a target. Doses of 200-500 mg are more consistent with exercise-related research.
• Full ingredient disclosure. No proprietary blends where individual doses are hidden. If a brand will not tell you how much of each ingredient is in the product, that tells you something.
• Third-party testing. Informed Sport or NSF certification is the relevant standard in the UK for athletes subject to anti-doping rules.

Collins et al. (2021) make the point explicitly: supplement quality control is a genuine concern, and athletes should prioritise products with batch-testing certification. This applies to recreational exercisers too, not just professionals.

Frequently asked questions

My honest take

I built KōJō partly out of frustration with this category. The UK recovery supplement market is full of products that list fifteen ingredients, dose most of them at a fraction of what the evidence uses, and charge a premium for the label design. I've bought plenty of them myself over the years.

What I've come to believe, after reading a lot of primary literature and talking to people who actually study this, is that the effective stack is genuinely short. Protein, creatine, Vitamin C, and sleep. That's most of it. The polyphenols and amino acid co-factors I include in the KōJō formula are there because the mechanistic rationale is sound and the safety profile is good, but I won't pretend the human RCT evidence for each of them is as strong as it is for creatine or protein. It isn't. Research is ongoing.

What I'm more confident about is the principle: if a supplement doesn't tell you the dose of every ingredient, and if the dose of the ingredients it does declare doesn't match what the clinical trials used, it probably won't do what the label implies. That's not cynicism. It's just reading the label carefully.

If you are training consistently and eating enough protein, the marginal benefit of any single supplement is modest. The compounding effect of doing the basics well, every day, over months, is where the real adaptation happens. Supplements are tools to fill specific gaps, not substitutes for the fundamentals.

I'm still learning here too. The literature on polyphenols and exercise recovery is genuinely evolving, and I'd expect some of what I've written above to need updating in two or three years as better RCTs emerge. That's how it should work.

This article is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement regimen.