Do you need protein on rest days?
Yes. Muscle protein synthesis stays raised for about a day after hard training. What the research shows and how much protein to eat on days off.
By RecovPublished · Last updated · 3 min read
Yes. Research from McMaster University showed muscle protein synthesis roughly doubles 24 hours after heavy training and is near baseline by about 36 hours. Keep your protein at the same daily level on rest days as on training days, spread across three to five meals.
What happens to your muscles on a rest day?
Training is the signal. The rebuilding happens afterwards, and much of it happens on the days you don't train.
In a 1995 study at McMaster University, MacDougall and colleagues looked at how long muscle protein synthesis stays raised after heavy resistance training. Building on earlier measurements of about 50% above normal at four hours and 109% at 24 hours, they found it was back to within 14% of normal at around 36 hours. Their conclusion: after heavy resistance training, synthesis "is more than double at 24 hrs" and then falls quickly. The study was small (six young men, arm exercise only), but the message is clear: the day after training is still a building day.
Do you need less protein when you don't train?
Probably not, and possibly more. A 2024 study by Moore and colleagues in endurance-trained men used the indicator amino acid oxidation method to compare a rest day with the day of a 10 or 20 km run. It suggested protein requirements "may be greatest on recovery days". One of the authors works for Ajinomoto, an amino acid manufacturer, and the study was small, but it points the same way as the muscle research: rest days aren't low-protein days.
The sports nutrition guidelines are daily targets for that reason. The International Society of Sports Nutrition gives 1.4–2.0 g per kilogram of body weight a day for most exercising people, not per training day. Work out your own number in how much protein do I need a day.
How should you spread protein on a rest day?
The ISSN recommends spreading protein evenly, every three to four hours, at about 20–40 g per serve. Without a session to plan around, a rest day is the easiest day to get this right:
| Time | Rest-day protein |
|---|---|
| Breakfast | Eggs, Greek yoghurt or smoked salmon |
| Lunch | Chicken, tuna, lentils or leftovers |
| Afternoon | Milk, cheese, or protein tablets |
| Dinner | Meat, fish or tofu with vegetables |
| Before bed | A final serve |
That last serve is covered in detail in protein before bed. For why splitting protein beats one huge meal, see how much protein can you absorb at once.
Pre-digested plasma peptides. All 20 amino acids, absorbed in 15–25 min.
Recov Protein Concentrate
Shop Recov →From $2.67/day · free shipping over $99 · pause or cancel anytimeShould you take a protein supplement on rest days?
If food gets you to your number, you don't need one. If your rest days are also your busy days, with work, errands and family, a supplement keeps the gaps from turning into a low day.
How should you take Recov on rest days?
Stay on the level that matches your training week, and spread the tablets across the day rather than around a session. Recov is a complete protein with all 20 amino acids, from porcine plasma protein pre-digested into di- and tri-peptides, and it contains no caffeine or stimulants. Your whole bloodstream carries only 2–3g of amino acids at any moment. Six tablets of Recov deliver roughly that entire amount, already broken down into small peptides your body absorbs directly.
Six tablets a day is the everyday standard, 8–12 suits training three to five times a week, and 12–18 suits training most days or competing. On rest days, take your tablets any time of day with water; see the chart for your level.
You can see Recov and the full dosing chart here.
Frequently asked questions
Should I take protein on rest days?
Yes. Muscle protein synthesis stays raised for about a day after hard training, and the guidelines are daily targets, so your protein target applies every day.
Do I need less protein on rest days?
Not according to the guidelines, which are daily targets. A 2024 study in endurance-trained men suggested needs may even be highest on recovery days.
When should I have protein on a rest day?
Spread it across the day, every three to four hours, at about 20–40 g per serve, with a final serve before bed.
Can I take Recov on days I don't train?
Yes. Recov is a daily protein. On rest days, take your tablets any time of day with water; see the chart for your level.
Does a rest day mean no protein shake?
It's your call. What matters is your total for the day. Tablets are an option if you don't want a shake on a day off.
This article is general information, not medical advice. Recov isn't suitable for vegetarians, vegans or anyone who avoids porcine-derived ingredients. Questions: management@recovfaster.com.
Sources
- MacDougall JD et al., "The time course for elevated muscle protein synthesis following heavy resistance exercise", Canadian Journal of Applied Physiology, 1995 (cites earlier +50% at 4 h / +109% at 24 h; measured ~36 h: within 14% of control)
- Moore DR et al., "Protein requirements may be lower on a training compared to rest day but are not influenced by moderate training volumes in endurance trained males", Applied Physiology, Nutrition, and Metabolism, 2024
- Jäger R et al., "International Society of Sports Nutrition Position Stand: protein and exercise", 2017 (1.4–2.0 g/kg/day; 20–40 g; every 3–4 hours)
- Recov product page (dose chart)
