Short answer: the best post workout supplement for most athletes is a high quality protein, from food or a protein powder, plus carbohydrate when your next session is only hours away. The International Society of Sports Nutrition (ISSN) says protein after training strongly stimulates muscle protein synthesis, but hitting your daily protein total matters more than the exact minute you drink a shake [1][2]. If you are drug tested, keep it simple: a single ingredient product certified by a banned substance testing program carries less risk than a multi ingredient "post workout" formula [4][5].
Post workout supplements at a glance
| Question | Answer |
|---|---|
| What has the best evidence after training? | Protein. It supports muscle repair and adaptation to training [1][3][4] |
| Do I need carbohydrate too? | Yes, if you train or compete again within about 4 hours, or after long endurance work [1][2] |
| Is there a 30 minute "anabolic window"? | Not a strict one. The muscle building effect of exercise lasts at least 24 hours, though it fades with time [2] |
| Should I take creatine after a workout? | Creatine works by building up stores in your muscle over days of use, so it is not a recovery shake in the usual sense [6] |
| Are BCAAs or glutamine worth it? | The evidence is weak. Whole protein already contains the BCAAs [3] |
| What is the risk for tested athletes? | Products with extra ingredients and bodybuilding claims carry more contamination risk [3][4] |
What should you take after a workout?
Start with what the workout asked of you. Three things cover almost every situation.
- Protein. Protein gives your muscles the building blocks to repair and adapt. The ISSN describes post exercise protein, from immediately to 2 hours after, as stimulating "robust increases" in muscle protein synthesis [1]. For healthy exercising adults, its general recommendation is 20 to 40 grams of high quality protein per serving [2]. Your sports dietitian can tell you what fits you.
- Carbohydrate. Carbohydrate refills the glycogen (stored fuel) your muscles used. It matters most when recovery time is short. The ISSN's rapid refuelling advice applies when you have less than 4 hours before the next session [1].
- Fluid and electrolytes. A sweaty session leaves a fluid and sodium deficit. The IOC lists electrolyte products for "rapid postexercise rehydration following moderate to large fluid and sodium deficits" [4]. Our electrolytes guide covers the NCAA side.
Food does all three. A meal with milk, yogurt, eggs, meat, fish or beans plus rice, bread or fruit covers protein and carbohydrate. A supplement is a convenience, not a requirement. The ISSN calls protein supplements "a practical way" to get enough protein, especially for athletes who train a lot, while saying whole foods can meet the need [2].
What matters after which workout?
This table is our summary of the ISSN position stands [1][2]. It is a way to think about priorities, not a plan for you.
| Your session | Your next session | What matters most afterwards |
|---|---|---|
| Lifting or strength work | Tomorrow | Protein at your next meal or snack. Timing is flexible |
| Lifting or strength work | Later today | Protein plus carbohydrate soon after |
| Long run, ride, swim or row | Tomorrow | Carbohydrate across the day, protein, fluids |
| Long endurance session | Within about 4 hours | Carbohydrate soon after, with some protein [1] |
| Hot, sweaty practice | Any | Fluid and electrolytes, then a normal meal |
| Two a day practices | Same day | Plan the gap: carbohydrate, protein and fluid between sessions |
Notice what is missing: no row needs a special post workout formula.
Is the anabolic window real?
Partly. Muscle is more responsive to protein after training, but the window is wide. The ISSN protein position stand says the anabolic effect of exercise is "long-lasting (at least 24 h), but likely diminishes with increasing time post-exercise" [2]. The NIH Office of Dietary Supplements describes a meta analysis that found protein within an hour before or after exercise did not significantly increase strength or muscle size [3].
The practical reading: eat protein after training because it is a sensible time to eat, not because a timer runs out. If your last meal was hours before practice, getting protein in soon after matters more [1].
What about creatine, BCAAs and glutamine?
Creatine. Creatine is one of the few supplements the IOC says may give "marginal performance gains" [4], and the NIH says the benefit shows up mainly in high intensity, intermittent activity [3]. It works by raising the creatine stored in muscle, which takes days or weeks of daily use, and stores fall back over about 4 to 6 weeks after stopping [6]. That makes it a daily habit, not a post workout product. NCAA Division I schools cannot provide it [7], and our creatine guide explains why it is still not banned.
BCAAs. The NIH says studies "have not consistently shown" that BCAA supplements improve performance, build muscle or aid recovery, and that complete proteins such as whey already supply them [3]. More in our BCAA guide.
Glutamine. The NIH says research "does not support taking glutamine alone" to improve performance [3].
For the wider recovery category, including tart cherry and omega 3s, see muscle recovery supplements.
Why do tested athletes need to be careful with post workout products?
Because "post workout" usually means a blend. The IOC consensus notes that protein supplements and sports bars "may contain other ingredients, some of which are not evidence-based and may increase the risk of contamination" [4]. The NIH, citing the FDA, says products marketed for bodybuilding are among those "most often adulterated" with undeclared steroids or prescription drugs [3].
The NCAA's own banned substances list warns that supplements "may be contaminated with banned substances not listed on the label" and that even with third party tested products "complete elimination of risk is impossible" [5]. In Olympic sport, the World Anti-Doping Code's strict liability rule means a positive counts even when it was unintentional [4].
So the lower risk choice is the plain one: a single protein or carbohydrate product, certified by a banned substance testing program, with its lot or batch checked on the certifier's site. Our certification comparison explains NSF Certified for Sport, Informed Sport and BSCG.
Can a college team give you a post workout shake?
Yes, if it fits an allowed class. NCAA Division I Bylaw 16.5.2.7 lets a school provide nutritional supplements "for the purpose of providing additional calories and electrolytes" if they contain no NCAA banned substances [7]. The allowed classes are:
- carbohydrate and electrolyte drinks
- energy bars
- carbohydrate boosters
- protein supplements
- omega 3 fatty acids
- vitamins and minerals
A protein shake or a recovery drink with carbohydrate fits. A product with creatine or other added ingredients outside those classes is one a school cannot hand out, even if you may buy it yourself. Our protein powder guide covers the details, and your compliance office has the final word.
What about high school athletes?
High school athletes should talk to a parent, doctor or registered dietitian before using any supplement. The NIH advises care with supplements for children unless a health care provider recommends them, because many have not been well tested in children [8]. Food after practice covers what most young athletes need.
Checklist before you buy a post workout supplement
- Scan it in Varsity Stack first. Check the barcode or label against our certification database before you buy.
- Ask your athletics staff. The NCAA makes checking your responsibility [5].
- Prefer a single ingredient product. Plain protein or a carbohydrate drink beats a blend with a long ingredient list [4].
- Skip anything sold on muscle building or hormone claims. That is where hidden steroids turn up [3].
- Choose a product certified by a banned substance testing program, and check the lot or batch number on the certifier's own site.
- Check food first. If a meal after training covers protein and carbohydrate, you may not need a supplement at all.
Check your post workout supplement with Varsity Stack
The fastest way to check a protein powder or recovery drink is the free Varsity Stack app. Scan the barcode or snap a photo of the label, and Varsity Stack checks it against our certification database before you buy. Then log it with the rest of your stack, so you and your staff always know what you are taking.
For coaches, sports dietitians and athletic trainers: the team dashboard shows every athlete's stack, the certification status of each product and its full ingredient panel. Athletes scan what they buy, and staff approve or reject it for the roster, for example a recovery blend with ingredients outside the allowed classes. Request access for your program.
Varsity Stack does not laboratory test supplements, and certification lowers risk without removing it.
This article is for educational purposes only. Consult a qualified healthcare provider or registered dietitian before starting any supplement regimen.
Sources
- Kerksick CM and colleagues, International Society of Sports Nutrition position stand: nutrient timing, Journal of the International Society of Sports Nutrition, 2017
- Jäger R and colleagues, International Society of Sports Nutrition Position Stand: protein and exercise, Journal of the International Society of Sports Nutrition, 2017
- NIH Office of Dietary Supplements, Dietary Supplements for Exercise and Athletic Performance, Health Professional Fact Sheet (updated April 1, 2024)
- Maughan RJ and colleagues, IOC consensus statement: dietary supplements and the high-performance athlete, British Journal of Sports Medicine, 2018
- NCAA, 2026 to 27 NCAA Banned Substances
- Kreider RB and colleagues, International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine, Journal of the International Society of Sports Nutrition, 2017
- NCAA, 2026 to 27 NCAA Division I Manual, Bylaw 16.5.2.7 Nutritional Supplements
- NIH Office of Dietary Supplements, Dietary Supplements: What You Need to Know
