Your body clears lactic acid on its own, and it does so surprisingly fast. After even the most intense exercise, blood lactate levels typically return to baseline within 60 to 90 minutes. The real question isn’t whether lactic acid will leave your muscles, but whether you can speed up the process and reduce that burning sensation during your next workout. The answer to both is yes.
What Actually Happens to Lactic Acid
When you exercise hard enough that your muscles can’t get oxygen fast enough, your body starts breaking down glucose without oxygen and produces lactate as a byproduct. That burning feeling during a tough set of squats or the last stretch of a sprint? That’s partly the acid buildup interfering with muscle contraction.
But your body has a built-in recycling system. Lactate travels through your bloodstream to the liver, where it gets converted back into glucose your muscles can use again. This loop, called the Cori cycle, is one of the main ways your body clears lactate. Your kidneys also pitch in, taking up lactate from the blood and converting some of it to glucose as well. On top of that, when oxygen becomes available again (you stop sprinting, you rest between sets), your muscles themselves can convert lactate back into usable fuel.
After moderate exercise, blood lactate clears in roughly 60 to 90 minutes of passive rest. After an all-out effort like a 30-second sprint test, full clearance can take closer to two to three hours. But there are several ways to cut that timeline shorter.
Active Recovery Clears Lactate Faster
The single most effective thing you can do after intense exercise is keep moving at a low intensity. Light jogging after a hard run, easy spinning on a bike after intervals, or a relaxed walk after a lifting session all accelerate lactate clearance compared to sitting still. Studies on cyclists show that moderate-intensity active recovery produces significantly greater lactate clearance starting within just seven minutes of the cooldown.
The mechanism is straightforward: light movement keeps blood flowing through your muscles, which pushes lactate into the bloodstream faster and delivers it to the liver and kidneys for processing. Aim for an effort level that feels easy, something you could hold a full conversation during. Five to fifteen minutes is enough to make a measurable difference.
Lactic Acid Doesn’t Cause Next-Day Soreness
This is one of the most persistent myths in fitness. The soreness you feel a day or two after a hard workout is not caused by lactic acid sitting in your muscles. Lactate clears far too quickly to be responsible for pain that shows up 24 to 48 hours later.
That delayed soreness comes from microtears in your muscle fibers, tiny structural damage caused by the exercise itself, especially movements your body isn’t used to or exercises with a strong lowering (eccentric) component. These microtears trigger inflammation, which is what you feel as stiffness and tenderness. The good news: repairing those tears is exactly how muscles grow bigger and stronger. So if you’re searching for ways to get rid of lactic acid because you’re sore the day after a workout, the lactic acid is long gone. Your soreness has a different cause entirely.
Train Your Body to Handle Lactate Better
Rather than just clearing lactate after the fact, you can train your body to produce less of it at any given intensity and clear it more efficiently while you’re still exercising. This is what coaches mean by “raising your lactate threshold,” the exercise intensity at which lactate starts accumulating faster than your body can process it.
In untrained people, the lactate threshold kicks in at about 50 to 60% of maximum heart rate reserve. In trained athletes, it doesn’t hit until 80 to 90%. That gap represents a huge range of intensities where a fit person can work hard without drowning in acid buildup. Three types of training shift this threshold:
- High-volume, low-intensity work: The foundation. Long, easy sessions at an effort that feels light, making up the bulk of your weekly training. Increase volume gradually, no more than 10 to 20% per week.
- Steady-state sessions at threshold: Working at an intensity that feels “somewhat hard” to “hard,” right around where your body is processing lactate as fast as it’s producing it. These sessions should make up no more than 10% of your total weekly training volume.
- Intervals above threshold: Short bursts at a “hard” to “very hard” effort with easy recovery periods in between. Like threshold work, these should stay under 10% of weekly volume. The rest of your training stays easy.
The combination of all three produces the most pronounced improvements in lactate threshold. Over weeks and months, your muscles develop more capillaries, more energy-producing structures inside cells, and greater capacity to use lactate as fuel rather than letting it accumulate.
Foam Rolling and Massage
Foam rolling after exercise improves local blood flow and has shown advantages in metabolic recovery, including faster blood lactate clearance. It works through a similar principle as active recovery: increased circulation moves lactate out of the muscles and toward the organs that process it. Rolling major muscle groups for five to ten minutes after a hard session can complement a light cooldown, though it’s not a replacement for active recovery.
Professional sports massage operates on the same idea but with more targeted pressure. Neither foam rolling nor massage will eliminate next-day soreness (since that’s caused by muscle damage, not lactate), but both can help your muscles feel less heavy and fatigued in the short term.
Supplements That Buffer Acid Buildup
Two supplements have enough evidence behind them that the American College of Sports Medicine recognizes their potential for improving buffering capacity during exercise.
Sodium bicarbonate (essentially baking soda) works by creating a chemical gradient that helps pull acid out of muscle cells during intense exercise. Research on cyclists found that a dose of 0.3 grams per kilogram of body weight improved both performance and lactate levels compared to a lower dose or placebo. For a 70-kilogram (154-pound) person, that’s about 21 grams. The catch: doses this high commonly cause stomach distress, including bloating, cramping, and nausea. Splitting the dose before and during exercise can help.
Beta-alanine works differently. It increases levels of a compound inside your muscles that directly buffers acid during high-intensity effort. It’s typically taken daily over several weeks to build up stores, rather than as a single pre-workout dose. The most common side effect is a harmless tingling sensation in the skin.
Both supplements are most relevant for athletes doing repeated high-intensity efforts, like sprints, rowing intervals, or competitive cycling. If you’re doing moderate exercise or standard gym workouts, proper cooldowns and consistent training will do more for you than supplementation.
A Simple Post-Workout Routine
Putting this together into practice: after your next hard workout, spend 5 to 15 minutes doing light movement. Walk, pedal slowly, or swim easy laps. Follow that with a few minutes of foam rolling on the muscles you worked hardest. Stay hydrated, since your liver and kidneys need adequate fluid to do their jobs efficiently. That combination covers the controllable factors in lactate clearance. Your body handles the rest automatically.