A shot of lemon juice (about 1 to 2 ounces) delivers a meaningful dose of vitamin C, plant compounds with antioxidant effects, and enough citric acid to potentially help prevent kidney stones. It’s a legitimately healthy habit for most people, with a few caveats worth knowing about, especially for your teeth and digestive tract.
What’s Actually in a Shot of Lemon Juice
One cup of raw lemon juice contains about 94 mg of vitamin C. A single ounce (roughly two tablespoons) works out to around 12 mg, so a standard 1- to 2-ounce shot gives you 12 to 24 mg of vitamin C, or roughly 13 to 27 percent of the daily recommended intake. That’s a solid contribution from such a small volume of liquid, though it won’t single-handedly meet your daily needs.
Beyond vitamin C, lemon juice contains flavonoids, a category of plant compounds that act as antioxidants. The primary one in lemons is eriocitrin, which has shown consistent antioxidant activity in the liver and intestines in research studies. Clinical trials have found that eriocitrin can reduce oxidative stress in people with metabolic conditions like diabetes, and animal research suggests it may help reduce fat accumulation in the liver. Lemons also contain smaller amounts of hesperidin and naringin, flavonoids found across citrus fruits. These compounds appear to influence cholesterol metabolism, particularly by lowering certain cholesterol byproducts in the liver and intestines.
Kidney Stone Prevention
This is one of the strongest practical reasons to make lemon juice a regular habit. The citric acid in lemon juice raises urinary citrate levels, and citrate binds to calcium in urine, making it harder for calcium-based kidney stones to form. Harvard Health reports that drinking the juice of two lemons per day (diluted in water) can increase urine citrate enough to likely reduce kidney stone risk. A single shot doesn’t quite reach that threshold, but it contributes meaningfully, especially if you’re also getting citrate from other foods.
Better Iron Absorption From Plant Foods
If you eat a plant-heavy diet, the vitamin C in lemon juice can make a real difference in how much iron your body absorbs. Non-heme iron, the type found in beans, lentils, spinach, and grains, is poorly absorbed on its own. Research published in ACS Omega found that iron absorption from a meal can increase from 0.8% to 7.1% when vitamin C is added, nearly a ninefold jump. The key detail: the vitamin C needs to be consumed at the same meal. Taking it hours before is far less effective. So squeezing lemon juice over a salad or taking a shot alongside a plant-based meal is a simple way to get more iron from food you’re already eating.
The Tooth Enamel Problem
Lemon juice has a pH of 2 to 3, which is highly acidic. Dental enamel starts to break down when exposed to liquids below a pH of 4, so straight lemon juice clears that threshold easily. Drinking undiluted shots regularly can soften and erode enamel over time, making teeth more sensitive and more vulnerable to cavities.
A few habits minimize the damage. Drinking through a straw sends the liquid past your teeth. Rinsing your mouth with plain water immediately after helps neutralize the acid. Chewing sugar-free gum afterward promotes saliva production, which is your mouth’s natural defense against acid. One important note: don’t brush your teeth right after. Acid-softened enamel is temporarily more fragile, and brushing too soon or too aggressively can wear it down further. Waiting 30 minutes before brushing is a good rule of thumb. Diluting your shot in 12 to 16 ounces of water also drops the acidity to a level that’s far less harmful to enamel.
Acid Reflux and Digestive Sensitivity
Citrus fruits are a well-known trigger for acid reflux. They can relax the lower esophageal sphincter, the valve between your esophagus and stomach, and slow digestion, which lets food sit in the stomach longer and increases the chance of acid creeping upward. If you already deal with heartburn or GERD, a concentrated shot of lemon juice on an empty stomach is likely to make symptoms worse.
Interestingly, Johns Hopkins notes that a small amount of lemon juice mixed with warm water and honey can have a neutralizing effect on stomach acid for some people. The difference seems to come down to concentration: a straight shot is far more irritating than a diluted version. If your stomach handles it fine, there’s no reason to avoid it. If you notice burning or discomfort, diluting is the obvious fix.
How to Get the Most From It
The ideal approach depends on why you’re drinking it. For kidney stone prevention, aim for the juice of two lemons daily, diluted in water and spread throughout the day. For an iron absorption boost, time your shot with meals that contain plant-based iron sources. For general vitamin C and antioxidant intake, a single morning shot works, though diluting it in water protects your teeth and stomach without reducing the nutritional benefit.
Fresh-squeezed lemon juice retains more vitamin C and flavonoids than bottled versions, which can lose potency during pasteurization and storage. If you’re using bottled juice, it still works, but fresh is a step up nutritionally. Either way, keeping the juice cold and using it within a few days helps preserve the vitamin C content, which degrades with heat and light exposure.