Here are five nutrients with the best evidence for supporting fluid balance, blood vessel health, and reducing swelling.
1. Potassium
Why it helps:
Potassium helps regulate the body’s fluid balance by working with sodium. Too much sodium causes water retention, while adequate potassium encourages the kidneys to excrete excess sodium.
Benefits
- Reduces water retention
- Supports healthy blood pressure
- Helps prevent muscle cramps
Best food sources
- Bananas
- Sweet potatoes
- Spinach
- Avocados
- Tomatoes
- Oranges
- Coconut water
- White beans
Recommended intake
- Women: about 2,600 mg/day
- Men: about 3,400 mg/day
Important: If you have kidney disease or take medications such as ACE inhibitors or potassium-sparing diuretics, do not increase potassium intake without medical advice.
2. Magnesium
Why it helps:
Magnesium supports muscle relaxation, healthy circulation, and normal fluid balance. Low magnesium levels have been associated with fluid retention in some people.
Benefits
- May reduce mild swelling
- Supports healthy circulation
- Helps reduce leg cramps
- Supports nerve and muscle function
Best food sources
- Pumpkin seeds
- Almonds
- Cashews
- Dark leafy greens
- Whole grains
- Black beans
Recommended intake
- Women: 310–320 mg/day
- Men: 400–420 mg/day
Some people who are deficient may benefit from supplements, but high doses can cause diarrhea.
3. Vitamin B6
Why it helps:
Vitamin B6 plays a role in fluid regulation and hormone metabolism. It has shown benefit for reducing fluid retention associated with premenstrual syndrome (PMS).
Benefits
- May reduce water retention
- Supports protein metabolism
- Supports nervous system function
Best food sources
- Chicken
- Turkey
- Salmon
- Potatoes
- Bananas
- Chickpeas
Recommended intake
Adults: 1.3–1.7 mg/day
Avoid long-term high-dose supplements (over 100 mg/day), as they can damage nerves.
4. Vitamin C
Why it helps:
Vitamin C is essential for collagen production, helping keep blood vessels strong. Stronger capillaries are less likely to leak fluid into surrounding tissues.
Benefits
- Supports healthy blood vessels
- Helps reduce inflammation
- Promotes wound healing
- Acts as an antioxidant
Best food sources
- Oranges
- Kiwi
- Strawberries
- Bell peppers
- Broccoli
- Guava
Recommended intake
- Women: 75 mg/day
- Men: 90 mg/day
5. Protein (especially Albumin)
Why it helps:
Low protein intake can lower blood albumin levels. Albumin helps keep fluid inside blood vessels. When albumin is too low, fluid can leak into tissues, causing swelling.
Benefits
- Helps maintain normal fluid balance
- Supports muscle health
- Aids healing
- Reduces swelling caused by protein deficiency
Best food sources
- Eggs
- Fish
- Chicken
- Greek yogurt
- Lentils
- Beans
- Tofu
Aim for roughly 0.8 grams of protein per kilogram of body weight daily, unless your healthcare provider recommends otherwise.
Other nutrients that may help
- Flavonoids (found in berries and citrus fruits) may support vein health.
- Omega-3 fatty acids (from salmon, sardines, flaxseed, and walnuts) may help reduce inflammation.
- Vitamin E has limited evidence for improving circulation in some people but is not a primary treatment for swelling.
Lifestyle tips to reduce swelling
- Reduce sodium intake (aim for less than 2,300 mg/day, or less if advised by your clinician).
- Stay physically active and walk regularly.
- Elevate your legs above heart level for 20–30 minutes several times a day.
- Avoid sitting or standing in one position for long periods.
- Stay well hydrated.
- Wear compression stockings if recommended by a healthcare professional.
- Maintain a healthy body weight.
When to seek medical care
Seek urgent medical attention if swelling:
- Appears suddenly in one leg, especially with pain, redness, or warmth (possible blood clot).
- Is accompanied by chest pain or shortness of breath.
- Occurs with severe pain, fever, or significant skin changes.
Arrange a medical evaluation if swelling:
- Persists for more than a few days.
- Keeps recurring.
- Is accompanied by weight gain, fatigue, or swelling elsewhere (such as the abdomen or face), as these may indicate heart, kidney, liver, or vein problems.
Nutrients can support overall health, but identifying and treating the underlying cause is the most effective way to reduce persistent swelling in the feet and legs.