Women over 50 need 75 mg of vitamin C per day, the same recommendation that applies to all adult women. This number doesn’t change with age. If you smoke, add 35 mg to that baseline, bringing your target to 110 mg daily. These are the figures set by the National Academies’ Food and Nutrition Board, and they represent the amount needed to maintain a near-maximal body pool of vitamin C in most people.
That said, 75 mg is a minimum target, not necessarily an optimal one. Many researchers and nutrition experts suggest that intakes in the range of 200 to 500 mg offer additional benefits, particularly for concerns that become more relevant after 50: bone density, skin aging, eye health, and immune function. The safe upper limit is 2,000 mg per day, so there’s a wide range to work within.
Why 75 mg Is the Floor, Not the Ceiling
The 75 mg recommendation is designed to prevent deficiency and maintain basic health in most women. But your body’s vitamin C levels in tissues like skin plateau at a higher intake than 75 mg. Oral supplementation effectively increases vitamin C concentrations in the skin, for instance, but only up to the point where blood plasma levels are saturated. That saturation happens at intakes closer to 200 mg per day.
Vitamin C plays a direct role in stabilizing collagen, the protein that gives skin its structure and firmness. It increases collagen production and boosts the activity of fibroblasts, the cells that build connective tissue. This activity naturally slows with age, which is one reason skin thins and wrinkles deepen after menopause. Getting enough vitamin C won’t reverse aging, but it supports the repair machinery your body already has.
Bone Density After Menopause
Bone loss accelerates after menopause, and vitamin C’s role in collagen synthesis extends to bone tissue. A study of postmenopausal women in Washington State found that dietary vitamin C alone (averaging about 113 mg per day) showed no measurable difference in bone mineral density. However, women aged 55 to 64 who took vitamin C supplements for 10 years or longer had significantly higher bone density than non-users in the same age group.
This benefit was most pronounced in women who had never used estrogen replacement therapy. It wasn’t evident in older age groups or in women who had previously used estrogen. The takeaway: consistent, long-term vitamin C intake may offer the most bone-protective value in the earlier postmenopausal years, especially if you’re not on hormone therapy.
Eye Health and Cataract Risk
Cataracts become increasingly common after 50, and vitamin C concentrations in the lens of the eye are naturally high. USDA-funded research found that women who took vitamin C supplements daily for more than 10 years had 77 percent fewer early-stage cataracts than women who didn’t supplement. That’s a striking reduction, though it reflects long-term, consistent use rather than short-term supplementation.
As with bone density, the pattern here points to the same conclusion: the benefits of vitamin C beyond the bare minimum tend to show up over years, not weeks.
Best Food Sources
Reaching 75 mg from food alone is easy. A single medium orange provides about 70 mg. A cup of strawberries delivers around 85 mg. Red bell pepper is one of the richest sources, with a half-cup of raw red pepper containing roughly 95 mg. Other strong options include broccoli, kiwi, Brussels sprouts, and cantaloupe.
If you’re aiming for 200 mg or more through diet, eating several servings of fruits and vegetables throughout the day will get you there comfortably. Vitamin C is water-soluble and sensitive to heat, so raw or lightly cooked produce retains more of it than heavily boiled vegetables.
Supplements: How Much Is Too Much
The tolerable upper limit for adults is 2,000 mg per day. Going above that consistently increases the risk of digestive problems like diarrhea, nausea, and abdominal cramps, caused by unabsorbed vitamin C drawing water into the intestines.
There’s also a theoretical concern about kidney stones. High vitamin C intake can increase urinary oxalate, a building block of the most common type of kidney stone. The evidence on this is mixed for healthy people, but the risk is more concrete if you have a history of kidney problems or a condition that causes high oxalate levels. If that applies to you, staying well below the upper limit is a reasonable precaution.
For most women over 50, a supplement in the 250 to 500 mg range, combined with a diet that includes fruits and vegetables, provides intake well above the minimum without approaching the upper limit. Your body excretes what it doesn’t need, so mega-doses offer no added benefit and only increase the chance of side effects.
If You Smoke
Smoking increases oxidative stress and speeds up how quickly your body uses vitamin C. The National Academies recommend that smokers consume an additional 35 mg per day beyond the standard recommendation. For women, that means a minimum of 110 mg daily. In practice, if you smoke and are over 50, aiming for 200 mg or more through food and supplements covers this increased need with a comfortable margin.
Interactions Worth Knowing About
Vitamin C can increase your absorption of aluminum from certain medications, including some antacids and phosphate binders. This is primarily a concern if you have kidney disease, since your body may not clear the extra aluminum efficiently. Vitamin C may also interact with certain cancer treatments, so if you’re undergoing chemotherapy, discuss supplementation with your oncologist before adding or changing your dose.