“Blood levels” can refer to several different things, and the right approach depends on what’s actually low. The most common reasons people search for this are low iron or hemoglobin, low blood sugar, low blood pressure, or low oxygen levels. Each has distinct causes and specific ways to bring levels back up. Here’s what works for each one.
Raising Iron and Hemoglobin Levels
Low iron is the single most common nutritional deficiency worldwide, and it directly causes low hemoglobin, the protein in red blood cells that carries oxygen. A ferritin level (your body’s iron storage marker) below 30 ng/mL strongly suggests iron deficiency, with sensitivity around 92%. Levels above 100 ng/mL generally rule it out. If you have chronic inflammation from conditions like rheumatoid arthritis or inflammatory bowel disease, iron deficiency is likely when ferritin drops below 50 ng/mL.
For diagnosed iron deficiency, the standard treatment is about 120 mg of elemental iron per day for three months. That’s an important distinction: “elemental iron” is only a fraction of what’s listed on a supplement bottle. A 325 mg ferrous sulfate tablet contains just 65 mg of elemental iron, so three tablets daily gets you to 195 mg. Your body doesn’t absorb all of it, which is why the doses seem high.
Food sources of iron fall into two categories. Heme iron, found in meat, poultry, and seafood, has an absorption rate of about 25%. Non-heme iron from plant sources like beans, lentils, spinach, and fortified grains absorbs at 17% or less. That gap matters if you’re relying on plants alone. Vitamin C significantly boosts non-heme iron absorption by converting it into a form your gut can take up more easily. Eating citrus fruits, bell peppers, or tomatoes alongside iron-rich meals makes a real difference. On the flip side, tea, coffee, red wine, and dairy all contain compounds that block iron absorption, so spacing these away from iron-rich meals helps.
Folate and B12 for Red Blood Cell Production
Iron isn’t the only nutrient your body needs to build red blood cells. Folate and vitamin B12 are both essential for DNA synthesis during cell division, and when either is deficient, your bone marrow produces abnormally large, dysfunctional red blood cells. This condition, called megaloblastic anemia, looks different from iron deficiency on blood work but can cause similar fatigue and weakness.
Adults need 400 mcg of dietary folate equivalents per day (600 mcg during pregnancy). Good sources include leafy greens, fortified cereals, and legumes. For B12, normal blood levels range from 160 to 950 pg/mL, and values below 160 pg/mL suggest deficiency. B12 is found almost exclusively in animal products: meat, fish, eggs, and dairy. People following a vegan diet, adults over 50 (who often absorb B12 poorly), and anyone with digestive conditions affecting the stomach or small intestine are at highest risk for deficiency and typically need supplementation.
Raising Low Blood Sugar Quickly
If your blood sugar drops below 70 mg/dL, the CDC recommends the 15-15 rule: eat 15 grams of fast-acting carbohydrates, wait 15 minutes, then recheck. If you’re still below 70, repeat. Good options for those 15 grams include four glucose tablets, half a cup of juice or regular soda, or a tablespoon of honey. The key is choosing simple sugars that hit your bloodstream fast, not complex carbs or foods with fat and protein that slow digestion.
Once your blood sugar returns to your target range, eating a small meal or snack with protein and complex carbs helps prevent another drop. If low blood sugar episodes happen repeatedly, that pattern is worth tracking and discussing with a provider, since it often signals a need to adjust medication timing or dosing.
Raising Low Blood Pressure
Chronically low blood pressure, especially the kind that causes dizziness when you stand up, responds well to increasing both salt and fluid intake. The logic is straightforward: sodium pulls water into your bloodstream, expanding plasma volume, which raises pressure. For people with orthostatic hypotension or frequent fainting, clinical recommendations call for 10 to 20 grams of salt daily, far above the 5 to 6 grams most healthy adults consume.
That level of sodium intake is specifically for people with diagnosed low blood pressure and would be harmful for someone with normal or high blood pressure. Practical ways to increase salt include adding it liberally to meals, eating broth-based soups, and choosing salted snacks. Drinking enough water matters just as much, since sodium without adequate fluid won’t expand your blood volume effectively. Most recommendations pair the increased salt with 2 to 3 liters of water throughout the day. Compression stockings and elevating the head of your bed slightly also help by preventing blood from pooling in your legs overnight.
Improving Blood Oxygen Levels
Normal blood oxygen saturation (SpO2) falls between 95% and 100% when measured by a pulse oximeter. Readings consistently below 95% indicate your blood isn’t carrying enough oxygen. The causes range from lung conditions like asthma or COPD to temporary situations like pneumonia or high altitude.
Deep, slow breathing is the simplest way to improve oxygen levels in the short term. Pursed-lip breathing, where you inhale through your nose for two counts and exhale slowly through pursed lips for four counts, helps keep your airways open longer and improves gas exchange. Positioning matters too: sitting upright or leaning slightly forward gives your lungs more room to expand than lying flat. If you’re recovering from illness, gentle movement like short walks encourages deeper breathing and helps your lungs clear mucus. For people with chronic lung disease, supplemental oxygen prescribed at specific flow rates is often the only way to keep saturation in a safe range.
Supporting Platelet Counts
Low platelet counts (thrombocytopenia) make it harder for your blood to clot, leading to easy bruising and prolonged bleeding. Research from Boston Children’s Hospital found that polyunsaturated fatty acids, the type of fat abundant in olive oil, fatty fish, nuts, and seeds, play a direct role in platelet production. In lab studies, the cells responsible for making platelets had higher concentrations of these fats right before they began producing new platelets. The fats appear to give cell membranes the flexibility needed to reshape and release platelets.
Diets high in saturated fat had the opposite effect, reducing platelet production. A Mediterranean-style eating pattern, rich in olive oil, fish, vegetables, and whole grains, aligns well with these findings. While diet alone won’t reverse severe thrombocytopenia, it may support platelet recovery alongside medical treatment, and it’s a reasonable shift for anyone with borderline-low counts.