In our previous article, we explored whether supplements are necessary and why many people struggle to get optimal nutrition from food alone.
That naturally leads to the next question:
What nutrients are people commonly low in, and which supplements are worth considering?
While a balanced diet should always be the foundation of good health, certain nutrient deficiencies are more common. We all experience busy lifestyles, stress, aging, dietary restrictions, limited sun exposure, digestive challenges, and highly processed diets, which can make it harder to meet our nutritional needs.
Let's take a look at some of the most common nutrient gaps and where supplementation may play a helpful role.
Vitamin D
The Sunshine Vitamin Many People Lack
Vitamin D is one of the most common nutrient deficiencies worldwide.
Our bodies naturally produce vitamin D when our skin is exposed to sunlight, but modern lifestyles often keep us indoors for much of the day. During colder months, vitamin D production may be reduced even further.
Vitamin D plays an important role in:
- Bone health
- Immune function
- Muscle function
- Overall wellness
Possible Signs of Low Vitamin D
- Frequent illness
- Fatigue or low energy
- Muscle weakness
- Bone or joint discomfort
- Low mood
- Slow recovery from illness
Not everyone with low vitamin D experiences symptoms, which is why testing is often the most reliable way to identify a deficiency.
Food sources include fatty fish, egg yolks, and fortified foods like plant milk and nutritional yeast, but it can be difficult to obtain optimal amounts through diet alone.
Magnesium
The Mineral Modern Life Seems to Drain
Magnesium is involved in hundreds of processes throughout the body, yet many people don't consume enough of it regularly.
Stress, highly processed foods, certain medications, and poor dietary habits can all contribute to low magnesium intake.
Magnesium supports:
- Muscle function
- Nervous system health
- Energy production
- Sleep quality
- Bone health
Low magnesium levels may contribute to:
- Muscle cramps or twitching
- Difficulty relaxing
- Poor sleep quality
- Fatigue
- Headaches
- Increased feelings of stress or tension
Because magnesium is involved in so many processes throughout the body, symptoms can vary significantly from person to person.
Foods rich in magnesium include leafy greens, beans, lentils, nuts, seeds, and whole grains.
Vitamin B12
Especially Important for Plant-Based Eaters
Vitamin B12 helps support:
- Energy production
- Red blood cell formation
- Nervous system function
Possible Signs of Low Vitamin B12
- Fatigue
- Weakness
- Brain fog
- Difficulty concentrating
- Tingling or numbness in the hands and feet
- Mood changes
Vitamin B12 deficiencies can develop gradually and may go unnoticed for years.
Unlike many nutrients, vitamin B12 is found primarily in animal-derived foods.
Because of this, vegetarians and vegans often need to pay special attention to their B12 intake. Older adults may also have a harder time absorbing B12 as they age.
Fortified foods can help, but supplementation is often recommended for individuals who avoid animal products.
Omega-3 Fatty Acids
A Common Nutritional Gap
Omega-3 fats play an important role in overall health and wellness.
Unfortunately, many modern diets contain plenty of omega-6 fats but relatively little omega-3.
Omega-3s support:
- Heart health
- Brain health
- Eye health
- Healthy inflammatory responses
While omega-3 deficiency can be difficult to identify, some people may notice:
- Dry skin
- Dry eyes
- Difficulty concentrating
- Mood changes
- Joint discomfort
- Low seafood intake
Fatty fish such as salmon, sardines, and mackerel are excellent sources of omega-3s.
For those following a plant-based lifestyle, flax seeds, chia seeds, walnuts, hemp seeds, and algae-based omega-3 supplements can help bridge the gap.
Iron
Important, But Not for Everyone
Iron is essential for carrying oxygen throughout the body.
Women of childbearing age, pregnant women, and individuals with certain health conditions are often at greater risk of iron deficiency.
Iron deficiency may contribute to:
- Fatigue
- Weakness
- Dizziness
- Shortness of breath during activity
- Pale skin
- Feeling unusually cold
Because excess iron can also pose health risks, supplementation should ideally follow testing and professional guidance.
Common food sources include:
- Beans and lentils
- Tofu
- Pumpkin seeds
- Dark leafy greens
- Fortified cereals
However, iron is one nutrient that should not be supplemented blindly.
Both too little and too much iron can be problematic. If iron deficiency is suspected, testing is often the best first step.
Zinc
A Nutrient Many People Overlook
Zinc doesn't always get the attention of nutrients like vitamin D or magnesium, but it plays an important role in many bodily functions.
Zinc supports:
- Immune function
- Wound healing
- Cell growth
- Protein synthesis
Possible Signs of Low Zinc
- Frequent illness
- Slow wound healing
- Changes in taste or smell
- Hair thinning
- Poor appetite
- Skin concerns
Good food sources include legumes, nuts, seeds, whole grains, and animal products.
Plant-based eaters may need to pay extra attention to zinc intake because certain plant compounds can reduce absorption.
Iodine
A Small Nutrient With a Big Job
Iodine may not get as much attention as vitamin D or magnesium, but it plays a critical role in overall health.
This essential mineral is needed for the production of thyroid hormones, which help regulate metabolism, energy levels, growth, and many other important functions throughout the body.
Possible Signs of Low Iodine
- Fatigue
- Feeling cold frequently
- Dry skin
- Hair thinning
- Difficulty concentrating
- Unexplained weight gain
Good sources of iodine include seafood, sea vegetables, dairy products, and iodized salt.
However, people who follow plant-based diets, avoid dairy, eat little seafood, or use non-iodized specialty salts may not get enough iodine consistently.
Vitamin C
A Popular Nutrient for Everyday Wellness
People who regularly eat a variety of fruits and vegetables can often meet their vitamin C needs through food alone.
However, some individuals may benefit from supplementation, particularly during seasons when fresh produce intake is lower or when dietary habits aren't as consistent.
Vitamin C supports:
- Immune function
- Collagen production
- Skin health
- Wound healing
- Antioxidant protection
Possible Signs of Low Vitamin C
- Frequent illness
- Slow wound healing
- Easy bruising
- Bleeding gums
- Dry or rough skin
- Persistent fatigue
Severe vitamin C deficiency is uncommon in developed countries, but low intake can still occur.
The truth is that no article can tell you exactly which supplements you need.
Factors such as age, diet, health conditions, medications, lifestyle, and activity level all influence nutritional needs.
Some people may benefit from supplementation, while others may already be meeting their needs through food.
When possible, laboratory testing and conversations with a qualified healthcare professional can provide valuable insight into potential nutrient deficiencies.
A nutrient-dense diet built around whole foods remains the best place to start.
Supplements can be helpful tools for filling common nutritional gaps, but they work best when they support—not replace—a healthy lifestyle.
Rather than asking, "What supplements should I take?" a better question may be:
"Where might I have nutritional gaps, and how can I address them through food and thoughtful supplementation?"
That approach is often the most practical, sustainable, and effective path toward long-term wellness!
Disclaimer:
It's important to note that symptoms alone cannot diagnose a nutrient deficiency. Many symptoms can have multiple causes. If you suspect a deficiency, testing and guidance from a qualified healthcare professional can help provide clarity.
