Walk into almost any health store, and you'll find hundreds of supplements promising better health, more energy, stronger immunity, improved focus, and faster recovery.
The challenge isn't finding supplements. It's knowing which ones have meaningful scientific support, which ones fit your actual needs, and whether taking them makes sense in the first place.
No supplement is a miracle cure, and evidence that a nutrient is important does not automatically mean everyone benefits from taking more of it. Some supplements are most useful for correcting a deficiency, others can help fill a dietary gap, and a few—such as creatine—have well-established performance benefits even when deficiency is not the issue.
Here are six widely studied supplements that may be useful in the right circumstances, along with what the evidence says, why they're used, and who may benefit most.
Why These Six Supplements?
There are thousands of dietary supplements on the market, so this list is not meant to suggest that these are the only useful options—or that everyone should take all six.
They were selected because they represent several different situations in which supplementation may be appropriate:
- Vitamin D and vitamin B12 can be especially useful when intake or status is low.
- Magnesium may help fill a dietary gap when intake is inadequate.
- Omega-3 fatty acids can provide EPA and DHA when fatty fish intake is limited.
- Probiotics may be useful for specific digestive or health concerns when an appropriate strain is selected.
- Creatine monohydrate is an evidence-based performance supplement that can improve high-intensity exercise capacity and support resistance-training adaptations.
The important question is not simply whether a supplement has been studied. It's whether the evidence applies to your goal, diet, health status, and individual needs.
1. Vitamin D
Vitamin D plays important roles in calcium absorption, bone health, muscle function, and normal immune function.
Some people are at greater risk of inadequate vitamin D status, including those with limited sun exposure, certain malabsorption conditions, older adults, and people whose diets provide little vitamin D.
Good dietary sources include:
- Fatty fish
- Egg yolks
- Fortified milk
- Fortified plant beverages
- Fortified cereals
Vitamin D supplementation can be useful when dietary intake or vitamin D status is inadequate. However, more is not automatically better, and excessive supplemental doses can cause harm.
If you're concerned about low vitamin D, a healthcare professional can help assess your risk factors and determine whether testing or supplementation is appropriate.
2. Omega-3 Fatty Acids
Omega-3 fatty acids are polyunsaturated fats found in foods such as fatty fish, walnuts, flaxseed, and chia seeds. The long-chain omega-3 fatty acids EPA and DHA are found primarily in seafood and marine-based supplements.
EPA and DHA have been studied extensively for cardiovascular health, and prescription-strength omega-3 products can lower elevated triglyceride levels in appropriate clinical settings.
Good food sources include:
- Salmon
- Sardines
- Mackerel
- Trout
- Herring
If you rarely eat fatty fish, a fish-oil or algae-based omega-3 supplement may help increase your EPA and DHA intake.
However, omega-3 supplements should not automatically be viewed as a replacement for eating fish. Seafood provides protein and other nutrients in addition to omega-3 fats.
If you take anticoagulant medication or are considering high-dose omega-3 supplementation, discuss it with an appropriate healthcare professional.
3. Magnesium
Magnesium is involved in hundreds of enzymatic reactions and contributes to normal muscle and nerve function, energy metabolism, blood glucose regulation, and bone health.
Foods rich in magnesium include:
- Leafy green vegetables
- Nuts
- Seeds
- Legumes
- Whole grains
Many adults consume less magnesium from food than recommended. However, having a low dietary intake is not the same as having a clinical magnesium deficiency.
A supplement may be useful when dietary intake is consistently low or when a healthcare professional identifies an increased need.
Supplemental magnesium can cause gastrointestinal side effects such as diarrhea, particularly at higher doses. For adults, the tolerable upper intake level for magnesium from supplements and medications is 350 mg per day unless a healthcare professional recommends otherwise. This limit does not include magnesium naturally present in food.
4. Vitamin B12
Vitamin B12 is essential for healthy nerve function, red blood cell formation, DNA synthesis, and normal cellular metabolism.
People who may be at greater risk of vitamin B12 inadequacy include:
- Vegans
- Some vegetarians
- Older adults
- People with certain gastrointestinal disorders
- People who have undergone some types of gastrointestinal surgery
- People taking certain medications that interfere with B12 absorption
Animal foods naturally contain vitamin B12, while some plant-based foods and beverages are fortified with it.
If low B12 status is contributing to symptoms such as fatigue or anemia, correcting the deficiency can be important. However, taking extra vitamin B12 does not automatically create more energy when your B12 status is already adequate.
5. Probiotics
Probiotics are live microorganisms that can provide a health benefit when consumed in adequate amounts.
One of the most important things to understand about probiotics is that their effects can be strain-specific. A benefit shown for one strain cannot automatically be assumed for every probiotic supplement.
Research has examined specific probiotic strains for concerns such as:
- Antibiotic-associated diarrhea
- Some digestive symptoms
- Certain gastrointestinal conditions
- Other strain-specific health outcomes
Not every supplement labeled as a probiotic has been shown to provide a meaningful health benefit.
When choosing a probiotic, look beyond the total number of colony-forming units. Check whether the label identifies the genus, species, and strain, and look for research supporting that specific strain for the outcome you care about.
Probiotics are generally well tolerated by healthy people, but people who are severely ill or significantly immunocompromised should seek professional guidance before using them.
6. Creatine Monohydrate
Creatine monohydrate is one of the most extensively researched sports nutrition supplements available.
It increases the body's creatine stores, helping support rapid energy production during repeated bouts of high-intensity exercise.
When combined with appropriate training, creatine can support:
- Greater strength gains
- Improved high-intensity exercise performance
- Increased training capacity
- Greater gains in lean mass during resistance training
For most healthy adults using creatine for training, a daily intake of approximately 3–5 grams of creatine monohydrate is a commonly used maintenance dose supported by research.
A loading phase is optional. A commonly studied loading approach uses approximately 20 grams per day, divided into smaller servings, for five to seven days before switching to a maintenance dose. Taking 3–5 grams daily without loading will also increase muscle creatine stores over time.
Creatine is not only being studied in athletes. Researchers are also investigating possible effects on cognition, healthy aging, and other outcomes. Some findings are promising, but the evidence outside creatine's established exercise and performance uses is less consistent.
For healthy adults, creatine monohydrate remains one of the most evidence-supported supplements for resistance training and high-intensity performance.
Do You Need All Six?
Not necessarily.
The best supplement routine is based on your actual needs rather than what's trending online.
Factors that can influence whether a supplement is appropriate include:
- Age
- Diet
- Training goals
- Activity level
- Medical history
- Prescription medications
- Blood test results
- Digestive or absorption problems
- Lifestyle habits
Vitamin D or B12 may be particularly useful when status is low. Magnesium may help when dietary intake is inadequate. Omega-3 supplements may make sense when EPA- and DHA-rich foods are rarely eaten. Probiotics depend heavily on the specific strain and goal.
Creatine is different because its primary use in sports nutrition is not correcting a nutritional deficiency. It's commonly used as an ergogenic aid to support training performance and adaptations.
More supplements do not automatically lead to better results.
For more guidance on deciding whether supplementation is actually necessary, read Stop Buying More Supplements: Why Fixing Deficiencies First Is the Smartest Health Strategy.
How to Choose Quality Supplements
Once you've decided that a supplement serves a useful purpose, product quality matters.
Before purchasing a supplement:
- Choose a reputable manufacturer.
- Read the Supplement Facts label carefully.
- Check the serving size and ingredient amounts.
- Look for reputable independent third-party testing when available.
- Avoid products making unrealistic or guaranteed health claims.
- Be cautious with proprietary blends that don't disclose individual ingredient amounts.
- Check whether you're already getting the same nutrients from other supplements.
Third-party testing does not prove that a supplement is safe or effective, but credible certification can provide useful information about product identity, label accuracy, contaminants, or manufacturing quality, depending on the testing program.
You may also find Are Multivitamins a Waste of Money? What the Science Says useful when comparing targeted supplementation with a general multivitamin.
Common Supplement Mistakes
Choosing the right supplement involves more than selecting the most popular product.
Common mistakes include:
- Taking supplements without a clear reason or goal.
- Assuming that more is always better.
- Replacing healthy eating with supplements.
- Choosing products primarily because of marketing claims.
- Ignoring the Supplement Facts label and serving size.
- Taking several products containing overlapping vitamins and minerals.
- Combining supplements without considering medication interactions.
- Using high doses because a smaller dose didn't produce an immediate effect.
- Assuming a nutrient will improve energy, immunity, or performance simply because it's essential to normal physiology.
- Expecting immediate or dramatic results.
Some vitamins, minerals, herbs, and other supplement ingredients can interact with medications or become harmful at excessive doses.
If you take prescription medication, have a chronic medical condition, are pregnant or breastfeeding, or plan to combine several supplements, discuss the combination with an appropriate healthcare professional.
Healthy Habits Come First
Supplements can play a useful supporting role, but they work best on top of strong nutrition and lifestyle habits.
Prioritize:
- A balanced, nutrient-rich diet
- Adequate protein intake
- Regular resistance training and physical activity
- Quality sleep
- Adequate hydration
- Stress management
- Routine medical care when appropriate
These habits affect muscle growth, recovery, exercise performance, body composition, and long-term health in ways that no single supplement can replace.
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Final Thoughts
Dietary supplements can be useful when they're chosen for a clear reason and supported by appropriate evidence.
Vitamin D, vitamin B12, magnesium, and omega-3 fatty acids may help address specific nutritional needs or dietary gaps. Probiotics can be useful in certain situations, but their effects depend heavily on the strain and intended use. Creatine monohydrate stands out as one of the strongest evidence-based options for improving high-intensity exercise performance and supporting resistance-training adaptations.
That does not mean everyone needs all six.
Start with your diet, training, sleep, recovery, and overall health. Then use supplementation strategically when it fills a genuine need or provides a well-supported performance benefit.
A focused supplement routine built around evidence and individual needs is usually more useful than collecting products simply because they're popular.
Frequently Asked Questions
What are the most effective supplements?
There is no single list that's best for everyone. Effectiveness depends on your goal. Creatine monohydrate has strong evidence for strength and high-intensity performance, while nutrients such as vitamin D or B12 can be particularly useful when intake or status is inadequate.
Should everyone take supplements?
No. Many nutrient needs can be met through food, and supplementation is most useful when it addresses a dietary gap, increased requirement, documented deficiency, or a specific evidence-based goal.
Can I take all six supplements together?
Possibly, but there's rarely a reason to take every supplement simply because it appears on this list. Your diet, health status, goals, medications, and existing supplement intake should determine what's appropriate.
Which supplement is best for energy?
No vitamin or mineral acts like a stimulant simply because it participates in energy metabolism. If fatigue is related to a deficiency such as vitamin B12 or iron deficiency, correcting that deficiency may help. Extra supplementation is unlikely to increase energy when nutrient status is already adequate.
Is creatine only for athletes?
No. Creatine is best established for improving high-intensity exercise performance and resistance-training adaptations, but research is also exploring its potential role in healthy aging and cognitive function.
How much creatine should I take?
A maintenance intake of approximately 3–5 grams of creatine monohydrate per day is commonly used and well supported by research. Loading is optional rather than necessary.
How do I know if I need vitamin D?
Your sun exposure, diet, age, health conditions, and other factors can influence vitamin D status. A healthcare professional can help determine whether testing or supplementation makes sense for you.
Are probiotics worth taking?
They can be useful for some people, but benefits can be strain-specific. Choose a probiotic based on evidence for the specific strain and intended use rather than assuming all probiotic products provide the same effects.
Can supplements replace healthy eating?
No. Supplements can help fill specific gaps, but foods provide protein, fiber, essential nutrients, and many other components that supplements do not fully replace.
How do I choose a quality supplement?
Choose a reputable manufacturer, read the full Supplement Facts label, check serving amounts, avoid exaggerated claims, and look for credible third-party testing when available.
Learn More
For additional evidence-based information about dietary supplements and the ingredients discussed in this article, see:
- National Institutes of Health Office of Dietary Supplements — Dietary Supplements: What You Need to Know
- National Institutes of Health Office of Dietary Supplements — Vitamin D
- National Institutes of Health Office of Dietary Supplements — Omega-3 Fatty Acids
- National Institutes of Health Office of Dietary Supplements — Magnesium
- National Institutes of Health Office of Dietary Supplements — Vitamin B12
- National Institutes of Health Office of Dietary Supplements — Probiotics
- Journal of the International Society of Sports Nutrition — Common Questions and Misconceptions About Creatine Supplementation
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