The 7 Best Supplements for Energy: Science-Backed Options

Why You Might Need Energy Supplements

Feeling tired and low on energy is one of the most common health complaints. While the foundation of good energy levels starts with adequate sleep, a balanced diet, regular exercise, and stress management, certain supplements can provide additional support when lifestyle factors alone are not enough.

It is important to note that persistent fatigue can be a sign of underlying health conditions such as thyroid disorders, anemia, or vitamin deficiencies. Always consult a healthcare professional if fatigue is severe or ongoing.

1. Vitamin B12

Why it works: Vitamin B12 is essential for energy production at the cellular level. It helps your body convert food into glucose, which your cells use for energy. It also plays a key role in red blood cell formation — without enough B12, your body cannot effectively transport oxygen to your tissues.

Who needs it most:

• Vegetarians and vegans (B12 is primarily found in animal products)
• Adults over 50 (absorption decreases with age)
• People taking metformin or acid-reducing medications

Recommended dose: 2.4 mcg per day (RDA), though many supplements provide 500-1,000 mcg for those with deficiency.

Best form: Methylcobalamin is generally preferred over cyanocobalamin as it is the naturally occurring form and does not require conversion by your body.

2. Iron

Why it works: Iron is a core component of hemoglobin, the protein in red blood cells that carries oxygen throughout your body. When iron levels are low, your muscles and tissues do not get enough oxygen, leading to fatigue, weakness, and reduced stamina.

Who needs it most:

• Women with heavy menstrual periods
• Pregnant women
• Vegetarians and vegans
• Endurance athletes

Recommended dose: 18 mg for women (19-50), 8 mg for men and postmenopausal women. Only supplement if blood tests confirm deficiency.

Important tip: Take iron with Vitamin C to boost absorption by up to 67%. Avoid taking with calcium, coffee, or tea.

3. Coenzyme Q10 (CoQ10)

Why it works: CoQ10 is a powerful antioxidant that plays a fundamental role in cellular energy production. It is found in the mitochondria of every cell and is directly involved in creating ATP — your body's primary energy currency.

Who needs it most:

• Adults over 40 (natural CoQ10 production declines with age)
• People taking statin medications (statins deplete CoQ10)
• Those with heart conditions

Recommended dose: 100-200 mg per day

Best form: Ubiquinol is the active form and is better absorbed than ubiquinone, especially for those over 40.

4. Magnesium

Why it works: Magnesium is involved in over 300 enzymatic reactions in your body, including energy metabolism. It helps convert food into energy, supports muscle and nerve function, and is needed for the activation of ATP. Despite its importance, an estimated 50% of the U.S. population does not get enough magnesium from diet alone.

Who needs it most:

• Most adults (widespread deficiency)
• Athletes and active individuals
• People under chronic stress
• Those with digestive conditions

Recommended dose: 310-420 mg per day depending on age and sex

Best forms: Magnesium glycinate (well-absorbed, gentle on stomach), magnesium citrate (good absorption), or magnesium threonate (crosses the blood-brain barrier).

5. Vitamin D

Why it works: As discussed in our comprehensive Vitamin D guide, this vitamin is essential for overall health including energy levels. Research has shown that Vitamin D deficiency is strongly associated with fatigue. A study published in the North American Journal of Medical Sciences found that correcting Vitamin D deficiency significantly improved energy levels and reduced fatigue.

Who needs it most:

• People living in northern latitudes
• Those with limited sun exposure
• People with darker skin tones
• The elderly

Recommended dose: 1,000-2,000 IU daily for most adults (higher if deficient)

Best form: Vitamin D3 (cholecalciferol), taken with a meal containing fat.

6. Ashwagandha

Why it works: Ashwagandha is an adaptogenic herb used in traditional Ayurvedic medicine for centuries. Modern research supports its ability to reduce cortisol levels, combat stress-related fatigue, and improve physical endurance. A 2012 study in the Indian Journal of Psychological Medicine found that ashwagandha root extract significantly reduced stress and improved quality of life.

Who needs it most:

• People dealing with chronic stress
• Those experiencing adrenal fatigue
• Athletes seeking improved endurance
• Anyone with stress-related sleep issues

Recommended dose: 300-600 mg of root extract per day (standardized to 5% withanolides)

Best form: KSM-66 or Sensoril are well-researched, standardized extracts.

7. Creatine

Why it works: While best known for athletic performance, creatine plays a fundamental role in energy production. It helps regenerate ATP during high-intensity activities and has been shown to reduce mental fatigue and improve cognitive performance, especially under stress or sleep deprivation.

Who needs it most:

• Athletes and active individuals
• Vegetarians and vegans (dietary creatine comes primarily from meat)
• Those seeking both physical and mental energy support

Recommended dose: 3-5 g per day of creatine monohydrate

Important note: Creatine monohydrate is the most studied and effective form. Newer "advanced" forms generally do not offer additional benefits despite higher prices.

Creating Your Energy Supplement Stack

When combining energy supplements, consider timing and interactions:

Morning (with breakfast):

• Vitamin B12
• Iron (if needed) + Vitamin C
• CoQ10
• Vitamin D (with fat)

Afternoon:

• Magnesium (if not taking at night)
• Creatine

Evening:

• Ashwagandha (can promote relaxation)
• Magnesium (glycinate form supports sleep)

How Supplement Scanner Can Help

Not sure which energy supplements are right for you? Use Supplement Scanner to:

• Scan any energy supplement and instantly see its quality score
• Check your current stack for interactions and redundancies
• Set your energy goal in the app to receive personalized recommendations
• Track your daily intake to ensure consistency
• Compare products to find the best value and quality

Important Reminders

• Supplements work best alongside healthy lifestyle habits
• Always address root causes of fatigue with a healthcare provider
• Start with one new supplement at a time to monitor effects
• Quality matters — look for third-party tested products
• More is not always better — follow recommended doses

Energy supplements can be a valuable addition to your wellness routine when used correctly. By understanding what each supplement does and who benefits most, you can make informed decisions that truly support your energy levels.