Does vitamin D3 K2 give you energy?

You may ask if vitamin D3 K2 gives you energy. Many adults in the U.S. say they feel tired. Almost 42% do not have enough vitamin D. Not having enough can make you feel tired. Studies show vitamin D3 and K2 help you focus. They also help your body fight tiredness. Research shows low levels of these vitamins can cause memory loss. Low levels can also cause inflammation.

A study in 2019 found older adults with low vitamin D felt more tired.
Taking these vitamins may help you feel more awake, especially in winter.

Key Takeaways

Vitamin D3 and K2 can help you feel less tired. They may help you focus better, especially in winter. These vitamins help your body make energy. They help your body use oxygen and sugar well. If you do not have enough vitamin D3 and K2, you may feel tired. You might also forget things more often. Checking your vitamin levels can show if you need more. Taking vitamin D3 and K2 can make your bones stronger. They also help your heart stay healthy. These vitamins are good for your health. Always talk to your doctor before taking new supplements. This is important if you have health problems or take medicine.

How vitamin d3 k2 works

Benefits of vitamin d3

Vitamin d3 is very important for your body. It helps you take in calcium, which keeps bones strong. Vitamin d3 also helps your immune system fight germs. It helps your nerves send messages. Healthy nerves help you move and think. Studies say vitamin d3 helps your body use energy better. If you have enough vitamin d3, your body burns more calories when resting. This can help you feel less tired during the day. In your muscles, vitamin d3 helps mitochondria work harder. Mitochondria are tiny power plants in your cells. They make ATP, which is your body’s main fuel. More ATP can help you focus and feel less tired.

Health Benefit	Evidence Summary
Cancer Mortality	Taking vitamin d3 lowered cancer deaths by about 12% to 13%.
Cardiovascular Health	Higher vitamin d3 levels mean lower risk of heart disease and death.
Depression	Not enough vitamin d3 is linked to more depression.

Benefits of vitamin k2

Vitamin k2 helps your body in many ways. It keeps your blood moving well and makes bones strong. Vitamin k2 also protects your heart. It stops calcium from building up in your arteries. This lowers your chance of heart disease. Some doctors use vitamin k2 to help weak bones. It turns on proteins that help bones use calcium. This makes bones less likely to break.

Health Benefit	Evidence
Heart Health	Vitamin k2 stops calcium from building up in arteries, lowering heart disease risk.
Bone Health	Not enough vitamin k2 means more broken bones; vitamin k2 helps bones use calcium.
Blood Clotting	Vitamin k2 keeps blood thick enough to clot when needed.
Osteoporosis Treatment	MK-4 form of vitamin k2 is used in Asia to treat weak bones.
Cardiovascular Health	Taking vitamin k2 every day lowers heart disease risk over 9 years.

Vitamin k2 can keep your cells safe from harm. It helps mitochondria work better by lowering stress in your cells. Mitochondria make the energy your body needs. Vitamin k2 keeps these power plants healthy, so your cells make enough ATP. This helps your nerves and brain work well and keeps them safe.

Energy production

Your body needs both vitamin d3 and vitamin k2 to make energy. Vitamin d3 helps your muscles use oxygen and burn fuel. It also helps your cells make more ATP, which gives you energy to move and think. Vitamin k2 keeps your mitochondria healthy, so they keep making energy. Both vitamins help your body use sugar better. When your cells use sugar well, you feel less tired and have more energy.

Vitamin d3 helps your cells use insulin, so they turn sugar into energy.
Vitamin k2 also helps your cells use sugar, which keeps your blood sugar steady.
Both vitamins help your cells work better to make energy.

If you get enough vitamin d3 and vitamin k2, you may notice better focus, less tiredness, and more energy for daily life.

Research on vitamin d3 k2 and energy

Studies on fatigue and focus

You might ask if vitamin d3 k2 helps you feel less tired and more focused. Scientists have looked at this in people who feel tired for a long time, like those with long COVID. In one study, 151 people with long COVID took vitamin d3 and vitamin k2 every day for 24 weeks. The group taking the vitamins felt less tired after six months. They also had fewer symptoms. The group not taking vitamins did not get better.

Findings	Description
Study Focus	Studied how vitamins K2 and D3 affect long COVID symptoms, like tiredness and focus.
Participants	151 people had at least two long COVID symptoms for over three months.
Treatment	Took 240 µg K2 and 2000 IU D3 daily for 24 weeks.
Results	The vitamin group had fewer symptoms and felt less tired at month 6.
Comparison	The group without vitamins had more symptoms and felt more tired.
Conclusion	Vitamin d3 k2 is safe and may help you feel less tired and more focused.

Other studies tested vitamin d3 in healthy adults. In one study, adults took either a high or low dose of vitamin d3 for 18 weeks. The group with the higher dose did better on memory and thinking tests. This was most true for people who started with low vitamin d3.

Scientists used tests to check thinking skills.
People who took more vitamin d3 did better on memory tests.
The biggest improvements were in those with low vitamin d3 at first.

Deficiency and energy levels

Many people do not get enough vitamin d3. This can make you feel tired for a long time. Chronic fatigue syndrome affects about 0.2% to 1% of people. Doctors found that people who feel tired often are usually low in vitamin d3. Over a billion people worldwide do not get enough vitamin d3. This is a big health problem.

When you fix a vitamin d3 deficiency, you may feel more energy and less tired. In one study, people with low vitamin d3 took supplements. After treatment, 72% felt less tired. Only 50% in the group without vitamin d3 felt better. The group taking vitamin d3 had a bigger drop in tiredness scores.

Measure	Vitamin D Group	Placebo Group	P-value
Mean FAS Change	-3.3 ± 5.3	-0.8 ± 5.3	0.01
Fatigue Improvement Rate	72% (42)	50% (31)	0.01
Correlation with 25(OH)D Level	R = -0.22	N/A	0.02

If you feel tired a lot, checking your vitamin d3 levels might help you find out why.

Cognitive effects

Vitamin d3 k2 does more than help with tiredness. These vitamins also help your brain. Studies in animals and people show vitamin k2 can protect your memory and thinking. In one study, older rats got MK-7, a type of vitamin k2. They had better memory and less swelling in their brains. In older people, eating more vitamin k2 was linked to less memory loss. People with more vitamin k2 in their brains had a lower chance of dementia.

Evidence Type	Findings	Source
Animal Study	MK-7 helped old rats remember better and lowered swelling.	Elkattawy et al., 2022
Meta-Analysis	More vitamin k meant less memory loss in older people.	Chouet et al., 2015; Presse et al., 2008
Human Study	More brain MK-4 meant lower risk of dementia.	Booth et al., 2022

Some studies show people with higher vitamin k2 do better on thinking tests. Animals without enough vitamin k2 have more trouble learning and remembering.

Vitamin d3 and vitamin k2 help protect your brain cells.
Both vitamins fight damage in your brain.
Low levels of these vitamins are linked to memory loss and brain problems.

If you want to keep your mind sharp and your energy steady, getting enough vitamin d3 k2 may help.

When to use vitamin d3 k2

Signs you may need supplements

You might ask if you should take vitamin d3 k2. Your body can show signs when it needs more of these vitamins. Look for these common signs:

Feeling tired a lot
Pain in your bones
Weak or sore muscles, or muscle cramps
Changes in mood, like feeling sad

If you have these symptoms, you might not have enough vitamin d3 or vitamin k2. Some people feel more tired in winter or after staying inside for a long time. You can ask your doctor for a blood test to check your vitamin levels.

Who benefits most

Some people get more help from vitamin d3 k2 supplements. If your bones are weak or you want a healthy heart, these vitamins can help. Women after menopause often need extra help for their bones. People with heart problems or those who want better calcium use may also benefit.

Study Focus	Population	Key Findings
Combined vitamin K2 and D3 therapy	78 osteoporotic patients	Higher fusion rate (91.18% vs. 71.43%) in VK2 + VD3 group compared to vitamin d3 and calcium.

You may also get help from these vitamins if you have certain health problems:

Health Condition	Benefit
Inflammation Control	Helps lower swelling and supports your immune system.
Lower Back Pain	Lessens pain linked to low vitamin d3.
Athletic Performance	Helps your muscles work and recover better.
Quality Sleep	Supports better sleep.
Blood Sugar Regulation	Helps control blood sugar and lowers diabetes risk.

Safe use tips

You should always use vitamin d3 k2 in a safe way. Most people need 400 to 800 IU of vitamin d3 each day. Some people may need more if they do not have enough. Some doctors say up to 5,000 IU per day for a short time if your levels are very low. For keeping your levels steady, 2,000 IU per day is common.

Source	Recommended Dosage
NIH	400–800 IU vitamin d3 daily
Singh et al.	5,000 IU/day (deficiency); 2,000 IU/day (maintenance)

Tip: Always talk to your doctor before starting any new supplement, especially if you take other medicines or have health problems.

Some people need to be extra careful. If you take blood thinners, vitamin k2 may not be safe unless your doctor says it is okay. High doses of vitamin d3 can make you feel sick, confused, or cause heart problems. Pregnant or breastfeeding women and people with health problems should ask a doctor first.

Other benefits

Bone health

Strong bones help you stay active and healthy. Vitamin D3 and K2 work together for bone health. These nutrients help your body use calcium the right way. Calcium should go into your bones, not your arteries. Research shows vitamin K2 can make your spine bones stronger. Using K2 with other treatments can help even more. Vitamin D3 helps older adults keep bones healthy. It also lowers the chance of broken bones.

Study Type	Findings	Conclusion
Meta-analysis of 16 RCTs	K2 made spine bones stronger in 10 studies.	K2 helps bones when used with other treatments.
RCT of postmenopausal women	K2 MK-4 made spine bones stronger with medicine.	K2 can help bones with medications.
Meta-analysis on vitamin D3	D3 makes bones stronger and lowers fracture risk in older people.	D3 is important to stop weak bones.

Tip: You can keep your bones healthy by getting enough vitamin D3 and K2, especially as you get older.

Heart support

Your heart needs help to avoid calcium buildup. Vitamin K2 moves calcium out of your arteries and into your bones. This keeps your blood vessels flexible and lowers heart disease risk. Taking vitamin D3 with K2 may help your body use calcium better. Some studies show this mix can make arteries less stiff and help your heart. Scientists are still learning how these vitamins affect heart disease.

Vitamin K2 moves calcium away from arteries.
Vitamin D3 and K2 together may make arteries less stiff.
Both vitamins may help your heart more than D3 alone.

Immune system

You need your immune system to fight germs and stay healthy. Vitamin D3 helps immune cells work better and take in calcium. Vitamin K2 turns on proteins that move extra calcium into bones and keep blood flowing. These vitamins help your body fight sickness and lower swelling. Studies show vitamin D3 can raise good signals and lower bad ones. Vitamin K2 may help control swelling and protect your lungs.

Evidence Type	Findings
Vitamin K and Inflammation	More K means less swelling.
Vitamin D3 and Immune Function	D3 is needed for immune and cell health.
Vitamin K's Role	K2 may protect lungs and help immunity.

You can help your immune system and lower swelling by getting enough vitamin D3 and K2.

You might feel more energy and focus with enough vitamin d3 k2. Studies say these vitamins help your bones, heart, and immune system. If you use them often, you may get stronger bones and a healthier heart. Your body can also fight sickness better.

Some people think vitamin d3 k2 only helps bones. But research shows they work together for even more benefits.

Benefit	Description
Bone Health	Bones get stronger and break less often
Cardiovascular Health	Less calcium in arteries and better blood flow
Immune Function	Your body fights sickness more easily

It is important to ask your doctor before you start any new supplement.

FAQ

Can vitamin D3 K2 replace my daily energy drink?

You cannot use vitamin D3 K2 as a quick energy boost like an energy drink. These vitamins help your body work better over time. You may feel less tired if you fix a deficiency, but you will not get instant energy.

How long does it take to feel more energy after starting vitamin D3 K2?

You may notice changes in a few weeks if you were low in these vitamins. Some people feel better in two to four weeks. Your results may vary. Always check your levels with your doctor.

Is it safe to take vitamin D3 K2 every day?

Most people can take vitamin D3 K2 daily at recommended doses. You should not take high doses without a doctor’s advice. Too much can cause health problems. Always follow the label or your doctor’s instructions.

Who should not take vitamin D3 K2 supplements?

You should avoid these supplements if you take blood thinners or have certain health conditions. Pregnant or breastfeeding women should ask a doctor first. Always talk to your healthcare provider before starting any new supplement.

Can I get enough vitamin D3 and K2 from food?

You can get some vitamin D3 from fatty fish and eggs. You find vitamin K2 in fermented foods and some cheeses. Many people do not get enough from food alone. Sunlight helps your body make vitamin D3.