Vitamin D and Mental Health: What Every Filipino Should Know

It’s natural to feel worried or down during difficult times—work challenges, family problems, financial difficulties, losing someone you love, or facing a big life change. But what if everything in your life seems fine, yet you still wake up feeling low, heavy, or overwhelmed for no clear reason? That kind of unexplained emotional weight can feel both confusing and isolating.

You might even catch yourself wondering, “Why do I feel this way when nothing seems to be wrong?” It’s frustrating when you can’t pinpoint the cause, and even more so when others can’t understand it either. This feeling is often made worse by the stigma around mental health in the Philippines, where it’s still considered taboo and rarely talked about. Because of this, many people choose to stay silent rather than seek help, making the struggle feel heavier. But just like physical health, mental well-being deserves care and attention. Taking care of your mind should be as natural and essential as caring for your body.

Sometimes, the answer isn’t in your circumstances at all. Sometimes, it’s something physical. It is something happening inside your body.

One possible culprit? Low vitamin D levels—something you might not even notice. Curious how this single vitamin could impact your mood and mental well-being? Read on.
 

What Is Vitamin D and Why Is It So Important?

Vitamin D is a fat-soluble vitamin your body naturally produces when your skin is exposed to sunlight.¹ Sadly, even in a sunny country like the Philippines, it’s still easy to fall short on sun exposure. Busy work schedules, working from home, long commutes, and weekends spent indoors can all limit your time in the sun. That’s why getting enough vitamin D from foods or supplements can be so important.

While it’s best known for helping your body absorb calcium and maintain strong bones, vitamin D also plays a vital role in keeping your brain healthy.² Vitamin D receptors are found throughout the brain, including areas that regulate mood, like the hippocampus.³ It helps manage brain chemicals that affect mood, keeps your energy levels steady, and supports overall mental well-being. Getting enough vitamin D may even help ease those unexplained feelings of being “low” or “overwhelmed.”⁴
 

The Link Between Vitamin D and Mental Health

There’s a growing body of evidence suggesting that vitamin D plays a vital role in mental and emotional wellness. Here’s how:

1. Regulates Key Hormone for Mood and Sleep

   Vitamin D may help the brain produce serotonin, commonly known as the happy hormone, a chemical that supports mood, thinking, self-control, and social behavior. A preliminary lab-based study suggested that the active form of vitamin D may play a role in serotonin production by activating TPH2, an enzyme involved in serotonin synthesis, within 24 hours in certain neuronal cell populations in the rat brain.² However, this finding is based on animal and cell studies, so more research in humans is needed to fully understand the extent of this effect.²

   Interestingly, vitamin D may also play a role in regulating melatonin, the hormone that helps you sleep.² In the evening, when vitamin D levels naturally drop, the body may increase serotonin production in the pineal gland. This serotonin is then turned into melatonin to help prepare the body for sleep.

2. May Help Prevent Mental Health Issues

   Vitamin D treatment may benefit individuals experiencing depression, seasonal affective disorder (SAD), schizophrenia, and other mood-related conditions.^5,6 For example, a 2010 study on SAD showed that an hour of morning light therapy significantly improved symptoms. Interestingly, participants who received a single high dose of vitamin D experienced even greater mood improvements than those undergoing light therapy.⁵

   The study also hinted at a possible link between giving infants vitamin D supplements and a lower chance of developing schizophrenia later in life, especially among boys.⁵ However, this is just an early finding and should be taken with caution, as many other factors also influence schizophrenia risk. Research on older adults has also found that low vitamin D levels may be tied to a higher likelihood of experiencing depression symptoms, though it doesn’t appear to be connected to Alzheimer’s.⁵

   The connection between vitamin D and mood is complex. Moreover, researchers are continuing to explore it. Still, these early studies offer hope that something as simple as maintaining adequate vitamin D could be helpful in nurturing mental wellness.

3. Helps Nourish and Protect Brain Cells

   Vitamin D helps nerve cells grow and heal while boosting key proteins that keep the brain healthy:⁷

   • Nerve Growth Factor (NGF): Helps brain cells grow and survive.
   • Glial Cell Line-Derived Neurotrophic Factor (GDNF): Supports brain cells that control movement and mood.
   • Brain-Derived Neurotrophic Factor (BDNF): Boosts learning, memory, and overall brain function.

Are You Getting Enough Vitamin D?

Despite its importance, vitamin D deficiency is surprisingly common, especially among people who:⁸

• Spend most of their time indoors, such as those who work from home, factory workers, and night shift employees
• Have darker skin (which naturally blocks UV absorption)
• Are older adults
• Wear sunscreen regularly
• Have obesity

Symptoms of low vitamin D can include:⁸

• Fatigue or low energy
• Mood swings
• Brittle bones
• Increased anxiety
• Muscle weakness
• Joint problems
• Weakened immune response

If you’re experiencing any of these symptoms regularly, it might be time to look into your vitamin D levels. It’s also important to remember that these symptoms can also be related to other health conditions, so consulting a doctor for a proper diagnosis is essential.
 

How Much Vitamin D Do You Need?

The Recommended Daily Intake (RDI) of vitamin D for Filipinos, according to the Food and Nutrition Research Institute (FNRI) Dietary Reference Intakes (PDRI), is generally 5 mcg (200 IU) for infants, children, and adults up to 49 years old. This amount increases to 10 mcg (400 IU) for adults aged 50–59 and 15 mcg (600 IU) for those 60 and above. However, due to the prevalence of vitamin D deficiency, especially with indoor lifestyles, Filipinos may need more vitamin D, and exposure to sunlight is the most practical source.⁹

The most accurate way to know how much vitamin D you need is through a 25-hydroxy vitamin D blood test. Your healthcare provider can then guide you on the right dosage and the best form of supplementation for you.
 

Ways to Boost Vitamin D Levels Naturally

1. Sunlight¹⁰

   Sensible sun exposure can help the body produce sufficient amounts of vitamin D.¹⁰ Specifically, exposing the arms and legs to sunlight for about 5 to 15 minutes, 2 to 3 times per week, between 10:00 AM and 3:00 PM, can significantly contribute to maintaining healthy vitamin D levels. However, the effectiveness of sun exposure varies and depends on several factors, such as skin tone, geographic location, season, and time of day.
    

2. Food Sources

   Though few foods contain high amounts of vitamin D, some good sources include:

   • Mushrooms
   • Fatty fish (salmon, mackerel, sardines)
   • Egg yolks
   • Fortified milk or plant-based alternatives
   • Beef liver
      
3. Supplements

   If you struggle to get enough from sunlight or food (as many people do), a supplement may be the most reliable way to maintain optimal levels. Look for vitamin D3 (cholecalciferol), which is more effective than D2 for raising and maintaining vitamin D levels.

   Consider Cholecalciferol (Pharex^® D-Vit 800). It contains 800 IU of vitamin D3. In general, vitamin D is known to help:¹¹

   • Absorb and maintain calcium and phosphorus in the body
   • Build and strengthen bones
   • Counteract inflammation
   • Promote cell growth, glucose metabolism, and ideal neuromuscular and immune function¹²
   • Prevent accelerated aging in adults¹³

Nourish your body and boost your well-being with the vitamins it deserves. A daily dose of Cholecalciferol (Pharex^® D-Vit 800), combined with proper diet and regular exercise, can help you receive adequate amounts of this vitamin.¹⁴

Cholecalciferol (Pharex^® D-Vit 800) is available in leading drugstores nationwide and online via Lazada or Shopee at a suggested retail price (SRP) of Php 6.50 per capsule.

A Small Step With a Big Impact

Mental health is multifaceted, and while no single vitamin can cure depression or eliminate anxiety, vitamin D is a helpful piece of the puzzle.

Remember: Mental health deserves just as much attention as physical health. And sometimes, the path to a clearer mind starts with something as simple as a little more sunshine.

If symptoms persist, consult a doctor.