Sunlight vs supplement: Which is the better source of vitamin D?
Vitamin D is essential for strong bones, muscles, immunity, and overall health. A US-based cardiac surgeon explains why supplements may work better than sunlight for many people and why balance is still important.
Vitamin D is often called the “sunshine vitamin,” but many people still struggle with low levels despite living in sunny countries. From bone weakness and muscle pain to fatigue and poor immunity, vitamin D deficiency has become increasingly common worldwide, including in India.
For years, people have believed that spending time in the sun is the best and most natural way to get enough vitamin D. After all, our bodies are designed to produce this important nutrient when the skin is exposed to sunlight. But is sunlight alone really enough in today’s lifestyle?
Or are supplements a more effective option?
According to Dr Jeremy London, a board-certified cardiovascular surgeon with more than 25 years of clinical experience in the United States, the answer may surprise many people. In a recent Instagram video, the doctor explained that while sunlight has many health benefits, vitamin D supplements may actually be a more reliable way to maintain healthy vitamin D levels.
His comments have sparked online discussions because many people assume that natural sunlight should always be superior to supplements.
However, modern research paints a more complicated picture. Factors like skin tone, pollution, sunscreen use, age, lifestyle, and even geography can affect how much vitamin D your body actually produces from sunlight.
WHY VITAMIN D IS IMPORTANT
Vitamin D is a fat-soluble vitamin that helps the body absorb calcium and phosphorus, two minerals essential for healthy bones, teeth, and muscles. Without enough vitamin D, the body cannot properly use calcium, even if your diet contains enough of it.
According to health experts, vitamin D also plays a role in immune function, muscle strength, inflammation control, and overall health. Severe deficiency can lead to conditions such as rickets in children and osteomalacia in adults, which causes bone pain and weakness.
Low vitamin D levels have also been linked to fatigue, low mood, muscle cramps, and poor immunity in some people.
HOW THE BODY GETS VITAMIN D
There are three main ways to get vitamin D:
Sunlight exposure
Food sources
Supplements
When ultraviolet B (UVB) rays from the sun hit the skin, the body produces vitamin D3 naturally. The liver and kidneys then convert it into its active form.
Some foods also contain vitamin D, including:
Fatty fish such as salmon and sardines
Egg yolks
Fortified milk and dairy products
Mushrooms exposed to sunlight
However, getting enough vitamin D through food alone can be difficult for many people, especially vegetarians. This is why supplements are commonly recommended.
SUNLIGHT AND SUPPLEMENTS PRODUCE THE SAME VITAMIN
One of the key points highlighted by Dr Jeremy London is that the vitamin D produced from sunlight and the vitamin D taken through supplements are chemically the same.
“The vitamin D your skin produces from the sun and the vitamin D in a supplement are the same molecule. Your body processes them the same way,” the doctor explained.
This means the real question is not whether one form is more “natural,” but which method works more consistently in raising vitamin D levels in the body.
WHY SUPPLEMENTS MAY WORK BETTER
According to the cardiac surgeon, research shows that oral vitamin D supplements often raise blood levels more reliably than sunlight exposure.
He referred to studies showing that even 20 to 30 minutes of midday sunlight may not always be enough for many people to reach healthy vitamin D levels. In contrast, small daily doses of supplements helped most participants achieve adequate levels within weeks.
The reason is that sunlight exposure is highly unpredictable. Several factors affect how much vitamin D your body can make, including:
- SKIN TONE
People with darker skin have more melanin, which reduces the skin’s ability to produce vitamin D from sunlight. They may need longer sun exposure compared to people with lighter skin.
- TIME OF DAY AND SEASON
UVB rays are strongest during midday. During winter or in areas with high pollution, vitamin D production may decrease significantly.
- SUNSCREEN USE
Sunscreen protects the skin from harmful UV rays but can also reduce vitamin D production.
- AGE
As people age, the skin becomes less efficient at making vitamin D.
CLOTHING AND INDOOR LIFESTYLE
Modern lifestyles keep many people indoors for most of the day. Clothing that covers most of the body also limits sun exposure.
Dr London also pointed out that the body has a natural limit on how much vitamin D it can produce from sunlight in a day.
“The sun is variable. A supplement is precise,” he said.
DOES THIS MEAN SUNLIGHT IS USELESS?
Not at all. Experts continue to recommend safe sun exposure because sunlight offers several benefits beyond vitamin D production. It can improve mood, regulate sleep cycles, and support overall well-being.
Dr London suggested a balanced approach instead of completely replacing sunlight with supplements.
“Spend time in the sun. It supports you in ways a supplement never will. But for vitamin D itself, D3 with K2 is the more dependable strategy,” he explained.
Vitamin K2 is often paired with vitamin D3 because it may help direct calcium into the bones instead of soft tissues, though people should consult a doctor before starting supplements.
SHOULD EVERYONE TAKE VITAMIN D SUPPLEMENTS?
Not necessarily. Health experts advise checking vitamin D levels through a blood test before starting high-dose supplements. Excess vitamin D can also be harmful if taken without medical supervision.
People who may be at higher risk of deficiency include:
Older adults
Pregnant women
People with limited sun exposure
Individuals with darker skin tones
People who spend most of their time indoors
Those with certain digestive or kidney conditions
Doctors may recommend supplements based on individual health needs and deficiency levels.
Sunlight remains an important part of a healthy lifestyle, but it may not always provide enough vitamin D for everyone. According to Dr Jeremy London, supplements offer a more reliable and measurable way to maintain healthy vitamin D levels, especially when modern lifestyles limit sun exposure.
Experts say the best approach is to balance safe sunlight exposure, a nutritious diet, and supplements when medically needed. Before starting any vitamin D supplement, consulting a healthcare professional is always recommended.
Vitamin D is often called the “sunshine vitamin,” but many people still struggle with low levels despite living in sunny countries. From bone weakness and muscle pain to fatigue and poor immunity, vitamin D deficiency has become increasingly common worldwide, including in India.
For years, people have believed that spending time in the sun is the best and most natural way to get enough vitamin D. After all, our bodies are designed to produce this important nutrient when the skin is exposed to sunlight. But is sunlight alone really enough in today’s lifestyle?
Or are supplements a more effective option?
According to Dr Jeremy London, a board-certified cardiovascular surgeon with more than 25 years of clinical experience in the United States, the answer may surprise many people. In a recent Instagram video, the doctor explained that while sunlight has many health benefits, vitamin D supplements may actually be a more reliable way to maintain healthy vitamin D levels.
His comments have sparked online discussions because many people assume that natural sunlight should always be superior to supplements.
However, modern research paints a more complicated picture. Factors like skin tone, pollution, sunscreen use, age, lifestyle, and even geography can affect how much vitamin D your body actually produces from sunlight.
WHY VITAMIN D IS IMPORTANT
Vitamin D is a fat-soluble vitamin that helps the body absorb calcium and phosphorus, two minerals essential for healthy bones, teeth, and muscles. Without enough vitamin D, the body cannot properly use calcium, even if your diet contains enough of it.
According to health experts, vitamin D also plays a role in immune function, muscle strength, inflammation control, and overall health. Severe deficiency can lead to conditions such as rickets in children and osteomalacia in adults, which causes bone pain and weakness.
Low vitamin D levels have also been linked to fatigue, low mood, muscle cramps, and poor immunity in some people.
HOW THE BODY GETS VITAMIN D
There are three main ways to get vitamin D:
Sunlight exposure
Food sources
Supplements
When ultraviolet B (UVB) rays from the sun hit the skin, the body produces vitamin D3 naturally. The liver and kidneys then convert it into its active form.
Some foods also contain vitamin D, including:
Fatty fish such as salmon and sardines
Egg yolks
Fortified milk and dairy products
Mushrooms exposed to sunlight
However, getting enough vitamin D through food alone can be difficult for many people, especially vegetarians. This is why supplements are commonly recommended.
SUNLIGHT AND SUPPLEMENTS PRODUCE THE SAME VITAMIN
One of the key points highlighted by Dr Jeremy London is that the vitamin D produced from sunlight and the vitamin D taken through supplements are chemically the same.
“The vitamin D your skin produces from the sun and the vitamin D in a supplement are the same molecule. Your body processes them the same way,” the doctor explained.
This means the real question is not whether one form is more “natural,” but which method works more consistently in raising vitamin D levels in the body.
WHY SUPPLEMENTS MAY WORK BETTER
According to the cardiac surgeon, research shows that oral vitamin D supplements often raise blood levels more reliably than sunlight exposure.
He referred to studies showing that even 20 to 30 minutes of midday sunlight may not always be enough for many people to reach healthy vitamin D levels. In contrast, small daily doses of supplements helped most participants achieve adequate levels within weeks.
The reason is that sunlight exposure is highly unpredictable. Several factors affect how much vitamin D your body can make, including:
- SKIN TONE
People with darker skin have more melanin, which reduces the skin’s ability to produce vitamin D from sunlight. They may need longer sun exposure compared to people with lighter skin.
- TIME OF DAY AND SEASON
UVB rays are strongest during midday. During winter or in areas with high pollution, vitamin D production may decrease significantly.
- SUNSCREEN USE
Sunscreen protects the skin from harmful UV rays but can also reduce vitamin D production.
- AGE
As people age, the skin becomes less efficient at making vitamin D.
CLOTHING AND INDOOR LIFESTYLE
Modern lifestyles keep many people indoors for most of the day. Clothing that covers most of the body also limits sun exposure.
Dr London also pointed out that the body has a natural limit on how much vitamin D it can produce from sunlight in a day.
“The sun is variable. A supplement is precise,” he said.
DOES THIS MEAN SUNLIGHT IS USELESS?
Not at all. Experts continue to recommend safe sun exposure because sunlight offers several benefits beyond vitamin D production. It can improve mood, regulate sleep cycles, and support overall well-being.
Dr London suggested a balanced approach instead of completely replacing sunlight with supplements.
“Spend time in the sun. It supports you in ways a supplement never will. But for vitamin D itself, D3 with K2 is the more dependable strategy,” he explained.
Vitamin K2 is often paired with vitamin D3 because it may help direct calcium into the bones instead of soft tissues, though people should consult a doctor before starting supplements.
SHOULD EVERYONE TAKE VITAMIN D SUPPLEMENTS?
Not necessarily. Health experts advise checking vitamin D levels through a blood test before starting high-dose supplements. Excess vitamin D can also be harmful if taken without medical supervision.
People who may be at higher risk of deficiency include:
Older adults
Pregnant women
People with limited sun exposure
Individuals with darker skin tones
People who spend most of their time indoors
Those with certain digestive or kidney conditions
Doctors may recommend supplements based on individual health needs and deficiency levels.
Sunlight remains an important part of a healthy lifestyle, but it may not always provide enough vitamin D for everyone. According to Dr Jeremy London, supplements offer a more reliable and measurable way to maintain healthy vitamin D levels, especially when modern lifestyles limit sun exposure.
Experts say the best approach is to balance safe sunlight exposure, a nutritious diet, and supplements when medically needed. Before starting any vitamin D supplement, consulting a healthcare professional is always recommended.
