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How Long Does it Take for Vitamins to Work? It Depends on 5 Factors

Are you wondering why your daily dose of vitamins is not transforming you into a hero yet? Get ready to learn 5 secret factors to get the most out of your supplements!

Jack Martino
How Long Does it Take for Vitamins to Work? It Depends on 5 Factors
Table Of Contents

When it comes to physical and mental health, vitamins play a vital role in the maintenance of both. Vitamins are essential for maintaining energy levels, growth, and healthy functioning.

But how quickly can you expect them to start doing their job? Many people assume that taking a vitamin makes them feel energized or healthier. However, you would be surprised to know that the truth is more nuanced than this.

It varies depending on your body type, current health status, pre-existing conditions, and activity level. Are you, too, looking to boost your health with some daily vitamins but wondering when you'll start feeling like a superhero? We've researched to determine when to expect those nutrients to start working their magic.

And as it turns out, small, consistent doses are the way to go not a massive, one-time gulp of pills. So, brace yourselves. The vitamin waiting game is like a box of chocolates; you never know what you will get.

While some folks notice a positive change in a matter of days, others might have to hold out for a few months. But don't throw in the towel just yet because we're about to reveal five factors determining the speed of vitamin results. Whether a supplement pro or a newbie, buckle up and prepare to maximize your vitamin game.

5 Factors on Which Vitamin Working Depends

Throw away your clocks because there's no one-size-fits-all time frame for feeling the full effects of vitamins. Sure, research suggests correcting a deficiency can take 1-3 months, but that's just the tip of the supplement iceberg.

Your diet, health, and the specific vitamins you're popping can all have a say in how long you start feeling like a new person. Ready to dive in? Let's explore the five factors that can influence your vitamin experience.

1. Your Baseline Vitamin Levels

Let's talk about your baseline vitamin levels, or as I like to call it, your starting point in the vitamin game. Like a runner's training regimen, the time it takes to see the results may vary depending on your shape (or out of shape).

So if you're at the end of vitamin deficiency, be prepared to stick it out a little longer before feeling like a whole new you. However, sometimes a few weeks of supplements can do the trick if you're slightly below average.

2. Your Diet

Is the food you're eating making a difference in how your body absorbs vitamins? Well, it does! Did you know that some vitamins require dietary fat to work? AKA, if you're not incorporating omega-3 fatty acids into your diet, you could be hindering their effectiveness - and who wants that?

On the other hand, vitamins like Vitamin C+ and B are water-soluble and absorbed into your body much more easily. But wait, there's more! If you're following a vegan diet, it might take longer for your body to absorb specific vitamins like B12 and D. To top it off, caffeine has been shown to hinder the absorption of vitamin D and calcium. Who knew vitamins were such a tricky bunch?

3. Oral Vs. Sublingual Vitamins

Taking your daily vitamin is essential, but it's not just about the quantity. How you consume those vitamins could make or break the deal. You might think that gulping down those pills and capsules is good enough, but the truth is, your body might not be getting all of the goods.

When you swallow them, your stomach enzymes break them down before the nutrients hit your liver, which is where your body can use them. According to research, folks who took oral B12 supplements only absorbed a measly 2% of the dosage. It may be time to rethink your vitamin-taking game plan.

Who knew that the secret to better vitamin absorption was hiding right under our noses - our tongues? Taking vitamins sublingually (a fancy way of saying "under the tongue") can lead to faster and more efficient absorption of all those precious nutrients.

According to another study, when you take vitamins this way, they bypass your digestive system and make a beeline for your bloodstream, giving you a more potent dose of all that good stuff.

And if you need any more convincing, a recent study found that patients who used an oral spray to take their vitamin D3 had significantly higher concentrations of the vitamin in their blood than those who opted for suitable old-fashioned capsules. So pucker up; your mouth may be the key to unlocking your body's vitamin potential!

4. Multivitamins Vs. Individual Vitamins

Are multivitamins the superheroes or the jack-of-all-trades of the supplement world? According to the Council for Responsible Nutrition Report 2018, vitamins are the most popular choice among US adults.

But let's be honest; sometimes, you need a superhero to save the day. Individual vitamin supplements might be the way to go if you're trying to address a specific nutrient deficiency. After all, multivitamins contain dozens of nutrients, but they don't always cater to your body's targeted needs.

Today many people experience vitamin D deficiency and that's where a vitamin supplement could swoop in and save the day. So, don't settle for an all-in-one solution if your body needs a specific nutrient boost.

"Most multivitamins just aren't cutting it when it comes to getting enough vitamin D." ~Nutritionist Brittany Michels

She recommends adding a singular vitamin D supplement to your daily routine. So, don't wait for the sun to shine - give your body the vitamin D it needs to thrive!

5. Underlying Health Issues

You know what they say you are what you absorb. But Unfortunately, Not all health issues are created equal, and some can make it challenging for your body to get the necessary vitamins.

You might have trouble absorbing your vitamins efficiently if you're dealing with inflammatory bowel disease or malabsorption disorders like lactose intolerance or Celiac disease.

And if you're carrying around a few extra pounds, your body might need more time to finish the job. But fear not! We're not just here to scare you with all this vitamin absorption talk. We've got some good news.

How Do You Know If Vitamins Are Working?

How do you know if vitamins are working

Vitamins can be pretty sneaky - knowing if they're doing the job is tough. The best way to assess their effectiveness is through a blood test, precisely measuring the concentration of the vitamins in your system.

But wait, there's more! You can also take a personal inventory of how you feel before and after taking them. Are you feeling extra energized after a few weeks of B12? That's a good sign it's doing something.

Remember not to get too caught up in the "if you don't feel it, it's not working" trap. Vitamins aren't magical elixirs - they work hard behind the scenes. So keep taking them, even if you have yet to notice a significant change. Trust us on this one.

Smaller Habits Are Better Than Mega Doses

Smaller Habits are better than mega doses

Why bother with a massive health overhaul when small, simple daily habits can do the trick? It's like trying to lift a boulder with a toothpick when you can pick up a pebble every day.

Trust us those daily pebbles can add up and give you a rock-solid foundation for a healthy lifestyle. Remember to underestimate the power of the little things - they're the key to a happy and healthy life!

Related Article: What is Micronutrient Deficiency


1. How long should you take multivitamins supplements?

The best approach when considering how long to take a particular multivitamin supplement is to consult your healthcare provider or nutritionist for guidance. It is because everyone's nutritional needs may vary based on age, gender, medical history, lifestyle factors, and more.

Depending on these factors, some individuals may benefit from taking multivitamins for shorter periods, such as three months or even two weeks. Others might need prolonged supplementation over several years to get the full health benefits of regular nutrient consumption.

2. Do you feel the difference between taking multivitamins?

Taking multivitamins is integral to a healthy lifestyle and can help you feel better in various ways. Your bodies need vitamins & minerals to function, and when our diets don't provide enough, supplementing with multivitamins can be beneficial.

Most people who take multivitamins report having more energy, improved moods, and better overall well-being due to the added nutrients. Multivitamins benefit anyone who has trouble getting all their nutrients from food alone.

3. How long does it take for vitamin D to work for anxiety?

Regarding treating anxiety, the scientific evidence on how long it takes for Vitamin D to work is still inconclusive.

However, research suggests adequate Vitamin D levels may reduce anxiety symptoms in some people. Generally speaking, it may take 4 to 10 weeks for those supplementing with Vitamin D to begin noticing improvements in their anxiety symptoms. However, this is contingent upon many other variables, such as dosage taken and severity of deficiency before supplementation.

4. How long does it take for vitamin B12 to work?

The effects of vitamin B12 vary due to many factors, including age and general health status. Generally speaking. However, it can take anywhere from several days up to a few months before the beneficial effects of supplementation become noticeable.

Everyone responds differently to the intake of vitamins; some people may notice positive changes in their energy levels or mental clarity as quickly as within 2-3 days after starting supplementation with B12, while others may need at least 8 weeks before any tangible results are seen in terms of improved physical and cognitive performance


Vitamins are like the magic beans of physical and mental health, but you can't just toss them in and expect immediate results. It's like a recipe: how quickly vitamins take effect depends on a few key ingredients. Your body type, conditions, and activity level affect your vitamin experience. Your starting vitamin levels, diet, and intake method can be game-changers.

Sometimes, you need a little extra boost through multivitamins or specific supplements. And watch out for those pesky health issues that can slow down vitamin absorption. You can check your progress with a blood test or personal inventory of changes. Remember, it's not about mega doses but those small, steady habits leading to a healthy lifestyle.

Article Sources

  • Todd, Joshua J., et al. "Vitamin D3 Supplementation in Healthy Adults: A Comparison between Capsule and Oral Spray Solution as a Method of Delivery in a Wintertime, Randomised, Open-Label, Cross-over Study."The British Journal of Nutrition, vol. 116, no. 8, Oct. 2016, pp. 1402-08. PubMed,
  • Faisal, Sobia, and Faryal Sardar Mirza. "SUBLINGUAL VITAMIN D3 EFFECTIVE IN A PATIENT RESISTANT TO CONVENTIONAL VITAMIN D SUPPLEMENTATION." AACE Clinical Case Reports, vol. 6, no. 6, Sept. 2020, pp. e342-45. PubMed Central,
  • Chan, Catherine Qiu Hua, et al. "Oral Vitamin B12 Replacement for the Treatment of Pernicious Anemia." Frontiers in Medicine, vol. 3, Aug. 2016, p. 38. PubMed Central,
  • White, David J., et al. "Effects of Four-Week Supplementation with a Multi-Vitamin/Mineral Preparation on Mood and Blood Biomarkers in Young Adults: A Randomised, Double-Blind, Placebo-Controlled Trial." Nutrients, vol. 7, no. 11, Oct. 2015, pp. 9005-17. PubMed Central,

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Jack Martino

Jack Martino has an extensive knowledge of health and fitness, especially exercises and workouts, and offers readers valuable information combined with captivating stories that keep them engaged and informed.

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