One A Day Men's Multivitamin Review (2024)

Benedict Ang, CPT, PN1-NC
Published by Benedict Ang, CPT, PN1-NC | Staff Writer & Senior Coach
Last updated: December 14, 2023
We personally test every product featured in our reviews and guides. By ordering products anonymously and getting a group of independent testers, we are able to get first-hand experience and provide data-driven recommendations. Learn more.

As a personal trainer for over a decade, I've noticed that no matter how well you plan a healthy diet, you'll likely miss out on certain micronutrients. And running low on vitamins and minerals can become a hurdle to progress.

This is where supplements like One A Day Men's Multivitamin claim to help.

In my experience with various supplements, the issue is that many of them don’t provide all the necessary nutrients in the right quality and dosage.

So, we had seven clients and a nutritionist help us research and test this product over an eight-week period to see if it lives up to our standards.

What Is One A Day Men’s Multivitamin?

Close up shot of One A Day Multivitamins

One A Day is a dietary supplement designed and formulated to provide daily essential vitamins and minerals for men.

It’s a tablet that provides most vitamins and minerals close to their daily required dose or higher.

The aim of the supplement is to provide men with overall health benefits, including immunity and balanced hormone levels.

After digging into the product's history, I found that the formula has changed quite a bit since it was first introduced.

First, some of the ingredients in the supplement now come in a higher dose. But dosages for magnesium, zinc, and manganese have been lowered.

The company has also slightly increased the vitamin K content, but it’s still not the full daily dose.

Our Rating

CTA of One A Day Men's Multivitamin

One A Day Men’s Multivitamin

Overall Score 4.2


Here are the most critical ingredients for male athletes found in One A Day, along with some information from my nutritionist:

  • Vitamin C: Most people simply think of this as an important vitamin for immunity health, but it’s just as important as an antioxidant, according to Mayo Clinic [1].
  • Vitamin D: According to an article from The Guardian, this sunshine vitamin is developed in the skin, and winter months can lead to deficiency [2].
  • Vitamin B Complex: B vitamins play a role in everything from creating red blood cells to nutrient absorption and brain health [3].
  • Vitamin K: Getting enough vitamin K can have a significant effect on your bone density and heart health [4].
  • Magnesium: This mineral plays a role in muscle function and relaxation that is particularly important for athletes [5].
  • Zinc: Male athletes who want to boost their ability to increase testosterone should ensure they get enough zinc on a daily basis [6].

“Studies show that the more active you are, the more magnesium you need. Scientists have linked a high level of magnesium in blood to improved muscle performance, such as greater leg strength.”

- Julia Denner, Nutritionist 


A person flexing his muscles from the benefits of one a day multivitamins

The first thing I would say is that this supplement contains a great range of vitamins and minerals, and most of them are included in the daily recommended intake.

You only need to take one tablet a day.

However, my nutritionist did highlight that the dose of both magnesium and vitamin K is less than half the daily need.

Part of our testing also involved having seven clients take a blood test at the start and then again after eight weeks of taking One A Day Men's Multivitamin.

Known Side Effects

During our testing phase, we asked our clients to also report on any side effects.

None of them reported any major issues, and looking online, we also found no reports from other users in their reviews.

However, if you have allergies to any of the ingredients in One A Day Men's Multivitamins, I highly recommend speaking to your physician before taking the supplement.

  • Great range of vitamins, including A, C, D, E, and B complex
  • Only require taking one tablet a day that is easy to swallow
  • Good selection of trace minerals, including zinc for testosterone
  • Available in a large bottle to keep you going for more than six months
  • The formula is a bit light on magnesium for athletes
  • Doesn’t provide a full daily dose of vitamin K
  • Blood tests didn’t show a significant boost in nutrient uptake

Who Should Take One A Day Men’s Multivitamin?

Men struggling with minor deficiencies in certain vitamins and minerals should consider taking One A Day Men's Multivitamin.

Our test results show that it has a modest effect on blood serum levels of the micronutrients included.

Who Shouldn't Take One A Day Men’s Multivitamin?

Men who have significant deficiencies or who are looking for a full dose of magnesium and vitamin K shouldn’t take One A Day men’s Multivitamin.

Our testing has shown that it doesn’t boost levels as much as other supplements.

Where Can You Buy It?

A person buying One a Day multivitamins online

You can buy One A Day Men’s Multivitamin at Amazon, and if you’re a Prime member, then shipping should only take two days.

Just be careful to only buy directly from Amazon and avoid some of the resellers where you might not get the real supplement.

One thing I would highlight is that it’s regularly out of stock.

So if you’re starting to run low, I would suggest ordering well in advance of running out.

Our Rating

CTA of One A Day Men's Multivitamin

One A Day Men’s Multivitamin

Overall Score 4.2

Other User Reviews

Here are some online reviews we found interesting, as they seem to confirm some of our findings.

After taking it for about a month, he found that he had more energy for physical and mental work, and he loved the convenience of just taking one tablet a day.

- Anthony from Boston

He found that after taking it for over a month that there wasn’t any marked difference, and he still had to take a separate magnesium supplement.

- Benjamin Baker from San Antonio

Comparison With Other Products

A doctor holding other multivitamins aside from one a day

The last thing I want to highlight is how this product compares to some other supplements that we’ve seen proven benefits from.

Here are three products:

  • Ritual Essential Vitamins: We’ve seen the best success with this product after measuring blood test results. It delivers Omega-3 and a higher dose of vitamin K than One A Day.
  • The Transparent Labs Multivitamin: This is another popular one with our clients. It’s ideal for athletes as it has a higher dose of magnesium and zinc compared to One A Day.
  • ONNIT Total Human: This supplement is a great choice for athletes who want to tailor their intake to a more precise measure, which you can’t do with One A Day.


Is Men’s One A Day A Good Multivitamin?

Men’s One A Day is a reasonably good multivitamin, but it falls short on the dosage of some important nutrients. It’s low on both magnesium and vitamin K, which can be important for athletes.

Do One A Day Men's Vitamins Work?

Yes, One A Day Men’s Vitamins work, but the overall measured effect is not as good as with other supplements. Our blood test results showed an increase in vitamins and minerals, but not as much as we expected.

Our Verdict on One A Day Multivitamin

Based on our research, testing, and feedback from a nutritionist, we’re not recommending that you take One A Day Men’s Multivitamin. The results are just not good enough, considering that this isn't the cheapest option available.

Instead, I recommend you try out Ritual Essential Multivitamins for Men. It has much better-quality ingredients for better absorption and a higher dose of vitamin K2.

Our #1 Recommendation

CTA of Ritual Multivitamin 18+ for Men

Ritual Multivitamin 18+ for Men

Overall Score 5.0
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