My Review: Kirkland Sleep Aid (2024) – Any Side Effects?

It’s time to review Kirkland Sleep Aid – a supplement that's actually very affordable.

But do you think it's worth trying?:

  • a lot of side effects
  • affordable price
  • works slow

Or are there any proofs that it's not good at all?

Let's discuss the details of the product in the following lines.

Note: This review is based on my opinion + research on Kirkland Sleep Aid.

Review Summary

Full Name: Kirkland Signature Sleep Aid by Kirkland

Product Type: Sleep Supplement

Best Actual Prize: Around $13

Cheapest Place To Buy: Amazon

Designed For: Reducing any sleep difficulty

My Rating: 5 out of 10

Recommended?: Not really – there are some red flags about it:

  • only one ingredient
  • triggers side effects
  • tends to work slow

If you want, you may check the best sleep supplement I know instead, for a good alternative.


What I Liked About It

  • Decent formula
  • Easy to take (1 pill/day)
  • Made by a reputable brand
  • Affordable price tag
What I Didn’t Like About It

  • Triggers some side effects
  • Works pretty slow
  • Its ingredients has some low doses
  • No official website (only sold in Costco)
  • Many potential fake versions available



Kirkland Sleep Aid In A Nutshell

In general – Kirkland Sleep Aid is considered a sleep supplement.

Almost all people know that it's available over-the-counter.

Also – it's one of the affordable supplements out there.

However, I found some disadvantages about it:

  • only one active ingredient
  • works pretty slow
  • causes opposite effects
  • several fake versions

I also want to mention that it doesn't really have an official website.

But Costco caters to it – so it's safe to say that it's legit and not a scam.

Now – a lot of 3rd party sellers offer it too, but be careful not to get a fake version.

The price of 192 tablets (2 x 96) is $13.25, which is quite budget-friendly.

It can also last up to 192 days, since it only requires one pill per day.

So if it works for you, then it's a good deal.

Again – there are some notable side effects, so it's still up to you to try it or not.

However, I just think that there are better options out there with fewer side effects.

Also – those alternatives are really made for insomnia and sleep problems.



#1 – Claims & Producer

Before anything else, let's start with some general info about Kirkland Sleep Aid:

  • who is the producer
  • how it works
  • which health issues it targets
1. Claims

I want to say right away that Kirkland Sleep Aid only has a short description.

So don't expect a lot of claims and promises about it.

Now – it states to be the “top recommended over-the-counter nighttime sleep-aid.”

Based on its description, here's what it does:

  • reduces difficulty in falling asleep
  • aids occasional sleeplessness
  • fast-acting and non-habit forming

Also – another feature claims that it's an easy to swallow medication.

So that the size of its pills is smaller than usual.

Other than that, there's nothing special about it.

If you ask me, it looks like a typical over-the-counter supplement.

2. Producer

The company behind this sleep supplement is Kirkland Signature.

As far as I'm aware, the brand is well-known as offering affordable supplements.

Also – I haven't really found the official website of it.

But you should know that it's catered by Costco.

So at least it's safe to try it – since it's legit and not a scam.

There are also other 3rd party sellers, but it's safer to get it from Costco.


#2 – Ingredients (5 out of 10)

In my opinion, Kirkland Sleep Aid has a decent formulation.

But if you ask me, I wish it had at least some herbal extracts.

I'm not saying that it's bad, but it could be better:

  • only one active ingredient
  • no herbal/natural extracts
  • common formula

Now – the ingredients are divided into two categories.

So let's take a look at what these compounds can do.

1. Active Ingredients

There's only one active ingredient present in Kirkland Sleep Aid.

It is called Doxylamine succinate and it dose is 25 mg.

Based on my research, here's what it can do:

  • relieves symptoms of allergy [1]
  • reduces difficulty in falling asleep
  • helps with nausea and vomiting

If you ask me, it's a popular ingredient for those who have allergies.

But it can also induce sleep in some cases, so it's a good addition.

However – it's not an ingredient I would use in the long run.

At least not as a sleep booster – simply because that's not its main role.

2. Inactive Ingredients

These are the other ingredients worth mentioning:

  1. Dibasic calcium phosphate dihydrate – increases calcium levels [2]
  2. Magnesium stearate – supports deep and restorative sleep [3]
  3. Sodium starch glycolate – helps capsules absorb the water rapidly [4]

Although these compounds are decent, they don't do a lot.

They're basically inactive – so they're not directly involved into the sleep process.

So don't expect the overall formula to be amazing.

I just see these ingredients as just decent addition to the supplement.


Overall – Kirkland Sleep Aid has a decent formulation, in my view.

However, I think it could be way better

So although it's an acceptable supplement, there are some way better options.



#3 – Pills & Dosage (8 out of 10)

In this chapter, I will discuss some of the basic info about Kirkland Sleep Aid.

1. Pills

Let me describe Kirkland Sleep Aid to you:

  • formulated as caplets
  • slightly smaller in size
  • light blue pills

If you ask me, these pills are really easy to swallow – since they are flat and small.

So I don't think that you would have any problems with this product.

2. Dosage

Now – this part is probably the best feature of Kirkland Sleep Aid.

Based on its usage instruction, it only requires 1 pill per day.

Now – you should take the supplement 30 minutes before going to bed.

I think the main reason for this is to wait for it to kick into your system.

Also – it's advisable to be taken by adults and children 12 years and older.

Overall, I couldn't comment more on its usage instruction since they are pretty simple.



#4 – Results (7 out of 10)

In order to see how a product work, I always check out its authentic reviews.

I tend to check the comments from other retailers – since they are more authentic.

Also, I do this to avoid giving you any biased views.

Note: I only analyzed authentic reviews, not promotional or fake ones.

1. Positive Opinions

Now – Kirkland Sleep Aid is available at Costco, as I mentioned before.

But I chose to feature the reviews on Amazon, since they are more honest:

  1. Most of the customers with chronic insomnia said that it helped them.
  2. Some mentioned that it fixed their sleeping pattern after a long-term use.
  3. Others experienced undisturbed sleep throughout the night.
  4. The rest really liked the fact that it's the best price in the market.

After checking the reviews, it had a total of 4.6/5 stars rating.

So in my view, it looks like a lot of people were satisfied with it.

Also – a lot of previous buyers felt an overall improvement in their sleep.

2. Negative Opinions

Let's briefly mention the complaints of other customers who didn't really like it:

  1. Some said that it's not too helpful in aiding sleep.
  2. Others experienced some side effects after using it.
  3. A few customers mentioned that one pill is not enough.
  4. The rest said it didn't work at all and they don't recommend it.

Now – other customers didn't like Kirkland Sleep Aid because it works slow.

So I guess the main reason could be the low dose of its ingredients.

Also – the lack of other compounds that aids sleep could also be another issue.


To summarize, Kirkland Sleep Aid is effective in many of the customers who bought it.

But – you should also consider that it's not for people who have serious sleeping issues.

Overall, I suggest you to look for better options .




#5 – Side Effects (4.5 out of 10)

One of the major complaints about Kirkland Sleep Aid are its side effects.

So if you're curious, here are the experiences of other buyers:

  • serious headaches and palpitations
  • grogginess and tiredness
  • drowsiness and mood swings
  • nightmares and worsen insomnia
  • opposite effects (stay up all night)
  • itchiness and dry mouth

Now – these side effects are not something that you should get from a sleep supplement.

The main reason could be the active ingredient being an antihistamine.

It might be the substance that makes people really groggy.

But I'm not saying that you will experience all of these reactions with this product.

So you should at least be aware that you might experience one of them (isolated cases).

Overall – I recommend you to get a real sleep supplement instead, with fewer side effects.


#6 – Price (7 out of 10)

So far – I can say that Kirkland Sleep Aid is quite affordable.

But it's still up to you to decide if it's really worth it.

1. The Exact Price

As I said before, Kirkland Sleep Aid is available at Costco.

However – it's only sold from their warehouse and not available online.

So I will just give you the deals on Amazon:

  • 192 Count (Pack of 1) costs $13.25
  • Free delivery on selected dates
  • Refundable and replaceable

Now – the package includes 2 bottles with 96 tablets each.

So if we're going to approximate the price of a single bottle, it would be around $6.60.

Overall – Kirkland Sleep Aid has an affordable price tag, in my view.

But you need to consider the other factors of it before judging if you want to try it or not.

2. Competitors’ Price

Let me give you a real deal, it's my #1 recommended sleep supplement.

The product I'm talking about is called Sleep Support Plus:

  1. Sleep Support Plus is a supplement that is really made to aid sleep.
  2. It has a mix of unique and clinically tested ingredients.
  3. Kirkland Sleep Aid has one active ingredient in it.
  4. But the overall formulation tends to work slower than expected.
  5. Sleep Support Plus requires only 2 capsules before bedtime for an optimal effect.
  6. Meanwhile, Kirkland Sleep Aid only requires one pill per day.
  7. Sleep Support Plus can be bought for only $19 from its original price of $28.
  8. The price of Kirkland Sleep Aid is $13.25.

Honestly – Sleep Support Plus is the best choice between these 2 products.

Even though it has a slightly higher price, it's superior in all aspects.

So I urge you to go for it instead and truly get your money's worth.


Overall – Kirkland Sleep Aid has an affordable price and it lasts for 192 days.

However, it might not work for you at all.

So I recommend that you choose a better alternative that is more worth buying.




#7 – Final Conclusions

Here's how I would summarize my opinion about Kirkland Sleep Aid.

1. Decent Ingredients

If you ask me, Kirkland Sleep Aid has a decent formula but not the best one:

  • only one active ingredient
  • it's a type of antihistamine that can induce sleep

However – the doses are quite low ,so don't expect it to work fast.

Also, there are instances that might not work at all for some people.

2. Side Effects

Now – Kirkland Sleep Aid can trigger adverse reactions in some cases.

The most common effect are grogginess and the reverse effect (sleepless nights).

In general, a good sleep supplement should not work that way – so it's a red flag.

That's why you should at least be warned.

3. Good Price

Lastly – Kirkland Sleep Aid has a fair pricing for an over-the-counter supplement.

It only costs $13.25 for 192 tablets that can last for 192 days.

So if it works for you, then it's a good deal (compared to others).



My Verdict – Worth It Or Not?

Short answer: Not really – there are some red flags about it:

  1. Official website is only Costco
  2. Tends to work slow
  3. Only one active ingredient
  4. Can cause side effects
  5. Fake versions (untrusted websites)

Again – I'm not saying that it's a bad product, but it could be a lot better.

If you don't have any serious sleep issues, it could work for you.

But it's a form of antihistamine, so it might not go well for others.

So what do I recommend instead?

Now – I have a better option for you that is a real sleep supplement.

I'm talking about the supplement Sleep Support Plus:

  • Contains an original mix of ingredients
  • Mechanism of action is unique
  • Fewer chances of adverse reactions
  • Really affordable
  • Great effect for insomnia and sleep

If you're on a budget, Kirkland Sleep Aid is a good product – but it's not the best.

So I strongly suggest you to try Sleep Support Plus instead, since it's a lot better (in my view).

It's also really affordable, so you won't be spending a lot more.

Overall – it's superior in all aspects and it will really aid with sleep.


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Written by 

Paula has a background in Chemistry and continues to pursue further studies in it. She loves searching for the best products in the market that will give excellent benefits to the human body and share them with you.

Last updated: May 15, 2024

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