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Swanson Amino Acid Dl-Phenylalanine 500 Milligrams 100 Capsules
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Brand | Swanson Premium Brand |
Primary Supplement Type | Swanson Amino Acid Dl-Phenylalanine 500 Milligrams 100 Capsules |
Unit Count | 100.00 Count |
Item Form | Capsule |
Item Weight | 3.04 ounces |
Item dimensions L x W x H | 2.3 x 2.3 x 4.4 inches |
Product Benefits | Energy Management |
Age Range (Description) | Adult |
Package Information | Bottle |
Number of Items | 1 |
About this item
- An amino acid supplement for specialized dietary support
- Plays a key role in neurotransmitter function
- Full Spectrum formula features plant-based ingredients without unnecessary processing
- For nearly 50 years, Swanson has delivered science-backed health products worldwide. Each wellness supplement is made in our GMP certified facilities, and our purity and potency testing includes independent third-party labs
- We're control freaks... in a good way! For nearly 50 years, Swanson Health has delivered science-backed health products worldwide. In 1969, we began in Fargo, ND, with a mission to offer wellness solutions that help people live simply healthier together. Our facilities are Good Manufacturing Practice (GMP) certified, and our purity and potency testing includes independent third-party labs. Clinical research, scientific consensus and usage traditions guide our innovation
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It all started in the small town of Fargo, North Dakota way back in 1969 with a mission to find natural remedies for things like achy joints. Since then, our team of pharmacists, licensed nutritionists and scientists have crafted thousands of powerful supplements to better the lives and wellbeing of everyone. If you’re ever looking to make your life a little happier or healthier, you just let us know. We’d be tickled pink to help.
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What is our mission?
Our mission is to provide our customers with trusted health products to benefit their minds, bodies and homes. In other words, treat them like family.
What do we stand for?
We’re all about helpin’ to make sure that everyone can enjoy healthier lives, regardless of where they may be on their journey or what their health goals may be.
Why choose Swanson?
Since 1969 we’ve built a reputation for quality and purity backed by our in-house team of pharmacists, licensed nutritionists and scientists. After more than 50 years, that heritage of excellence shows in every product we offer.
Product Description

•An amino acid supplement for specialized dietary support
•Plays a key role in neurotransmitter function*
•500 mg per capsule
Get a nutritional boost with Swanson DL- Phenylalanine (DLPA)! A great source of amino acid precursors for neurotransmitters that support brain health, DL-Phenylalanine is an essential amino acid that cannot be made in the body and must be supplied by food.*
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

SIMPLIFYING WELLNESS
Health & Vitality
Our goal is to provide you with science-backed, simplified health and wellness solutions to nurture your wellness journey every day.
We believe in health and vitality at every age, which is why our nutrition scientists and innovation experts continually search the globe for better ingredients and new scientific research findings to create vitamins, supplements and wellness products that fit easily into your modern life.
CELEBRATING HEALTH
Innovation & Research
At Swanson, we get it! Nutrition and exercise needs can change due to lifestyle, environment, work, illness, age and more.
Our products are inspired by clinical research backed by scientific consensus. Each is formulated to deliver the highest quality with the lowest environmental impact. Our nutritional supplements and wellness products are trusted by healthcare practitioners and consumers worldwide.
FOUNDED IN AMERICA
Strong Heritage
Our story began in Fargo, North Dakota, when a man with a passion for golf was looking to lessen his joint pain. His research into the benefits of vitamins and supplements nurtured a deep commitment to wellness at every age and a desire to share his findings with others. In 1969, our first product was vitamin E to support cardiovascular health and antioxidant activity to neutralize free radicals.* Today, we offer thousands of innovative, science-backed wellness solutions and nutritional supplements that help people live SIMPLY HEALTHIER TOGETHER.

GMP-VERIFIED MANUFACTURER
Good Manufacturing Practices
We take quality seriously, and that's why we are voluntary members of NSF International and follow Good Manufacturing Practices to ensure that our procedures are the best they can be.
Quality Testing
Our quality testing includes, but is not limited to:
- Purity (HPLC): testing raw ingredients before manufacturing to make sure that they are pure; we compare to a standard with a known concentration
- Potency (HPLC): testing finished products to ensure they meet label claims
- Identity (HPLC, FTIR or HPTLC): testing all raw ingredients; the HPTLC is for botanicals only while all other ingredients are tested through HPLC or FTIR
- Microbiology (Biolumix): testing all raw ingredients and finished products for aerobic bacterial count, yeast and mold, Salmonella, E. coli and more
- Heavy Metals & Metal Assays (ICP-MS): testing includes lead, mercury, cadmium, arsenic and more done on all raw ingredients and finished products, plus minerals such as magnesium, calcium and more.

PURITY & POTENCY
By following strict guidelines, we ensure our products are carefully and rigorously tested for both purity and potency.
Third-Party Testing
These labs are ISO 17025 Certified. ISO/IEC 17025 is the standard accreditation most labs must hold in order to be deemed technically competent. Laboratories use ISO/IEC 17025 to implement a quality system aimed at improving their ability to consistently produce valid results.
Industry Regulations (FDA & FTC)
Swanson complies with both Food and Drug Administration (FDA) and the Federal Trade Commission (FTC) guidelines. These ensure that consumers can trust the label information and safety of all our products. Virtually all facets of supplement manufacturing, labeling and marketing are covered by extensive regulations issued and enforced by the FDA and FTC.
* These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.

Product details
- Product Dimensions : 2.3 x 2.3 x 4.4 inches; 3.04 ounces
- Item model number : 0087614018737
- Date First Available : October 25, 2004
- Manufacturer : Swanson Premium Brand
- ASIN : B002MQC1NY
- Country of Origin : USA
- Best Sellers Rank: #244,896 in Health & Household (See Top 100 in Health & Household)
- #11,473 in Blended Vitamin & Mineral Supplements
- Customer Reviews:
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This Item ![]() Swanson Amino Acid Dl-Phenylalanine 500 Milligrams 100 Capsules | Recommendations | |||||
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Price | $12.92$12.92 | $17.96$17.96 | -5% $9.49$9.49 Typical: $9.99 | $15.99$15.99 | $18.31$18.31 | $8.99$8.99 |
Price Per Unit | $0.13 / count | $0.10 / count | $0.09 / count | $0.09 / count | $0.31 / count | $0.15 / count |
Delivery | Get it as soon as Tuesday, May 6 | Get it as soon as Tuesday, May 6 | Get it as soon as Tuesday, May 6 | Get it as soon as Tuesday, May 6 | Get it as soon as Tuesday, May 6 | — |
Customer Ratings | ||||||
Sold By | Pattern Products | BulkSupplements | Axio Supply | Carlyle | LUMlNlZE | Amazing Vitamins & Essentials |
keyword type | multiple-vitamin-mineral-combinations | multiple-vitamin-mineral-combinations | multiple-vitamin-mineral-combinations | multiple-vitamin-mineral-combinations | amino-acids | multiple-vitamin-mineral-combinations |
form | Capsule | Capsule | Capsule | Capsule | Veg Cap | Capsule |
flavor | — | Unflavored | — | Unflavored | — | Unflavored |
size | 100 Count (Pack of 1) | 180 Count (Pack of 1) | 1 Count (Pack of 100) | 180 Count (Pack of 1) | 60 Count (Pack of 1) | 60 Count (Pack of 1) |
weight | 0.19 pounds | 0.3 pounds | 0.07 kilograms | 6.45 ounces | 0.15 pounds | 0.06 kilograms |
age range | Adult | Adult | All Ages | Adult | Adult | Adult |
product benefit | Energy Management | Brain Health Support | Energy Management | Nutritional Supplement | Energy Management | Dietary Supplement |
serving suggestion | One Capsule | One Capsule | — | 2 capsule | — | 2 Capsules |
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Important information
Safety Information
For adults only. Consult your healthcare provider before using this or any product if you are pregnant or nursing, taking medication or have a medical condition. Keep out of reach of children. Do not use if seal is broken. Store in a cool, dry place.
Ingredients
DL-Phenylalanine 500 mg *,Other ingredients: Gelatin, magnesium stearate.,As a dietary supplement, take one capsule one to two times per day with water.,Do not take this product if you are pregnant or nursing, have phenylketonuria, or are taking MAOIs, levodopa, or antipsychotic medications. Consult your healthcare provider before use if you take any prescription medications.
Directions
Follow usage directions on label.
Legal Disclaimer
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.
Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers find the amino acid supplement helps with energy, mood, and focus, with one noting it works well for ADHD. The product receives positive feedback for its quality and functionality, with one customer mentioning it works as well as more expensive brands. They appreciate its effectiveness for pain and anxiety relief, and one notes it's more effective when taken on an empty stomach. Customers like the great price and report no jitters or crashing side effects.
AI-generated from the text of customer reviews
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Customers report positive effects from this amino acid supplement, noting it provides energy and focus while keeping them in a good mood. One customer mentions it helps with depression, and another notes it's beneficial for ADHD.
"...The results have been fabulous. It helps me stay focused, more energy and happier throughout the day...." Read more
"Make me feel energized, boosted my mood for a week or so, but then started making me feel a bit irritable, sleepy? Don’t ask me why...." Read more
"...I think everyone is different but it does seem to help keep me focused during the day...." Read more
"...Motivation in a bottle." Read more
Customers are pleased with the quality of the amino acid supplement and find it reliable, with one customer noting it's suitable for prolonged use.
"...Don’t ask me why. But still a good product I think m for the right people . Also a great price!" Read more
"...It's not a jittery, strong out feeling and I don't realize it's even kicked in until I'm busily getting things done. I'll be reordering for sure." Read more
"Very pleased with the quality of this product. It works as advertised. The one reccomendations...." Read more
"...Tried this brand for the price and quality. It is working as well as a more expensive brand I had been using...." Read more
Customers find that the amino acid supplement works well, with one customer mentioning it effectively manages their anxiety disorder and another noting it performs as well as more expensive brands.
"...The follow through is incredible...." Read more
"Very pleased with the quality of this product. It works as advertised. The one reccomendations...." Read more
"...Tried this brand for the price and quality. It is working as well as a more expensive brand I had been using...." Read more
"Perfect. Delivered as promised. Product fine." Read more
Customers find the amino acid supplement effective for pain and anxiety relief, with one customer noting it's more effective when taken on an empty stomach.
"...It keeps me up at night if I take it after 3pm." Read more
"...I just took it and within an hour the lethargy went away, just poof...." Read more
"...; although it does not always work it has often kept me from needing my migraine medication and for that I will come back for it time and again." Read more
"This supplement is great for waking me up and clearing the fog. I take it first thing in the morning on an empty stomach plus coffee...." Read more
Customers find the amino acid supplement offers great value for money.
"...But still a good product I think m for the right people . Also a great price!" Read more
"...n't noticed a change in my mood, body or health but for the price they're worth it and who knows they might be changing me and I just haven't..." Read more
"Fast shipment, great value for the mg and count! These really give me a boost all day...." Read more
"Does what it's suppose to! And at a reasonable price. I take one a day and I believe it helps with my energy level." Read more
Customers report positive experiences with this amino acid supplement, with one mentioning it provides relief from nervousness without causing jitters or crashes.
"...There are no jitters or crashing, it’s literally like the most amazing thing I’ve ever taken in my life! Motivation in a bottle." Read more
"...It's not a jittery, strong out feeling and I don't realize it's even kicked in until I'm busily getting things done. I'll be reordering for sure." Read more
"...It takes the edge off of my anger and nervousness without leaving me spacey..... Best thing ever!!!!" Read more
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- Reviewed in the United States on March 19, 2018Before taking DLPA, my life was miserable with miserable with chronic fatigue syndrome. Few things made any difference. About the only thing that helped was Ritalin and it wasn't the best. Now that I am taking Dl-Phenylalanine (also known as DLPA), my days are much better. I've been working hard to fine tune it. Here are the results.
I've been taking DLPA from various companies for several months. The results have been fabulous. It helps me stay focused, more energy and happier throughout the day. The Swanson 500 mg seems to work as well for me as more expensive brands and even as well as one that says it has 1000mg. I set my first alarm early and take one about 6am then try to go back to sleep until my second alarm at 7am and time to get up. I feel much more refreshed getting up with Dl-Phenylalanine. Later, at noon, I start to drag a lot. I try to take a brief 15 nap at lunch time followed by another Dl-Phenylalanine. If I can't get a noon nap for whatever reason, my nest choice is take 2 DLPAs at noon. It keeps me up at night if I take it after 3pm.
- Reviewed in the United States on August 14, 2019Make me feel energized, boosted my mood for a week or so, but then started making me feel a bit irritable, sleepy? Don’t ask me why. But still a good product I think m for the right people . Also a great price!
Make me feel energized, boosted my mood for a week or so, but then started making me feel a bit irritable, sleepy? Don’t ask me why. But still a good product I think m for the right people . Also a great price!
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- Reviewed in the United States on February 11, 2014It seems this product does impact me- I have noticed that I cannot take it after 4 pm or I cannot sleep. I think everyone is different but it does seem to help keep me focused during the day. Wish I could take after work without it interferring as this is the time period I could use the oomph....
- Reviewed in the United States on March 1, 2019For well over a year now I’ve been suffering from severe fatigue and lethargy bc of prescribed meds as well as an autoimmune issue.
In my head I know what I need to do, but putting forth the action is another story. And it sucks. The constant fatigue and not accomplishing my daily goals, some which would include even just showering.
I’ve been taking these for a week now and I’m like a totally different person. The follow through is incredible. I’m doing what I want to accomplish and then some including going to the gym and having more stamina with lifting etc.
In the morning with my regular supplements I take one of these. By mid afternoon, no later than 3 or 4, I take a second one.
There are no jitters or crashing, it’s literally like the most amazing thing I’ve ever taken in my life! Motivation in a bottle.
- Reviewed in the United States on November 26, 2018I've used about half the bottle and I find that I do have more energy when I take this. It's not a jittery, strong out feeling and I don't realize it's even kicked in until I'm busily getting things done. I'll be reordering for sure.
- Reviewed in the United States on October 27, 2018I've had pretty bad anxiety for a few years and finally began taking a pharmaceutical for it. The side effect was lethargy and I had a lot of difficulty finding motivation to do much other than sleep. When I take this supplement it truly counters that effect. I have a toddler who ran off with the bottle and I didn't realize I was missing it from my routine until I found the bottle. It had been about a week where I was debating whether or not the anti anxiety meds were worth it. I just took it and within an hour the lethargy went away, just poof. I came to review it immediately because it's often that we don't really know what's working when we take a lot of vitamins, but I know for sure that this is something I shouldn't be without whole dealing with the other side effect. By the way, I learned today that the med I'm taking works similar to antihistamine, which is like the Benadryl effect.
- Reviewed in the United States on December 31, 2016A pill to make you feel better about your symptoms. Hmm. forget it. pills don't fix stupid.
- Reviewed in the United States on June 18, 2020Like I said I’m pharmacist and do like this supplement in general. Although I haven’t noticed a huge difference myself, I do feel that every now and then it does help a little and helps with a little energy and focus and for the most part is safe as it mimics a natural amino acid in your body. However, vitamins and/or dietary supplements are called that so they don’t have to go through all of that testing by the FDA like other drugs do, therefore, they aren’t allowed to make claims on the packaging only suggestions, aren’t subject to putting everything on the label that “drugs” are, and aren’t tested as thoroughly so one bottle from one lot can vary greatly from the next. I have ordered this brand a couple times because of the price. It is quite a bit cheaper than the other brand I typically buy and tend to like better as well as its dose, but the prices of both keep going up so I will buy this in between the other brand to even it out some for like I said I don’t notice a HUGE difference in either one but do like to take it
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