Amino acids
Phenylalanine
An essential amino acid from meat, fish, dairy and soy. The body turns it into tyrosine, another amino acid. People with phenylketonuria (PKU) must avoid it.
26 products from US online stores, sorted by what 500 mg of phenylalanine costs – not by the price per pack.
1.8¢Lowest cost
per 500 mg phenylalanine
- Prices checked Nov 1, 2026, US
- No paid placements
What does 500 mg mean?
- phenylalanine per serving in most of the products we checked
- 500–750 mgphenylalanine per serving in most of the products we checked
- 500 mg is about one serving: half of the 26 products we checked have up to 500 mg per serving, the other half more.
- There’s no official daily amount for phenylalanine.
We compare by 500 mg only so products line up – it’s not a recommendation. Not medical advice.
Where products miss quality points
How the 26 products score
- Very good 90+: 0
- Good 75+: 26
- Fair 60+: 0
- Low under 60: 0
- have no seal from an independent testing program
- 100%have no seal from an independent testing program10 of 30 testing points for GMP, 15 for the 2 whose label says “third-party tested”
The full 30 testing points need an independent test. Every supplement sold in the US is made under the FDA’s GMP rules – the maker checks its own products, which gives 10 points. A seal from a testing program like NSF, USP or Informed Choice means a lab outside the company checks that what’s inside matches the label. Most brands don’t take part. That doesn’t make a product bad – without a seal, a clean product still gets up to 80.
We find seals on the label and in NSF’s public lists. USP and Informed Choice don’t let us search their lists automatically, so a seal that’s only in their lists can be missing. How the score works
Pack size
Compare packs of a similar size.
All sizes in one list can affect the results – big packs usually cost less per 500 mg. Pick a size above to compare packs that are alike.
26 products · cheapest per 500 mg phenylalanine first
- Rank 1
BulkSupplements
L-Phenylalanine Powder
L-phenylalanine · Powder
80Good qualityCountry not stated1.8¢per 500 mg
Lowest
- Pack
- $35.972,000 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 2,000 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 2
BulkSupplements
L-Phenylalanine Powder
L-phenylalanine · Powder
80Good qualityCountry not stated2.9¢per 500 mg
61% more
- Pack
- $28.971,000 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 1,000 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 3
BulkSupplements
DL-Phenylalanine Powder
DL-phenylalanine (DLPA) · Powder
80Good qualityCountry not stated3.3¢per 500 mg
86% more
- Pack
- $66.972,000 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 2,000 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 4
BulkSupplements
L-Phenylalanine Powder
L-phenylalanine · Powder
80Good qualityCountry not stated4.4¢per 500 mg
144% more
- Pack
- $21.97500 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 500 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 5
BulkSupplements
DL-Phenylalanine Powder
DL-phenylalanine (DLPA) · Powder
80Good qualityCountry not stated4.4¢per 500 mg
144% more
- Pack
- $43.971,000 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 1,000 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 6
BulkSupplements
DL-Phenylalanine Powder
DL-phenylalanine (DLPA) · Powder
80Good qualityCountry not stated6¢per 500 mg
233% more
- Pack
- $29.97500 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 500 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 7
BulkSupplements
L-Phenylalanine Capsules
L-phenylalanine · Capsules
80Good qualityCountry not stated6.7¢per 500 mg
270% more
- Pack
- $15.97240 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 240 daysif you take 1 capsule (500 mg) a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 8
Nutricost
L-Phenylalanine, 500 mg
L-phenylalanine · Capsules
85Good qualityMade in USA7.2¢per 500 mg
300% more
- Pack
- $12.95180 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 180 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 9
Best Naturals
Dlpa 500 mg
DL-phenylalanine (DLPA) · Tablets
80Good qualityMade in USA7.5¢per 500 mg
317% more
- Pack
- $8.99120 tablets60 servings
- Phenylalanine per serving
- 1,000 mgin 2 tablets
- Pack lasts
- 120 daysif you take 1 tablet (500 mg) a day
shopbestnaturals.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 10
Nutricost
L-Phenylalanine Capsules
L-phenylalanine · Capsules
85Good qualityMade in USA8.3¢per 500 mg
362% more
- Pack
- $14.97180 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 180 daysif you take 1 capsule (500 mg) a day
nutricost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 11
NOW Foods
L-Phenylalanine, 500 mg
L-phenylalanine · Capsules
80Good qualityMade in Canada$0.10per 500 mg
467% more
- Pack
- $12.24120 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 120 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 12
BulkSupplements
L-Phenylalanine Powder
L-phenylalanine · Powder
80Good qualityCountry not stated$0.10per 500 mg
483% more
- Pack
- $20.97200 servings
- Phenylalanine per serving
- 500 mg
- Pack lasts
- 200 daysif you take 500 mg a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 13
Swanson Vitamins
DL-Phenylalanine, 500 mg
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.13per 500 mg
600% more
- Pack
- $12.59100 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 100 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 14
Swanson Vitamins
DL-Phenylalanine
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.13per 500 mg
600% more
- Pack
- $12.59100 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 100 daysif you take 1 capsule (500 mg) a day
swansonvitamins.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 15
Life Extension
D, L-Phenylalanine, 500 mg
L-phenylalanine · Capsules
80Good qualityCountry not stated$0.14per 500 mg
692% more
- Pack
- $14.25100 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 100 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 16
Source Naturals
DLPA, 750 mg
DL-phenylalanine (DLPA) · Tablets
80Good qualityCountry not stated$0.15per 500 mg
753% more
- Pack
- $13.8060 tablets
- Phenylalanine per serving
- 750 mgin 1 tablet
- Pack lasts
- 60 daysif you take 1 tablet (750 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 17
BulkSupplements
DL-Phenylalanine Capsules
DL-phenylalanine (DLPA) · Capsules
80Good qualityMade in USA$0.19per 500 mg
964% more
- Pack
- $22.96240 capsules120 servings
- Phenylalanine per serving
- 500 mgin 2 capsules
- Pack lasts
- 120 daysif you take 2 capsules (500 mg) a day
bulksupplements.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 18
Carlson
DLPA, DL-Phenylalanine, 500 mg
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.20per 500 mg
1,037% more
- Pack
- $12.2760 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 19
Solgar
DLPA, 500 mg
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.21per 500 mg
1,080% more
- Pack
- $21.23100 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 100 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 20
Source Naturals
Dlpa
DL-phenylalanine (DLPA) · Tablets
80Good qualityCountry not stated$0.22per 500 mg
1,134% more
- Pack
- $19.9860 tablets
- Phenylalanine per serving
- 750 mgin 1 tablet
- Pack lasts
- 60 daysif you take 1 tablet (750 mg) a day
sourcenaturals.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 21
Carlson
DLPA (DL-Phenylalanine)
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.24per 500 mg
1,238% more
- Pack
- $14.4460 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (500 mg) a day
carlsonlabs.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 22
Solaray
L-Phenylalanine, 500 mg
L-phenylalanine · Capsules
80Good qualityCountry not stated$0.26per 500 mg
1,354% more
- Pack
- $15.6960 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 23
LifeSeasons
Dlpa
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.29per 500 mg
1,522% more
- Pack
- $14.0060 capsules30 servings
- Phenylalanine per serving
- 800 mgin 2 capsules
- Pack lasts
- 30 daysif you take 2 capsules (800 mg) a day
lifeseasons.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 24
Solaray
DLPA, 500 mg
DL-phenylalanine (DLPA) · Capsules
80Good qualityCountry not stated$0.30per 500 mg
1,595% more
- Pack
- $18.2960 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (500 mg) a day
vitacost.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 25
Bluebonnet Nutrition
Dlpa 500 mg
DL-phenylalanine (DLPA) · Capsules
80Good qualityMade in USA$0.38per 500 mg
2,027% more
- Pack
- $22.9560 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 60 daysif you take 1 capsule (500 mg) a day
bluebonnetnutrition.com (opens in a new tab)Checked Nov 1, 2026 · Label
- Rank 26
Bluebonnet Nutrition
Dlpa 500 mg
DL-phenylalanine (DLPA) · Capsules
80Good qualityMade in USA$0.45per 500 mg
2,402% more
- Pack
- $13.5030 capsules
- Phenylalanine per serving
- 500 mgin 1 capsule
- Pack lasts
- 30 daysif you take 1 capsule (500 mg) a day
bluebonnetnutrition.com (opens in a new tab)Checked Nov 1, 2026 · Label
Good to know
- Fact
- 2,402%more per 500 mg for the most expensive product than for the cheapest.
- Fact
- 86%more per 500 mg for the cheapest dl-phenylalanine (dlpa) than for the cheapest l-phenylalanine.
How we checked: one-time price for each size in the store’s US online shop, before sales tax and shipping, without subscriptions or coupons. Prices change often, so check the store before you buy. More on how we check
The amount we compare by only makes products comparable – it is not a dosage recommendation. Not medical advice.
How we calculate
Cost per dose = price ÷ (servings × amount per serving) × comparison amount. Example: $119.99 for 74 servings with 24 g of protein each is 1,776 g of protein. $119.99 ÷ 1,776 g × 30 g = $2.03 per 30 g of protein.
Found a mistake or a product we should add? Email us