PlainVitamins

amino acid

Proline supplements

Half of the 387 proline supplements in the NIH label database that print an amount list 487.5 mg or less per serving; the middle half list 100 mg to 1,289 mg (DSLD version 9.4.0, January 2026). The 25 products whose only supplement ingredient is proline list a median of 1,000 mg.

Products listing it
584387 print an amount; 197 list it inside a blend without an amount
Median per serving
487.5 mgmiddle half 100 mg to 1,289 mg

How much proline do supplements contain?

The median product lists 487.5 mg per serving. One in ten lists 45 mg or less, one in ten 1,671 mg or more. The amount printed most often is 100 mg (28 products).

Products by amount of proline per serving

387 products, log scale; extreme 0.2% at each end left out of the drawing.

Proline: products by amount per serving1 mg10 mg100 mg1,000 mg
Proline: products by amount per serving1 mg3 mg10 mg100 mg1,000 mg
Proline: products by amount per serving1 mg3 mg10 mg30 mg100 mg300 mg3,000 mg
Proline: products by amount per serving1 mg3 mg10 mg30 mg100 mg300 mg1,000 mg3,000 mg
Proline: products by amount per serving1 mg3 mg10 mg30 mg100 mg300 mg1,000 mg3,000 mg
The amounts printed most often
Amount per servingProductsFor example
100 mg28 Wrinkle Free Skin Formula (Vitabase); Arthrit-Eze (Xtendlife); Hyaluronic Acid 100 mg With Co-Factors (Protocol For Life Balance)
50 mg18 Nails (Viva Vitamins); Joint Support (Meijer Naturals); Cardio-Klenz (Xtendlife)
500 mg18 Gut Feeling Max (HoltraCeuticals); Pure L-Proline USP Pharma Grade Powder (Hard Rhino); Pure L-Proline 500 Milligrams (Montiff)
1,000 mg12 L-Proline 500 mg (NOW); L-Proline 500 mg (Best Naturals); Innoflex Ultra Strength Lemon Lime (NutraKey)
2,000 mg10 L-Proline (PureBulk.com); 100% Pure L-Proline (NutraBio); 100% Pure L-Proline 2000 Milligrams (NutraBio)
45 mg7 Amino Acid Complex (Bronson); Amino Acid Complex (Bronson Laboratories); All Insurance Vitamin Powder (Bronson Laboratories)
150 mg7 Heartbeat Elite (Carlson); Cardio Complete (Carlson); Amino Acid 750 mg (Bluebonnet)
200 mg7 Collagen Forte (Douglas Laboratories); Matrixx (Allergy Research Group); Connection (NutriCology)
1,644 mg7 Collagen Hydrolysate Apple + Cucumber Flavored (Great Lakes Gelatin Co.); Collagen Bone Hydrolysate Unflavored (Great Lakes Gelatin); Pork Gelatin Unflavored (Great Lakes Gelatin)
80 mg6 Skin Support Pack (Douglas Laboratories); Max-Amino Caps with Vitamin B6 (Country Life); Longer, Stronger Hair and Nails (Irwin Naturals)

Source: Supplement Facts rows of every product's current label, NIH ODS Dietary Supplement Label Database version 9.4.0; amounts in one measure (weight).

Which products list the most proline?

On-market products, per serving, with a plausible amount: the rule leaves out likely entry slips, such as an amount far beyond every other label with no %DV or strength on the label to back it (each product page still shows its own amount, marked).

Have the amounts changed over the years?

Products whose current label entered DSLD in 2012 list a median of 648 mg; those entered in 2024, 354 mg.

Median proline per serving by the year the label entered DSLD (years with 20+ products)
YearProductsMedian per serving
201238648 mg
201348451.5 mg
2014251,419 mg
201721182 mg
2018211,438 mg
202047700 mg
202122202.75 mg
202227250 mg
202331167 mg
202429354 mg

Source: DSLD label entry dates and amounts, current labels.

In which products and brands?

Products listing proline by DSLD product type

Proline by product typeOther Combinations257Amino acid/Protein117Botanical with Nutrients12Multi-Vitamin and Mineral (MVM)1
Proline by product typeOther Combinations257Amino acid/Protein117Botanical with Nutrients12Multi-Vitamin and Mineral (MVM)1
Proline by product typeOther Combinations257Amino acid/Protein117Botanical with Nutrients12Multi-Vitamin and Mineral (MVM)1
Proline by product typeOther Combinations257Amino acid/Protein117Botanical with Nutrients12Multi-Vitamin and Mineral (MVM)1
Proline by product typeOther Combinations257Amino acid/Protein117Botanical with Nutrients12Multi-Vitamin and Mineral (MVM)1

Brands listing it most: Douglas Laboratories (17), Metabolic Nutrition (10), Bronson (9), Xtendlife (8), NOW (8), Natural Factors VegiDay (8), Universal (7), Ortho Molecular Products (7), NewtonEverett (6), Solgar (6).

Every product listing proline

584 products, A to Z by name (page 8 of 12), each with the amount its label prints; an amount far outside what other labels print is marked as a possible slip.

Where next?