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Douglas Laboratories® L-Proline 500 mg 60 caps

SKU 7948-60X
Original price $36.25 - Original price $36.25
Original price
$36.25 - $36.25
Current price $36.25

L-Proline 500 mg capsule

L-Proline supplies 500 mg of the amino acid L-proline in each capsule.

Serving Size:1 Capsule
Servings Per Container:60

Amount Per Serving
L-ProlineAmount Per Serving:500 mg
Other Ingredients:
Gelatin (capsule), microcrystalline cellulose, magnesium silicate, vegetable stearate


We work to ensure that product information is correct; however, brands may make changes to products from time to time, and actual product packaging and materials may contain more and/or different information than that shown on our website. Please consult all labels, warnings, and directions prior to using or consuming products for the most accurate product information.

  • Gluten Free
  • Non-GMO
As a dietary supplement, adults take 1 capsule daily or as directed by your health professional.

If you are pregnant, nursing, have any health condition or taking any medication, consult your health professional before using this product.

Keep out of reach of children. Store in a cool, dry place. Use only if safety seal is intact.

Customer Reviews

Based on 35 reviews
Not sure if it works yet

I don't know if it works yet I'm still working on it

Heather S.
Psychiatrist Recommended Magnesium For Anxiety

My psychiatrist actually recommended magnesium. I overruled his suggestion for magnesium oxide to take glycinate instead since oxide is very poorly absorbed. Since I began taking it a few years ago, I've read more about it and decided to add in a few other forms. I wanted to cover a few more bases. So instead of two of the magnesium glycinate capsules, I now take one of them and one of this which comes out to the same total amount of magnesium. (Still no oxide though, but I'm ok with that.) Besides it being suggested as potentially helpful for anxiety, it's required for proper calcium absorption and I definitely wasn't getting enough from my diet.

`Muy pronto para

`Muy pronto para qualificar

Granma D
This particular form of vitamin D is my go to for fighting all viruses during virus season.

Look at the back of the bottle which gives you information on how this product is produced. I always use New Chapter products because they are the best for the pricing I am willing to pay.

Ineffective and Rip off!!

Tried this Proline from Douglas for 15 days and found it to be absolutely INEFFECTIVE! Tried all Proline protocols : Proline , Proline + Lysine + C, Proline + Glycine, Proline + Serine + Threonine + Cysteine Proline should provide following subjective observations. 1. Collagen boost 2. Energy boost 3. Libido boost 4. Improved Digestion 5. Improved Skin This Proline by itself and when combined with other Aminos did *NOT* provide any of the above benefits.! With only 60 capsules at a significant $35, this was a total rip off! Would NOT recommend this to anyone. I bought it based on Douglas brand from iServe, but offlate I am finding that Douglas products are faring much below par - esp after Nestle accusation . I even doubt if there is solid 3rd party testing to ascertain compliance to label in terms of purity, potency and most importantly efficacy! Money down the drain - and NO refund either. I fared much much better on Amino blend and Collage peptides. Buy at your own risk!