30 servings · 120 capsules

MPS185
DL-185®.

★★★★★★★★★★ 4.7 40 ratings
£39.99£1.33 / serving
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  • ✓2000mg DL-185® dileucine per four-capsule serving
  • ✓Four capsules a day, 30 servings from 120 capsules
  • ✓Two leucine molecules bonded together, known as dileucine
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“Great to see this available in Europe, Efectiv are ahead of the curve.” Myles O'Reilly, verified buyer

14-day returnsGMP-certified facilitiesMade in the UKVegan friendly
ISO 22000 facility✳2000mg DL-185®✳Dileucine dipeptide✳Employee owned · est. 2013✳
ISO 22000 facility✳2000mg DL-185®✳Dileucine dipeptide✳Employee owned · est. 2013✳
The formula

One active. 2000mg.

DL-185® is two L-leucine molecules enzymatically bonded together. Four capsules carry 2000mg.

01 · The dipeptide
2000mg
DL-185® Dileucine

L-Leucyl-L-Leucine Monohydrate. 2000mg per four-capsule serving.

02 · The serving
4 capsules
One serving

30 servings in each tub. Take four capsules daily with water, ideally alongside your post-workout meal.

At a glance

What is in each serving.

Three facts from the label, per four-capsule serving.

2000mg
DL-185® dileucine
One active, per four-capsule serving.
4
Capsules a day
One serving, taken with water.
30
Servings
120 capsules per tub.

Amounts as printed on the label.

Transparent label

Inside the capsule.

We don't hide behind proprietary blends. One active at the dose used in the research, every milligram listed.

DL-185®
2000mg
Per four capsules
Four capsules a day, 30 servings from 120 capsules. No proprietary blend, no fractional serving to make the label look better.
Capsule
HPMC
Plant-based shell
Hydroxypropyl methylcellulose rather than gelatin, so the formula stays vegan friendly.
Format
4
Capsules a day
One month of servings per tub. Take them with your post-workout meal. Nothing to mix, no flavour to get bored of.
0g
Sugars
Per four capsules
0g
Fat
Capsule shell only
30
Servings
One month per tub
120
Capsules
HPMC, vegan
Nothing hidden

The full label.

One active, listed first, at the dose used in the research. Ingredients, allergens and nutrition for MPS185, as printed on the tub.

Ingredients

DL185™ Dileucine (L-Leucyl-L-Leucine Monohydrate), Brown Rice Flour (Gluten Free), Silicon Dioxide, Magnesium Stearate, HPMC (hydroxypropyl methylcellulose) Vegetarian Capsule Shell.

Allergen advice

No known allergens. Manufactured in a GMP Certified factory that handles fish, celery, soya, nuts, wheat and gluten.

VEGAN FRIENDLYGMP-CERTIFIED FACILITIESMADE IN THE UK
Nutritional information
Serving size 4 capsules · 30 servings
Per 4 capsPer capsule
DL-185™ Dileucine (L-Leucyl-L-Leucine Monohydrate) 2000 mg 500 mg
Take four capsules daily with water, ideally alongside your post-workout meal.
The research

What the studies found.

DL-185® dileucine has two published human studies at 2g, the amount in four Efectiv capsules. Both were small, and both were funded by Ingenious Ingredients, which developed the ingredient. Here is what each one tested and found, limits included.

How close is the research to this product?
  1. 1 This product Not tested itself
  2. 2 Same ingredient, same daily amount Where these studies sit
  3. 3 Same ingredient, other amounts Not used here
  4. 4 Related ingredients or lab work Not used here
01 · Paulussen 2021 · Journal of Applied Physiology

Muscle protein synthesis after one dose

Who
10 young men
Amount
One 2g dose, against 2g of leucine
How long
Measured over three hours
Design
Randomised, double-blind crossover
What they found

Muscle protein synthesis over the three hours was higher after dileucine than after the same amount of leucine (0.075% against 0.047% an hour). Blood leucine levels were similar.

Limits

Ten people and a single dose, so it says nothing about results over weeks of training.

Funded by Ingenious IngredientsRead the paper ↗
02 · Hagele 2024 · PLOS ONE

Strength across 10 weeks of training

Who
34 resistance-trained men (57 started)
Amount
2g a day
How long
10 weeks, training four days a week
Design
Randomised, double-blind, placebo-controlled
What they found

Leg-press strength rose by 61kg with dileucine, 45kg with leucine and 21kg with a placebo. Dileucine beat the placebo but not leucine. Lean mass, bench press and jump height did not differ.

Limits

Groups of 11 or 12 people, training was not supervised, and the likely size of the effect is uncertain.

Funded by Ingenious Ingredients, and two authors are its principalsRead the paper ↗

This Efectiv product was not itself tested in these studies, and results vary between people. This is a summary of published research on DL-185®, not a promise of results.

Reviewed October 2026
How to use

Four capsules, once a day.

No mixing and no flavour to get bored of. Take them with water, ideally alongside your post-workout meal.

Four capsules,

4
Capsules
Water
Small glass
Daily
Every day
With water
A small glass is all it takes
With food
Take with your post-workout shake or a protein meal
The Efectiv difference

How we compare.

EFECTIV MPS185
Leucine
Structure
Dipeptide, two bonded leucines
Single BCAA
Evidence
Emerging human studies
Decades of research
Dose per serving
2000mg
Varies

Comparison against free-form L-leucine powders and capsules sold in the UK. Checked October 2026.

Verified reviews

What people say.

4.7 ★★★★★★★★★★
Based on 40 verified ratings

Verified MPS185 reviews from customers who bought it, collected by Lipscore. Good or bad, every review is published.

★★★★★★★★★★
Great to see this available in

Great to see this available in Europe, Efectiv are ahead of the curve.

MO Myles O'ReillyVerified buyer
40
Verified ratings
via Lipscore
★★★★★
2000mg DL185™ per Serving, 30-Day Supply

All MPS185 reviews.

Collected & verified by Lipscore
On the label

Quality you can check.

MPS185 is made in the UK to ISO 22000 standards, with every active ingredient printed on the label with its dose.

Ingredients
Listed in full
Formula
Full dosages listed
Manufacturing
UK, ISO 22000
Label
Every dose listed
Kyle Raison
Our athletes
“Everyone is talented at something, you just have to find what your talent is.”
Kyle Raison
PCA Pro · Efectiv Athlete
18
Efectiv athletes
4.7
40 ratings
6
Sports backed
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Before you ask

Questions, answered.

DiLeucine DL185 is a dipeptide form of leucine. 2000mg DL-185® dileucine per four-capsule serving.
Unlike standard leucine, DiLeucine DL185 is bonded as a dipeptide.
2000mg DL-185® dileucine per four-capsule serving.
MPS185 · 30 servings
Rated 4.7 out of 5 from 40 reviews