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Animal data onlyNot FDA approved

IGF-1 LR3 dosage

Also known as: Long R3 IGF-I · LR3IGF-I · IGF LR3 · Long Arg3 IGF-1

Updated 20 sources

Every IGF-1 LR3 protocol on file, 10 in all, labelled by where each number came from.

Calculate with IGF-1 LR3IGF-1 LR3 overview

IGF-1 LR3 dosage by goal

Grouped by goal. Each protocol shows the amount, how often, cycle and rest as the source states them, with every titration step.

Injected10

Forum convention

Amount
20 to 40 mcg
How often
Once daily, after training
Route
Subcutaneous injection
Cycle
4 to 6 weeks on
Rest
Equal time off

Who: Forum protocols compiled in a 2026 peer-reviewed review

Timing: Post-workout, under the skin or into the muscle.

Self-logged doses

Amount
50 to 100 mcg
How often
Per logged entry; median bucket 50 to 100 mcg
Route
Subcutaneous injection

Who: 28 repeat reporters on a self-logging tracker; most common bucket 10 to 25 mcg

With a meal

Amount
20 to 40 mcg
How often
Once daily
Route
Subcutaneous injection
Cycle
4 to 6 weeks on
Rest
Equal time off

Timing: Within 20 minutes of a meal. The guide notes there is no report, study or convention to follow above 40 mcg.

Beginner

Amount
20 to 30 mcg
How often
Daily
Route
Subcutaneous injection
Cycle
4 weeks

Timing: 20 mcg in weeks 1 to 2, then 25 to 30 mcg in weeks 3 to 4.

Standard

Amount
30 to 40 mcg
How often
Daily, split across the day
Route
Subcutaneous injection
Cycle
4 to 6 weeks at most

Advanced

Amount
40 to 50 mcg
How often
Daily, split across the day
Route
Subcutaneous injection
Cycle
4 to 6 weeks at most

With fast carbs

Amount
20 to 40 mcg
How often
Daily; 20 mcg to start, 40 mcg a day in a 4 on, 4 off plan
Route
Subcutaneous injection
Cycle
4 to 6 weeks at most
Rest
2 to 4 weeks off

Timing: With 30 to 40 g of fast-digesting carbs within 30 minutes. Never fasted.

Site injection into a trained muscle (per side)

Amount
10 to 20 mcg
How often
After training, into each side of the trained muscle
Route
Intramuscular injection

Timing: Post-workout, bilateral.

Training days only

Amount
50 mcg
How often
After exercise on protocol days, 150 mcg a week
Route
Subcutaneous injection

Educational chart

Amount
20 to 50 mcg
How often
Daily
Route
Subcutaneous injection
Cycle
8 to 16 weeks, an outlier among guides

Timing: Morning or after training, with food.

Doses shown are what sources report, labelled by origin. Not medical advice.

Community-reported amounts

The IGF-1 LR3 amounts people mention most on Reddit, by goal. Counts, not recommendations.
IGF-1 LR3 amounts reported on Reddit, by goal, with mention counts
GoalMost reported amounts (mentions)
Muscle growth50 mcg (12), 30 mcg (8), 20 mcg (5), 100 mcg (5)
Goal not stated50 mcg (10), 20 mcg (5), 40 mcg (5), 100 mcg (4)
From 572 Reddit posts and comments, last mined Oct 23, 2026.

IGF-1 LR3 dosage chart by vial size

Units to draw for the doses sources cite most, at every vial size and water volume.
IGF-1 LR3: concentration and U-100 syringe units for each vial size and water volume
WaterStrength20 mcgdose, units40 mcgdose, units50 mcgdose, units
1 mg vial
1 mLCompetitor guide1 mg/mL20.02 mL40.04 mL50.05 mL
2 mLCompetitor guide0.5 mg/mL40.04 mL80.08 mL100.1 mL
3 mLCompetitor guide0.333 mg/mL60.06 mL120.12 mL150.15 mL
Units are on a U-100 insulin syringe (100 units = 1 mL). U-50 and U-30 barrels read the same units.Water volumes from

Doses shown are what sources report, labelled by origin. Not medical advice.

Calculate with this peptideYour vial, your water, your dose: IGF-1 LR3 in syringe units, with the math shown.

Mixing IGF-1 LR3

Diluent: Bacteriostatic water

Water volumes sources use: 1 mL, 2 mL, 3 mL

1 mg is the only vial size found. Doses are tiny, often 2 to 4 units on a U-100 syringe, so the volume you pick changes how precise each draw is. Guidance on acetic-acid reconstitution was not found.

IGF-1 LR3 dosage questions

How much IGF-1 LR3 per day?

20 to 40 mcg a day is the convention. Guides top out around 50 mcg. Self-logged entries run from about 10 to 100 mcg.

How much water goes in a 1 mg vial?

Guides use 1, 2 or 3 mL. At 1 mL, 20 mcg is 2 units on a U-100 syringe; at 2 mL it is 4 units. Use the calculator for your own numbers.

How long is a cycle?

4 to 6 weeks on, then the same time off. Some guides use 2 to 4 weeks off.

Sources for these doses

7 sources, each checked by date. Record updated Oct 23, 2026. Numbers are restated in our own words and labelled by where they came from.

Competitor guide5

  1. IGF-1 LR3 dosage chartPeptideDeck · checked Oct 23, 2026
  2. IGF-1 LR3 dosage protocolPeptidesExplorer · checked Oct 23, 2026
  3. IGF-1 LR3 dosage guideBodyHackGuide · checked Oct 23, 2026
  4. IGF-1 LR3 protocolPathToPeptides · checked Oct 23, 2026

Community-reported2

  1. Performance-enhancing peptides modulating GH-IGF1 axis (Dominikowski 2026)PMC · checked Oct 23, 2026
  2. IGF-1 LR3 (self-logged doses)PeptIQ · checked Oct 23, 2026

Back to the full IGF-1 LR3 page for side effects, storage, stacks and legal status.