Peptides for Strength vs Mass: Which Goal Wins (2026)

Strength-Dominant Stacks (Powerlifting/Strength Athletes)

IGF-1 LR3 for Site-Specific Hypertrophy

IGF-1 LR3, 4-6 weeks, post-workout, injected near target muscle.

IGF-1 LR3 is the strongest direct anabolic tool in the peptide world. It binds IGF-1 receptors with extended half-life compared to native IGF-1 and concentrates locally when injected near target tissue. Advanced strength users run short cycles (4-6 weeks maximum) focused on bringing up weak points.

Why it's in the strength tier: site-specific fiber hypertrophy supports force output in lagging muscles more precisely than systemic GH elevation. The lifter who can't lock out a deadlift doesn't need more fat loss — they need thicker spinal erectors, and IGF-1 LR3 injected intramuscularly in that area is one way to get there.

Trade-offs: hypoglycemia risk (cross-reactivity with insulin receptor at high doses), short cycle length required (receptor desensitization), mandatory bloodwork.

Protocol: 20-50 mcg post-workout, intramuscular near target muscle, 4-6 days per week. Fast-acting carbs on hand.

Deep dive: Best IGF-1 LR3 Vendors | IGF-1 LR3 Dosing Guide

Top IGF-1 LR3 Vendors

Ranked by price, COA availability, and reputation

Follistatin-344 for Myostatin Inhibition

Follistatin-344, 4 weeks, adjunct on top of a GHRH+GHRP base.

Follistatin binds and neutralizes myostatin — the protein that actively limits muscle growth. The Kota 2009 nonhuman primate study showed follistatin gene delivery produced durable muscle size and strength increases. Human data for peptide injection is limited.

Why it's in the strength tier: myostatin inhibition tends to produce disproportionate strength gains relative to mass gains in animal models. Double-muscled cattle (Belgian Blue) have the same pattern — much more muscle + more force, less fat.

Protocol: 100 mcg follistatin-344 daily for 4 weeks, subcutaneous, stacked on top of CJC+ipa or tesa+ipa. Experimental.

Deep dive: Follistatin-344 Dosing Guide

BPC-157 for Tendon and Connective Tissue

BPC-157, 4-8 weeks, subcutaneous or localized near injury.

BPC-157's strength angle isn't direct hypertrophy — it's connective tissue integrity. For powerlifters accumulating tendon/ligament wear from repeated heavy lifting, BPC-157 accelerates repair and supports higher training volumes before breakdown. A strength lifter who can train 4x/week instead of 3x/week because their elbows don't hurt will produce more strength gains over time than any direct anabolic peptide at the same dose.

Protocol: 250-500 mcg subcutaneous, twice daily, localized near any problem joint or tendon.

Deep dive: Best BPC-157 Vendors | BPC-157 Dosing Guide

Top BPC-157 Vendors

TB-500 for Systemic Recovery

TB-500, 4-6 weeks, subcutaneous.

Pairs with BPC-157 for a broader repair stack. Good for powerlifters dealing with accumulated multi-site wear (shoulders, lower back, knees all cranky at once).

Deep dive: Best TB-500 Vendors | TB-500 Dosing Guide

Top TB-500 Vendors

The Hybrid Stacks (Both Goals)

Powerlifter Wanting Hypertrophy

Base: CJC-1295 + ipamorelin, 100 mcg + 100 mcg pre-bed, 12-16 weeks

Add weeks 8-12: IGF-1 LR3 30 mcg post-workout, 4 days/week

Add as needed: BPC-157 for sore joints

Expected outcome: 3-5 lb lean mass, modest strength gains, better training frequency.

Bodybuilder Wanting Strength

Base: Tesamorelin + ipamorelin, 2 mg + 100-200 mcg pre-bed, 12-16 weeks

Add weeks 4-8: Follistatin-344 100 mcg daily for 4 weeks

Continuous: BPC-157 250 mcg twice daily for training volume support

Expected outcome: 4-5 lb lean mass, visible physique transformation, meaningful strength signal on major lifts.

Training Matches the Peptide

For mass (bodybuilding-leaning):

4-6 sessions per week

10-20 working sets per muscle group per week

Rep ranges of 6-15

Moderate intensity (65-85% 1RM)

Short-to-medium rest intervals (60-120 sec)

For strength (powerlifting-leaning):

3-5 sessions per week

Fewer total sets, higher intensity

Rep ranges of 1-5

High intensity (85-95% 1RM)

Long rest intervals (3-5 min)

Running a mass-focused peptide stack with strength-focused training still works, but you'll leave gains on the table. Match the stack to the training.

Bloodwork

Both tiers: baseline IGF-1, fasting glucose, HbA1c, CMP, lipid panel.

Mass stacks: standard 4-week IGF-1 check, 12-week full panel.

Strength stacks with IGF-1 LR3: more frequent glucose monitoring (weekly fasting glucose during active IGF-1 LR3 use). Fast-acting carbs on hand every training session.

Related Reading

Best Peptides for Muscle Growth — anchor ranking

Best Peptides for Bulking — mass-focused protocols

Best Peptides for Post-Workout Recovery — training volume support

Peptides vs SARMs vs Steroids — cross-category comparison

Peptide Muscle Timeline — expectations by stack

IGF-1 LR3 Dosing Guide — protocol detail

Follistatin-344 Dosing Guide — protocol detail

References

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Falutz J, et al. Effects of tesamorelin in HIV-infected patients with abdominal fat accumulation. J Clin Endocrinol Metab. 2010;95(9):4291-4304.

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Adrian S, et al. Tesamorelin decreases muscle fat and increases muscle area in adults with HIV. J Frailty Aging. 2019;8(3):154-159.

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Nass R, et al. Effects of an oral ghrelin mimetic on body composition in healthy older adults. Ann Intern Med. 2008;149(9):601-611.

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Kota J, et al. Follistatin gene delivery enhances muscle growth and strength in nonhuman primates. Sci Transl Med. 2009;1(6):6ra15.

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Pandya N, et al. GHRP-6 requires endogenous hypothalamic GHRH for maximal GH stimulation. J Clin Endocrinol Metab. 1998;83(4):1186-1189.

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