TL;DR:
• GH = actual growth hormone, works regardless of pituitary function
• GH peptides = stimulate your own GH, depend on pituitary health
• GHRH (Tesamorelin, CJC) signal GH release
• GHRP (Ipamorelin) amplify GH pulses
• Older individuals generally respond better to GH than peptides

There’s a lot of confusion around growth hormone (GH) vs growth hormone peptides, so here’s a simple, no-nonsense breakdown.

What Is Growth Hormone (GH)?

GH is a hormone produced by the pituitary gland. It’s involved in:

• Muscle and tissue growth
• Fat metabolism
• Recovery and repair
• Bone density and aging-related processes

GH is administered as injectable recombinant human growth hormone (rhGH) meaning GH is supplied directly to the body.

What Are Growth Hormone Peptides?

GH peptides are not GH.
They work by stimulating the pituitary to release more of your own natural GH.

They fall into two main categories:

1. GHRH (Growth Hormone–Releasing Hormones)

These mimic the body’s natural GH-release signal.
Examples:

• Tesamorelin
• CJC-1295 (DAC or no DAC)

2. GHRP (Growth Hormone Releasing Peptides)

These trigger GH release through the ghrelin receptor.
Example:

• Ipamorelin

GHRH + GHRP are often stacked to create stronger GH pulses.

Injectable GH vs GH Peptides

Injectable GH:

• Delivers GH directly
• Does not rely on pituitary function
• Produces predictable, consistent GH levels

GH Peptides:

• Rely on pituitary responsiveness
• GH output varies person to person
• Effectiveness declines with age

GHRH vs GHRP (Quick Comparison)

GHRH:

• More physiological signaling
• Longer lasting stimulation

GHRP:

• Shorter GH spikes
• Amplifies pulse strength
• Works best paired with GHRH

Why Age Matters

As we get older, pituitary output declines.

That means:

• GH peptides often become less effective or inconsistent
• Injectable GH bypasses this limitation entirely

For older individuals, GH is typically the more reliable option, since it doesn’t depend on how active the pituitary gland still is.

- u/peptideguide_