π 1. Injections (Subcutaneous or Intramuscular)
This is the most effective and common method, especially for therapeutic or performance-enhancing peptides.
How it works:
- Peptides are injected under the skin (subcutaneous) or into the muscle (intramuscular).
- This bypasses the digestive system, so the peptide enters the bloodstream directly and stays active longer.
Pros:
- πͺ High bioavailability (your body absorbs it well)
- β± Fast-acting
- π― Precise dosing
Cons:
- π©Ή Requires needles and proper technique
- π§ Often needs refrigeration
- π§ββοΈ May require medical supervision
π 2. Oral Peptides (Capsules or Tablets)
Some peptides are designed to survive digestion and be absorbed through the gut.
How it works:
- You swallow a pill, and the peptide is absorbed through the intestinal lining.
- Only certain peptides are stable enough to work this way.
Pros:
- π«Ά Easy and convenient
- π§³ Travel-friendly
Cons:
- π§ͺ Lower bioavailability (many peptides break down in the stomach)
- 𧬠Limited to specific types
πΏ 3. Topical Peptides (Creams, Serums, Sprays)
Used mostly in cosmetic and skincare products.
How it works:
- Peptides are absorbed through the skin to target surface-level issues like wrinkles, dryness, or inflammation.
Pros:
- π§ββοΈ Non-invasive
- π Great for skin health
Cons:
- 𧬠Limited penetration (wonβt affect deeper tissues or systemic functions)
- π§΄ Mostly cosmetic, not therapeutic
π§ͺ 4. Nasal Sprays
Some peptides can be absorbed through the nasal mucosa.
How it works:
- You spray the peptide into your nose, and it enters the bloodstream or brain through the nasal lining.
Pros:
- π§ Good for brain-targeted peptides
- π« Fast absorption
Cons:
- 𧬠Not all peptides work this way
- π Can irritate nasal passages


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