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The amount depends on your target concentration
Topical vs injectable effectiveness Injectable advantages: Systemic effects throughout body Higher bioavailability (80-90%) Works on skin from inside Benefits hair, nails, internal tissues More powerful overall Topical advantages: No needles required Easy daily application Targeted to specific areas Good for facial skin focus Can apply to larger areas Which is better: Injectable: More comprehensive, powerful Topical: Easier, good facial results Best: Both together (synergistic) Cost comparison (50mg vial): Injectable: $80-150 vial, 5-8 weeks Topical: $80-150 vial, 30 days application Injectable more cost-effective per day Combining GHK-Cu with other peptides and treatments Synergistic protocols for maximum results
For adults 60+, and especially anyone with reduced stomach acid, atrophic gastritis, post-bariatric surgery, or on metformin/PPIs, sublingual is the lower-risk default because at least some of the dose absorbs through the oral mucosa directly, bypassing the stomach
Moreover, theres increasingly more evidence linking vitamin B12 deficiencies to brain, heart, inflammatory, and immune system disorders (4)
You take Vitamin B12 injections at home as prescribed by your doctor if: You have a vitamin B12 deficiency
