Why not just take a B12 pill?

Oral absorption requires intrinsic factor and a healthy gut — both of which often decline with age, medications, or H. pylori. Injections bypass all of that.

Can I overdose on B12?

No clinically meaningful upper limit exists. Excess is excreted in urine.

If you were deficient, you'll notice steadier energy, sharper focus, and better mood within days.

Energy at the Cellular Level

Vitamin B12 Injections

Vitamin B12 is essential for energy production, red blood cell formation, and nervous-system health — but oral absorption falls off sharply with age, gut issues, and certain medications. A weekly intramuscular B12 injection bypasses the gut entirely, delivering 100% bioavailable methylcobalamin straight into circulation.

Part ofPeptides & Vitamin Injections

How it works

The mechanism

B12 is a cofactor in the methylation cycle and in mitochondrial energy production. We use methylcobalamin (the active form) rather than cyanocobalamin so your body can use it immediately. A single injection saturates tissues and stays clinically active for 5–10 days.

Who it's for

Best candidates

Men with low energy or chronic fatigue
Vegetarians, vegans, and patients on metformin or PPIs
Men over 40 noticing slower recovery and brain fog
Patients with confirmed low or low-normal B12 on bloodwork

Protocol

1,000 mcg methylcobalamin IM once weekly for the first 4 weeks, then weekly or bi-weekly maintenance. Bloodwork at baseline and 8 weeks.

Timeline

Energy and mood often improve within the first 1–2 injections. Anyone with frank deficiency feels the change quickly.

What to expect

Side effects & considerations

Essentially none at therapeutic doses. Minor injection-site soreness. B12 is water-soluble so excess is excreted.

Frequently asked