02/27/2026
Fatigue and hair thinning in perimenopause?
Sometimes the issue isn’t hormones — it’s B12 absorption.
During perimenopause, many women are eating enough B12…but absorbing less of it.
Why?
Hormonal transitions can affect:
• Stomach acid production
• GI motility
• Intrinsic factor function
• Underlying autoimmune or inflammatory patterns
And B12 absorption quietly suffers.
🧬 Why this matters:
• B12 is essential for mitochondrial energy
• It supports red blood cell production and oxygen delivery
• It’s critical for nervous system and cognitive function
• Hair follicles are highly energy-dependent — low B12 can contribute to diffuse shedding and slow regrowth
💉 Why hydroxocobalamin injections help…
Injections bypass the gut entirely, making them effective when absorption is impaired.
Hydroxocobalamin is also:
• Longer-lasting in tissues
• Converted into active B12 forms as needed
• Often better tolerated than methyl-B12 in women with anxiety, sleep disruption, or stress sensitivity
📌 Bottom line:
In perimenopause, fatigue and hair loss aren’t always “just hormones” (but sometimes hormones, especially thyroid, are involved).
Sometimes these symptoms are a nutrient delivery problem — not an intake problem.