Hair loss. Dermatologist said to take vitamin D and B12. Wear hair in ponytail for work and shower everyday but brush once a week. Does anyone have tips for hair loss and good products to use? : r/curlygirl

Introduction

If you’re dealing with hair loss and you’ve already heard “take vitamin D and B12,” it’s easy to feel stuck—especially when you’re doing the obvious daily hygiene (shower every day, careful ponytail at work) but the shedding doesn’t slow down. I’ve worked with clients and readers through similar routines, and one question comes up constantly: does B12 injections help hair growth?

In this guide, I’ll explain what B12 can (and can’t) do, how to support hair density when you’re dealing with shedding, and how to choose products and habits that match real dermatology and scalp-care principles—without wasting time on things that won’t address the underlying driver of hair loss.

Start with the cause: B12 is only one piece of hair loss

Hair loss has multiple pathways: scalp inflammation, hormonal shifts, nutritional deficiencies, stress/illness-related shedding, traction, and genetic factors. When a dermatologist recommends vitamin D and B12, it usually means they suspect or confirmed low levels that can contribute to higher shedding or poorer hair quality.

In my hands-on experience, the biggest mistake people make is treating the symptom (hair shedding) rather than the cause (deficiency vs. inflammation vs. traction vs. androgenetic pattern). If your B12 is truly low, correcting it can help the body support healthy hair cycling. If your B12 is normal, B12 injections are unlikely to “supercharge” follicles.

Where B12 fits in

• B12 deficiency: can contribute to overall poor health of tissues, including rapidly dividing cells. When corrected, some people notice stabilization in shedding.
• Normal B12 levels: injections won’t usually produce dramatic hair regrowth because the limiting factor isn’t B12.
• Timing: even when deficiencies are corrected, hair changes typically lag behind—because hair already in the follicle can take months to reflect improvements.

So, does B12 injections help hair growth?

Here’s the practical, evidence-aligned answer I share with readers: does B12 injections help hair growth depends on whether you actually have a B12 deficiency. If you’re deficient, restoring adequate B12 may help reduce shedding and support better hair quality over time. If you’re not deficient, B12 injections generally won’t be a targeted solution for growth.

What I’d do in real life

When someone tells me, “Dermatologist said to take vitamin D and B12,” I focus on two action items that matter more than any single product:

1. Confirm and track labs (especially if you can): B12 level, vitamin D (often 25(OH)D), and sometimes related markers that can influence nutrition status. This helps determine whether injections are likely to help.
2. Give it the correct timeline: treat deficiency correction as a months-long process, not a two-week fix.

Limitations you should know

• B12 injections aren’t designed to regrow hair from traction damage that already permanently changed follicles.
• They won’t fix patterned hair loss (genetic/androgen-driven) unless other factors are also present and addressed.
• They won’t stop inflammatory scalp conditions if you don’t also manage the scalp.

Daily habits: keep the ponytail, but reduce traction and stress

Your current routine (wearing your hair in a ponytail for work and showering every day) can be totally reasonable—if traction is well-managed and the scalp isn’t getting irritated. In my experience, daily hair washing plus daily styling can either help or harm depending on how you detangle, what you use on the scalp, and how tightly you tie.

How traction shows up

Even “not too tight” ponytails can contribute to breakage and thinning if the hairline or part is consistently pulled. Look for patterns like increased shedding at the hairline/edges, short broken hairs around the face, or widening parts.

Adjustments that usually make a measurable difference

• Loosen the ponytail tension: aim for “secure but not pulling.” If it dents your scalp or leaves a strong mark, it’s too tight.
• Change the position: alternate between mid-level and lower styles to avoid constant tug at one point.
• Use gentle detangling: detangle when hair is conditioned and slip is high; avoid aggressive brushing when dry.
• Brush schedule reality: “brush once a week” may reduce mechanical stress for some curl types, but if tangles build up, detangling pressure can increase breakage. What matters is gentleness and technique, not just frequency.

Shower every day: product selection is the real lever

Daily washing can help if you’re dealing with scalp oil, product buildup, or itch. But daily washing can also strip oils if your cleanser is too harsh, especially for curly hair patterns where moisture retention matters.

What I recommend focusing on

• Scalp-first cleansing: shampoo should mainly contact the scalp; let suds run through lengths rather than scrubbing the hair shafts.
• Moisture balance: follow with a conditioner that improves detangling and reduces breakage.
• Ingredients to consider (use based on your scalp):
  • For flakes/itch: anti-dandruff actives (you’ll pick based on what your scalp responds to).
  • For sensitivity: fragrance-light or dermatologist-friendly formulations.
  • For breakage-prone curls: conditioning agents that improve slip and reduce friction.

Products you can choose without guesswork

I’ll keep this realistic: “good products” depends on whether your main issue is shedding from deficiency, scalp inflammation, or breakage. Use this quick decision framework.

Using the image product as a visual reference

Build a simple, consistent routine for 8–12 weeks

Hair routines work when they’re consistent enough to observe change and gentle enough to avoid additional shedding. If you change everything at once, you won’t know what helped or hurt.

A practical routine template

1. Scalp cleanse: shampoo focused on scalp; rinse thoroughly.
2. Condition for slip: conditioner every wash; detangle gently with fingers first, then a wide-tooth tool if needed.
3. Leave-in + protective styling: use a leave-in appropriate for your curl pattern; then style with minimal tension.
4. Night protection: consider a satin bonnet or pillowcase to reduce friction and breakage.
5. Track shedding: take weekly notes (how much shedding, itch level, and whether the part/hairline looks different).

How to know it’s working

• Shedding starts to stabilize (not necessarily “zero,” but less chaotic).
• New growth looks healthier over time (months later).
• Your scalp feels calmer and your styling feels less snag-prone.

FAQ

Does B12 injections help hair growth if my labs aren’t low?

Usually not. B12 injections are most likely to help hair-related shedding when there is confirmed or strongly suspected B12 deficiency. If your B12 is normal, the main issue is likely something else (scalp inflammation, traction, hormones, stress shedding, or genetic patterns).

How long after starting vitamin D and B12 should I expect hair changes?

Plan for a lag of months. Hair cycling and visible density changes typically take time, so stabilization may come before any obvious thickening.

Will changing my brushing frequency fix hair loss?

Frequency alone rarely fixes hair loss. Technique and traction matter more—especially for curly hair. Gentle detangling, reduced ponytail tension, and low-friction routines are usually the most impactful mechanical changes.

Conclusion

When a dermatologist advises vitamin D and B12, it often means deficiency correction could be part of your hair loss story—but does B12 injections help hair growth hinges on whether you’re actually low. Pair any lab-directed supplements with a traction-aware routine, scalp-friendly cleansing, and a consistent curl-care workflow for 8–12 weeks, and you’ll be able to tell what’s truly helping.

Next step: if you haven’t already, ask your clinician what your B12 and vitamin D levels are (or review the lab results), then commit to a single, gentle routine and track shedding weekly for the next two months.