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Hair loss on a GLP-1: why it happens, and what helps.

The shedding that shows up a few months into rapid weight loss has a name and a pattern. Knowing both tells you what to do, and what to skip.

APLOMB GLP-1 Resource ยท Reviewed by Zachary Poll, Founder

Why is my hair shedding on a GLP-1?

Rapid weight loss and reduced eating push a larger share of hair follicles out of their growing phase and into the resting and shedding phase, a pattern called telogen effluvium. It typically appears two to four months after the change, which is why the shedding often starts well after the medication does.

The trigger is the rapid loss itself, not the drug acting on the hair directly. Any sharp drop in intake, after surgery, after illness, after crash dieting, can do the same thing. Eating much less also tends to lower iron, zinc, and vitamin D, and those shortfalls give the shedding more to feed on.

Is it permanent?

Telogen effluvium is a shift in timing, not a loss of follicles, so the hair is shedding early rather than gone for good. But the nutrient gaps common during rapid weight loss can prolong the shedding and thin the regrowth, which is the part worth acting on.

So the honest framing is neither panic nor "ignore it." The pattern is usually self-limited, but how quickly and how fully hair recovers depends a great deal on whether the underlying deficits are corrected while the body is under the stress of rapid loss.

What actually helps?

Correcting the iron, zinc, and vitamin D shortfalls that are common during reduced eating is the highest-value step, alongside adequate protein. That is what the follicle needs to move back into its growing phase.

APLOMB. Roots is built for exactly this window. It is a three-capsule daily of ferrous bisglycinate iron, vitamin D3, zinc picolinate, and saw palmetto, the nutrients with the clearest links to shedding in this pattern, dosed for the months when intake is lowest.

Why there is no biotin in it Biotin is the reflexive "hair vitamin," but there is no good trial evidence that it helps shedding in people who are not biotin-deficient, and deficiency is rare. More important, high-dose biotin interferes with common lab assays, including troponin (used to diagnose heart attacks) and thyroid tests, which the FDA has warned about. Roots leaves it out on purpose.
What this will not do Roots supports the temporary shedding that follows rapid weight loss. It will not regrow hair lost to genetic, androgenetic hair loss, which is a different mechanism addressed by treatments like minoxidil or finasteride. If shedding is heavy or has not eased after the weight has stabilized, see a dermatologist.

Citations

  1. Guo EL, Katta R. Diet and hair loss: effects of nutrient deficiency and supplement use. Dermatology Practical & Conceptual, 2017. PubMed 28243487
  2. US Food and Drug Administration. Safety Communication: Biotin (vitamin B7) may interfere with certain lab tests, including troponin and thyroid assays, 2019.
  3. Wilding JPH, Batterham RL, Calanna S, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1). New England Journal of Medicine, 2021. NEJM full text

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Editorial content, not medical advice. APLOMB. Roots is a dietary supplement; these statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results vary. APLOMB is not affiliated with, endorsed by, or sponsored by the makers of any GLP-1 medication; brand names are used for informational purposes only. Talk to a clinician about heavy or persistent shedding.