Is it possible I have a stronger corrugator muscle on one side pulling my single vertical frown line? Is Botox right?

muscules can be independent. so yes you need a customized approach and botox with at home dermarolling and peels (see link) and inoffice lasers are best.

at home peels like cosmelan, enlighten and aerify along with dermarolling (EmerageSkin roller with anteage AERIFY MD ampules weekly, see link) should be started now to prevent further aging.

For facial rejuvenation, I would suggest a combination approach of
1) skin care with products and PRP/microneedling
2) PDT light therapy few times a month with growth factors
3) laser treatments like clear and brilliant regularly and a few times a year Fraxel/halo Viva, Co2/Erbium
4) Sculptra injections a few times a year for collagen production with fillers like juvederm/restylane/belotero/radiesse/bellafill
5) thermage/ultherapy for yearly skin tightening with or without PDO or cone based instalift threads for lifting
6) botox every 2-3 months to stop movement lines and prevent lines at rest
7) deep microneedling RF like Fractora/morpheus8 for tightening of the skin
8) Vascular laser like vbeam/excel V or BBL forever young treatment every quarter (3-4 months)

Best, Dr. Emer.

Thank you for sharing your question. Yes it is possible to have asymmetric muscle function leading to differences in crease formation. This would be treated with a higher dosing of Botox on that side and perhaps some dermal filler to improve the skins condition in that frown.