The ingredients used in the Hair improvement Protocol pose minimal risk of side effects.
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Erythema (redness of the skin) is the most common side effect associated with topical application of latanoprost. ¹
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Side effects associated with minoxidil use are rare but include dryness, itching, scaling, flaking, and redness. ²
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1. Blume-Peytavi U, Lönnfors S, Hillmann K, Garcia Bartels N. A randomized double-blind placebo-controlled pilot study to assess the efficacy of a 24-week topical treatment by latanoprost 0.1% on hair growth and pigmentation in healthy volunteers with androgenetic alopecia. J Am Acad Dermatol. 2012 May;66(5):794-800. doi: 10.1016/j.jaad.2011.05.026. Epub 2011 Aug 27. PMID: 21875758.
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2. Suchonwanit P, Thammarucha S, Leerunyakul K. Minoxidil and its use in hair disorders: a review. Drug Des Devel Ther. 2019 Aug 9;13:2777-2786. doi: 10.2147/DDDT.S214907. Erratum in: Drug Des Devel Ther. 2020 Feb 10;14:575. PMID: 31496654; PMCID: PMC6691938.