Which later scientific ideas of Linus Pauling received criticism from other scientists?

While Linus Pauling is celebrated for his foundational work in chemistry, several of his later scientific theories faced significant skepticism and rejection from the broader scientific and medical communities.1

These controversial ideas included:

• Orthomolecular Medicine: Pauling proposed that mental health and physical well-being could be improved by manipulating substances naturally present in the body, specifically through the use of "megadoses" of vitamin C. His claims regarding the efficacy of vitamin C in treating the common cold and cancer were rejected by the medical establishment, as clinical investigations—such as those conducted at the Mayo Clinic—failed to corroborate his findings.21
• Physics Models: Pauling’s proposed cluster model of the atomic nucleus was rejected by physicists, and his interpretations regarding the nature of quasicrystals received little support from the scientific community.1

Despite these later controversies, Pauling remained a highly influential figure, recognized for his earlier scientific achievements and his dedicated humanitarian efforts, including his advocacy for nuclear disarmament.21