If you mean fruits that support your body’s collagen production and joint health, two useful choices are:
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Guava — very high in vitamin C, which is required for collagen synthesis.
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Kiwi — also rich in vitamin C and provides antioxidants that support connective-tissue health.
Important: No fruit has been shown to regenerate lost knee cartilage or collagen by itself. Vitamin C supports collagen formation, but rebuilding damaged knee cartilage is much more complicated.
Other vitamin-C-rich options include oranges, strawberries, papaya, and bell peppers.
