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Oral vitamin C is limited by intestinal transporters, so plasma levels plateau even when doses increase
Bypasses digestive absorption issues
As noted previously, in humans, dietary carnosine is absorbed intact by the small intestine into the portal circulation, but is rapidly hydrolyzed by serum carnosinase in plasma into -alanine and histidine
Once opened, refrigerate all three products for best taste and freshness.
Simple ways to keep skin healthy: Eat a balanced diet: Include fruits, vegetables, whole grains, nuts, and lean protein
Evidence snapshot: The strongest human evidence comes from a 2-year randomized controlled trial in 65 healthy older adults (Nass et al., 2008, Annals of Internal Medicine) showing sustained GH/IGF-1 increases and preserved fat-free mass, plus an earlier short-term human polysomnography study on sleep (Copinschi et al., 1997, Neuroendocrinology, PMID 9349662)
