Best Vitamin B1 (Thiamine)-Rich Foods for Guinea Pigs

Ranked by vitamin b1 (thiamine) content among foods safe for guinea pigs in the Creature Feast catalog.

Timothy Hay per 100g dry: ~0.3-0.5mg thiamine Timothy hay is a significant source of thiamine for guinea pigs. As the foundation of the diet, hay provides the bulk of daily thiamine intake. Thiamine is heat-sensitive and degrades over time, so always use fresh hay stored in a cool, dry place. Old, dusty hay loses thiamine content along with palatability.

Peas per 100g: ~0.27mg thiamine Peas are one of the richer vegetable sources of thiamine available to guinea pigs. A few fresh or thawed peas offered as a treat contribute meaningful B1 alongside their protein. Keep portions moderate due to the starch content — two to four peas per serving is sufficient.

Cauliflower per 100g raw: ~0.05mg thiamine Cauliflower provides modest thiamine along with Vitamin C and fiber. A small floret offered a few times per week adds to B1 intake. Like broccoli, cauliflower can cause gas in some guinea pigs, so introduce it gradually.

Romaine Lettuce per 100g: ~0.07mg thiamine Romaine lettuce provides small amounts of thiamine as part of its broad nutritional profile. While not a concentrated source, romaine's daily presence in the diet means it contributes a steady trickle of B1. Guinea pigs also receive thiamine from cecal bacteria via coprophagy.