This study builds on a pilot study that investigated the impact of Mindfulness Training for Primary Care on anxiety, depression, stress, and chronic illness self-management in primary care patients receiving care in an urban, community, multi-cultural safety net healthcare system. The current comparative effectiveness randomized controlled trial takes place in a larger sample, and investigates the impact of a refined MTPC curriculum on specific aspects of self-regulation such as action plan initiation, while examining potential mechanisms of change, including self-efficacy, perceived control, mindfulness, self-compassion, emotion regulation, and body awareness. Participants randomized to MTPC are compared with participants who are randomized to a low-dose comparator condition and receive a 1-hour introduction to mindfulness with a referral to community mindfulness resources. Outcome assessments are conducted at baseline and study weeks 8-10.