This will be a small study aimed at determining the effects of oral Immulina consumption on the immune system in elderly individuals.

Inclusion Criteria:

• Age 60 and older;
• Generally otherwise healthy for age and not taking medications/supplements that could be expected to affect stress responses and/or impact immune parameters (example - systemic steroids, beta blockers, antidepressants, anti-anxiety drugs, Echinacea supplements, ginseng supplements or Spirulina supplements).

Exclusion Criteria:

• Inability to comprehend and speak English;
• Any history of major psychological or psychiatric illness (example - dementia, psychotic disorder, acute mania, current substance abuse) that may limit participant cooperation or compromise the integrity of self-reported clinical or psychological data;
• Presence of a confounding underlying systemic illness which could interfere with immunological profiles (example - severe cardiovascular, pulmonary, hepatic, gastrointestinal, renal, neurological, musculoskeletal endocrine , or metabolic systems; other gross physical impairments; or any history of significant convulsive disorder). Specifically, patients with congestive heart failure, recent viral or bacterial illness in the past 3 weeks, chronic kidney disease, thyroid disorder, autoimmune disease will be excluded.