Seasonal Affective Support
About this protocol
Where to start
Start light therapy first. 10,000-lux light box for 30 minutes within the first hour of waking. This is the most-evidenced treatment for SAD with effect sizes comparable to SSRIs. Quality light boxes cost $50-150; some insurance reimburses.
Vitamin D3 at HIGHER doses than the general protocol — 4000-5000 IU daily through winter. Most adults in higher latitudes drop to deficient range by January. Test 25-OH vitamin D in October; target 40-60 ng/mL for mood.
Omega-3 EPA-dominant at 2 g daily. Supports mood and cognitive function.
Saffron at 30 mg daily for the dedicated mood support. Multiple trials in mild-to-moderate depression support effect.
5-HTP at 100-200 mg in the evening if dominant symptoms are carb-cravings, weight gain, and oversleeping (the "atypical" SAD pattern). Do NOT combine with SSRIs or MAOIs.
Start protocol in October, taper in March. Don''t use 5-HTP and saffron year-round — restart for the next winter season.
If preventive use the year before reduced symptoms, repeat. If symptoms reach functional impairment despite stack + lifestyle, see a doctor.
4 nutrients
Start here
Strongest evidence — the foundation of the stack.
Vitamin D3 (Winter High-Dose)
4000-5000 IU daily through winter (October-March), with breakfastVitamin D status drops dramatically in higher-latitude winters due to reduced UVB exposure. Low vitamin D correlates with seasonal depression severity. Higher winter doses (4000-5000 IU) than the general protocol (2000-4000 IU) are appropriate for SAD-prone adults. Target 25-OH vitamin D 40-60 ng/mL. Pair with K2 for cardiovascular safety.[1, 2, 3]
Omega-3 (EPA-dominant)
2 g combined EPA+DHA (with at least 60% EPA), with breakfastOmega-3 EPA has consistent meta-analytic support for depression endpoints. Particularly relevant for SAD where serotonin pathway disruption is part of the mechanism.[4, 5]
Add if needed
Add these only if the foundation isn't enough.
Saffron (Crocus sativus)
30 mg standardized extract daily, October through MarchSaffron has trial evidence in mild-to-moderate depression comparable to fluoxetine. Use seasonally — don''t take year-round. Use a standardized extract (Affron brand).[6, 7, 8]
Experimental
Emerging evidence — try last, only if curious.
5-HTP
100-200 mg in the evening, only for atypical SAD pattern (carb cravings, weight gain, hypersomnia)5-Hydroxytryptophan is a serotonin precursor. Particularly useful for atypical SAD presentations dominated by carbohydrate cravings, weight gain, and oversleeping. CRITICAL: do NOT combine with SSRIs, SNRIs, MAOIs, or tryptophan supplements — serotonin syndrome risk. Take in the evening for the serotonin-to-melatonin conversion benefit.[9, 10]
Warnings
Lifestyle improvements
Bright light therapy is the gold standard for SAD
10,000-lux light box for 30 minutes within the first hour of waking. The most-evidenced SAD treatment with effect sizes comparable to SSRIs. Quality light boxes (Verilux, Northern Light Technologies, Carex) cost $50-150. Some insurance reimburses.
Time the light therapy correctly
Morning light therapy (within 1 hour of waking) is the right timing for typical SAD (early-morning awakening, fatigue, low mood pattern). Evening light therapy for delayed sleep phase pattern. Position the light box 16-24 inches away with eyes open but not staring directly.
Start preventively
If you''re SAD-prone, start the protocol in September-October BEFORE symptoms hit. Treating early is dramatically easier than treating once you''re in a depressive episode.
Get outdoor light when available
Even cold winter daylight provides far more lux than indoor lighting. 15-30 minutes outdoors in midday — even on cloudy days — helps circadian rhythm.
Aerobic exercise in the morning
Morning aerobic exercise compounds with light therapy for SAD outcomes. Even outdoor walks in cold weather are excellent.
Sleep regularity
SAD is partly a circadian phase disorder. Consistent sleep timing (same bed and wake times) supports the system more than just total sleep duration.
Address carb cravings without judgment
Atypical SAD includes carb cravings — these aren''t willpower failures, they''re serotonin signaling. The stack (especially 5-HTP if appropriate) addresses the underlying signal.
Vitamin D status check in October
Get 25-OH vitamin D measured in early fall to know your starting point. Many SAD-prone adults arrive at winter already deficient.
Plan for winter
Schedule social activities, exercise, exposure to natural light, and planned vacations to higher-light locations if affordable. Don''t hibernate — that amplifies SAD.
Consider SSRIs if appropriate
For severe SAD that has caused major functional impairment in prior winters, prophylactic SSRI started in October (and continued through March) has trial evidence. Discuss with your doctor if light therapy + supplements haven''t been enough.
Move to lower latitude if possible
For some people with severe recurrent SAD, geographic relocation is a real consideration. Even shorter winter trips to lower latitudes provide meaningful relief.
References
- Vitamin D — supplement research overviewExamine.com link
- Anglin RES, et al. Vitamin D deficiency and depression in adults: systematic review and meta-analysis. Br J Psychiatry. 2013;202:100-107.PubMed link
- Spedding S. Vitamin D and depression: a systematic review and meta-analysis. Nutrients. 2014;6(4):1501-1518.PubMed link
- Fish oil — supplement research overviewExamine.com link
- Sublette ME, et al. Meta-analysis of the effects of eicosapentaenoic acid (EPA) in clinical trials in depression. J Clin Psychiatry. 2011;72(12):1577-1584.PubMed link
- Saffron — supplement research overviewExamine.com link
- Lopresti AL, et al. Affron, a standardised extract from saffron for the treatment of youth anxiety and depressive symptoms. J Affect Disord. 2018;232:349-357.PubMed link
- Marx W, et al. Effect of saffron supplementation on symptoms of depression and anxiety: a systematic review and meta-analysis. Nutr Rev. 2019;77(8):557-571.PubMed link
- 5-HTP — supplement research overviewExamine.com link
- Shaw K, et al. Tryptophan and 5-Hydroxytryptophan for depression. Cochrane Database Syst Rev. 2002;(1):CD003198.PubMed link
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medication· 1 shared ingredient
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medication· 1 shared ingredient
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beauty· 1 shared ingredient
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focus· 1 shared ingredient
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Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This protocol is educational, not a substitute for personalized medical advice. Talk to your doctor before starting any new supplement regimen — especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition. Last updated 5/20/2026.