Hyaluronic Acid Supplement: Benefits, Dosage and Does It Work?
Do hyaluronic acid supplements work? Clinical trial results for skin hydration, the best dosage, side effects, and oral vs topical HA.
The clocks go back, it’s dark by 5 p.m., and suddenly getting out of bed feels harder. You want to sleep more, crave carbs and feel flat in a way that lifts again in spring. If that sounds familiar, you’re far from alone, and it’s natural to wonder which vitamins for seasonal depression and the winter blues are actually worth taking.
This guide covers what the research says about vitamin D, omega-3, B vitamins, magnesium and rhodiola for winter mood, what works better than any supplement, and how to choose a winter mood supplement if you decide to try one.
Most people feel a little lower in winter. For some, it goes further. A 2025 meta-analysis of 24 studies and nearly 33,000 people found that about 5% of people have seasonal affective disorder (SAD), a form of depression that returns each winter, and another 9.4% have a milder “subsyndromal” form, often called the winter blues. Both became more common the further people lived from the equator (Kim et al., 2025).
Typical signs include low mood most days, oversleeping, low energy, carbohydrate cravings, weight gain and pulling away from people, starting in autumn and easing in spring.
Seasonal affective disorder is a real medical condition, and supplements are not a treatment for it. Please see a doctor if low mood lasts more than two weeks, stops you working or socializing, or comes with hopelessness or thoughts of self-harm. In the US you can call or text 988 any time to reach the Suicide & Crisis Lifeline.
Winter-pattern mood changes are driven largely by less daylight, so light is the most direct fix. A meta-analysis of 19 randomized trials found that bright light therapy (a light box of at least 1,000 lux, usually 10,000 lux for 20 to 30 minutes each morning) significantly reduced depression scores in seasonal affective disorder compared with placebo (Pjrek et al., 2020). Even without a light box, a 20-minute walk outside in the morning helps. Learn more in morning light for better sleep.
Supplements work best as support alongside light, movement, sleep and social contact, not as a replacement for them.
Your skin makes vitamin D from UVB sunlight, but in winter the sun sits too low in the sky. A classic study in Boston (about 42°N) found that from November through February, sunlight produced no measurable vitamin D in the skin at all (Webb et al., 1988), and population studies show blood levels fall through the darker months (O’Neill et al., 2016). That’s roughly everywhere north of Los Angeles.
Here’s the honest part: in the large VITAL trial, 2,000 IU of vitamin D a day for five years didn’t prevent depression in adults over 50 who weren’t depressed to begin with (Okereke et al., 2020). Vitamin D isn’t a mood pill. Its real job in winter is keeping your levels from dropping, which supports your immune system, muscles and bones, and it’s most worth taking if you’re low. For more on vitamin D and energy, see our guide to the best vitamins for tiredness.
Omega-3 fats from fish are part of every brain cell membrane. A 2025 meta-analysis of 36 randomized trials found that omega-3 supplements produced a small but significant improvement in depressive symptoms, with the best results at 1,000 to 1,500 mg a day taken for more than eight weeks (Kong et al., 2025). Omega-3 also didn’t prevent depression in VITAL’s healthy older adults (Okereke et al., 2021), so its benefit seems to show up mainly in people whose mood is already low. Read more in our guide to vitamin D and omega-3.
Magnesium supports the nervous system and sleep. In a randomized trial of 126 adults with mild to moderate low mood, six weeks of magnesium improved mood and anxiety scores, with effects seen within two weeks (Tarleton et al., 2017). It was an open-label study without a placebo, so it needs confirming, but magnesium is inexpensive, safe at normal doses and helpful for sleep, which often suffers in winter.
B vitamins, especially B6, B12 and folate, help your body make the brain chemicals involved in mood and turn food into energy. They’re most helpful if your diet is limited or your levels are low. Active (“methylated”) forms are ready for your body to use. Learn more in what B vitamins are good for mood.
Rhodiola is an adaptogenic herb traditionally used in the long, dark winters of Scandinavia and Russia. In a small randomized trial of people with mild to moderate low mood, six weeks of rhodiola extract improved mood compared with placebo (Darbinyan et al., 2007), and another trial found it reduced stress-related fatigue (Olsson et al., 2009). Compare it in rhodiola vs ashwagandha.
| Supplement | What it does in winter | Evidence for mood |
|---|---|---|
| Vitamin D | Replaces what winter sun can’t make | Mixed; most useful if you’re low |
| Omega-3 | Supports brain cell membranes | Moderate (meta-analysis of 36 trials) |
| Magnesium | Calm, sleep, nervous system | Early but promising |
| B vitamins | Energy and neurotransmitter production | Helpful if levels are low |
| Rhodiola | Stress resilience and fatigue | Early (small trials) |
| Bright light therapy | Resets your body clock | Strongest (not a supplement) |
If you decide to try supplements this winter, here’s what to look for:
We built the Holitro Sunshine Pack around the research above. Each daily tear-away pouch contains:
$98.95 a month, about $3.30 a day. 30 pouches delivered monthly, free US shipping, pause or cancel any time from your account, and a 30-day money-back guarantee on your first box.
Contains 5,000 IU of vitamin D3 per pouch. If you already take vitamin D, or another pack with vitamin D (the Immune Pack and Seasonal Support Pack include it), check with your doctor before combining them. If you take medication for mood, are pregnant or nursing, talk to your doctor first. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
A good fit if you: live north of about 35°N and spend most daylight hours indoors; feel flat, tired or unmotivated from October to March; eat little oily fish; or want one simple routine instead of five bottles.
Not the right choice if you: already take a high-dose vitamin D supplement or another vitamin D-containing pack; take antidepressants or other mood medication without your doctor’s OK (rhodiola can interact); take blood thinners (omega-3); have bipolar disorder; or have symptoms that need medical care. If stress rather than winter is your main issue, the Mood Support Pack or Stress Pack may suit you better.
Vitamin D and omega-3 are the most studied. Vitamin D replaces what winter sunlight can’t provide, and omega-3 has the most consistent evidence for mood. Magnesium, B vitamins and rhodiola may also help. For diagnosed seasonal affective disorder, light therapy and medical care come first.
The US recommended intake is 600 to 800 IU a day, and many adults take 1,000 to 4,000 IU in winter. The upper limit for adults without medical supervision is 4,000 IU a day. Higher doses, like the 5,000 IU in the Sunshine Pack, are often used to restore low levels, so ask your doctor to check your levels, especially if you take other vitamin D.
It helps keep your levels up when the sun can’t, which matters for overall health. But large trials haven’t shown vitamin D alone prevents low mood in people who aren’t deficient. It works best as part of a wider routine with light, exercise and omega-3.
Early autumn is ideal, around October, since vitamin D levels start falling then and omega-3 benefits build over eight weeks or more. Many people continue through March or April.
Talk to your doctor first. Rhodiola may interact with antidepressants, and omega-3 can add to the effect of blood thinners. Vitamin D, magnesium and B vitamins are generally compatible, but your doctor should know everything you take.
The best vitamins for seasonal depression and the winter blues are vitamin D, to fill the gap winter sunlight leaves, and omega-3, which has the most consistent evidence for mood, supported by magnesium, B vitamins and rhodiola. None of them replaces light, movement and sleep, and seasonal affective disorder needs proper medical care. But as part of a winter routine started early and taken consistently, they can help you feel more like yourself until spring.
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